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Subject: Microarray analysis identifies a death-from-cancer signature predicting therapy failure in patients with multiple types of cancer -- Glinsky et al. 115 (6): 1503 -- Journal of Clinical Investigation
Date: Fri, 17 Nov 2006 16:36:44 +0100
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BODY></TABLE><FONT=20
      size=3D-1><BR><I>J. Clin. Invest.</I> <B>115</B>:1503-1521 (2005). =

      doi:10.1172/JCI23412.<BR>Copyright =A92005 by the American Society =
for=20
      Clinical Investigation </FONT><BR>
      <TABLE cellSpacing=3D0 cellPadding=3D0>
        <TBODY>
        <TR>
          <TD>
            <HR noShade SIZE=3D1>

            <H3><FONT face=3Darial,helvetica>Research=20
        Articles</FONT></H3></TD></TR></TBODY></TABLE>
      <H2>Microarray analysis identifies a death-from-cancer signature=20
      predicting therapy failure in patients with multiple types of =
cancer=20
      </H2><FONT face=3Darial,helvetica></NOBR><NOBR>Gennadi V. =
Glinsky</NOBR>,=20
      <NOBR>Olga Berezovska</NOBR> and <NOBR>Anna B. Glinskii</NOBR> =
</FONT>
      <P><FONT size=3D-1>Sidney Kimmel Cancer Center, San Diego, =
California, USA.=20
      </FONT>
      <P><FONT face=3Darial,helvetica size=3D-1><B>Address =
correspondence to:</B>=20
      Gennadi V. Glinsky, Sidney Kimmel Cancer Center, 10835 Altman Row, =
San=20
      Diego, California 92121, USA. Phone: (858) 450-5990; Fax: (858) =
623-2740;=20
      E-mail: <SPAN id=3Dem0>gglinsky{at}skcc.org</SPAN>
      <SCRIPT type=3Dtext/javascript><!--=0A=
 var u =3D "gglinsky", d =3D "skcc.org"; =
document.getElementById("em0").innerHTML =3D '<a href=3D"mailto:' + u + =
'@' + d + '">' + u + '@' + d + '<\/a>'//--></SCRIPT>
      .</FONT>
      <P><FONT size=3D-1>Received for publication September 21, =
2004</FONT><FONT=20
      size=3D-1>, and accepted in revised form March 1, 2005.</FONT>
      <P><A name=3DABS><!-- null --></A><BR clear=3Dright>
      <TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" =
bgColor=3D#e1e1e1>
        <TBODY>
        <TR>
          <TD vAlign=3Dcenter align=3Dleft width=3D"5%" =
bgColor=3D#ffffff><IMG=20
            height=3D21 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/rarrow.gif" =
width=3D10></TD>
          <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
            Abstract </FONT></TH></TR></TBODY></TABLE>
      <TABLE cellPadding=3D5 align=3Dright border=3D1>
        <TBODY>
        <TR>
          <TH align=3Dleft><FONT size=3D-1><A=20
            =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#top"><IMG=20
            height=3D9 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/uarrow.gif" width=3D11=20
            border=3D0>Top<BR></A><IMG height=3D9 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/dot.gif" width=3D11 =
border=3D0><FONT=20
            color=3D#464c53>Abstract</FONT><BR><A=20
            =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#SEC1"><IMG=20
            height=3D9 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/darrow.gif" width=3D11=20
            border=3D0>Introduction<BR></A><A=20
            =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#SEC2"><IMG=20
            height=3D9 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/darrow.gif" width=3D11=20
            border=3D0>Results<BR></A><A=20
            =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#SEC3"><IMG=20
            height=3D9 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/darrow.gif" width=3D11=20
            border=3D0>Discussion<BR></A><A=20
            =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#SEC4"><IMG=20
            height=3D9 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/darrow.gif" width=3D11=20
            border=3D0>Methods<BR></A><A=20
            =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#BIBL"><IMG=20
            height=3D9 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/darrow.gif" width=3D11=20
            =
border=3D0>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>A=
ctivation=20
      in transformed cells of normal stem cells=92<SUP> =
</SUP>self-renewal=20
      pathways might contribute to the survival life<SUP> </SUP>cycle of =
cancer=20
      stem cells and promote tumor progression. The<SUP> =
</SUP><I>BMI-1</I>=20
      oncogene=96driven gene expression pathway is essential<SUP> =
</SUP>for the=20
      self-renewal of hematopoietic and neural stem cells.<SUP> </SUP>We =
applied=20
      a mouse/human comparative translational genomics<SUP> =
</SUP>approach to=20
      identify an 11-gene signature that consistently<SUP> =
</SUP>displays a stem=20
      cell=96resembling expression profile in<SUP> </SUP>distant =
metastatic=20
      lesions as revealed by the analysis of metastases<SUP> </SUP>and =
primary=20
      tumors from a transgenic mouse model of prostate<SUP> </SUP>cancer =
and=20
      cancer patients. To further validate these results,<SUP> </SUP>we =
examined=20
      the prognostic power of the 11-gene signature in<SUP> =
</SUP>several=20
      independent therapy-outcome sets of clinical samples<SUP> =
</SUP>obtained=20
      from 1,153 cancer patients diagnosed with 11 different<SUP> =
</SUP>types of=20
      cancer, including 5 epithelial malignancies (prostate,<SUP> =
</SUP>breast,=20
      lung, ovarian, and bladder cancers) and 5 nonepithelial<SUP>=20
      </SUP>malignancies (lymphoma, mesothelioma, medulloblastoma, =
glioma,<SUP>=20
      </SUP>and acute myeloid leukemia). Kaplan-Meier analysis =
demonstrated<SUP>=20
      </SUP>that a stem cell=96like expression profile of the =
11-gene<SUP>=20
      </SUP>signature in primary tumors is a consistent powerful =
predictor<SUP>=20
      </SUP>of a short interval to disease recurrence, distant =
metastasis,<SUP>=20
      </SUP>and death after therapy in cancer patients diagnosed with =
11<SUP>=20
      </SUP>distinct types of cancer. These data suggest the presence =
of<SUP>=20
      </SUP>a conserved BMI-1=96driven pathway, which is similarly =
engaged<SUP>=20
      </SUP>in both normal stem cells and a highly malignant subset of=20
      human<SUP> </SUP>cancers diagnosed in a wide range of organs and =
uniformly=20
      exhibiting<SUP> </SUP>a marked propensity toward metastatic =
dissemination=20
      as well<SUP> </SUP>as a high probability of unfavorable therapy=20
      outcome.<SUP> </SUP>
      <P><A=20
      =
href=3D"http://www.jci.org/cgi/lookup?lookupType=3Dvolpage&amp;vol=3D115&=
amp;fp=3D1463&amp;view=3Dshort">See=20
      the related Commentary beginning on page 1463</A><SUP> </SUP>
      <P><A name=3DSEC1><!-- null --></A><BR clear=3Dright>
      <TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" =
bgColor=3D#e1e1e1>
        <TBODY>
        <TR>
          <TD vAlign=3Dcenter align=3Dleft width=3D"5%" =
bgColor=3D#ffffff><IMG=20
            height=3D21 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/rarrow.gif" =
width=3D10></TD>
          <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
            Introduction </FONT></TH></TR></TBODY></TABLE>
      <TABLE cellPadding=3D5 align=3Dright border=3D1>
        <TBODY>
        <TR>
          <TH align=3Dleft><FONT size=3D-1><A=20
            =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#top"><IMG=20
            height=3D9 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/uarrow.gif" width=3D11=20
            border=3D0>Top<BR></A><A=20
            =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#ABS"><IMG=20
            height=3D9 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/uarrow.gif" width=3D11=20
            border=3D0>Abstract<BR></A><IMG height=3D9 alt=3D" " =
hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/dot.gif" width=3D11 =
border=3D0><FONT=20
            color=3D#464c53>Introduction</FONT><BR><A=20
            =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#SEC2"><IMG=20
            height=3D9 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/darrow.gif" width=3D11=20
            border=3D0>Results<BR></A><A=20
            =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#SEC3"><IMG=20
            height=3D9 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/darrow.gif" width=3D11=20
            border=3D0>Discussion<BR></A><A=20
            =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#SEC4"><IMG=20
            height=3D9 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/darrow.gif" width=3D11=20
            border=3D0>Methods<BR></A><A=20
            =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#BIBL"><IMG=20
            height=3D9 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/darrow.gif" width=3D11=20
            =
border=3D0>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>R=
ecent=20
      studies indicate that the <I>Polycomb group</I> (PcG) gene=20
      <I>Bmi-1</I><SUP> </SUP>determines the proliferative potential of =
normal=20
      and leukemic<SUP> </SUP>stem cells (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B1">1</A>)=20
      and is required for the self-renewal of hematopoietic<SUP> =
</SUP>and=20
      neural stem cells (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B1">1</A>-<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B3">3</A>).=20
      Self-renewal ability is an essential<SUP> </SUP>defining property =
of a=20
      pluripotent stem cell=96like phenotype<SUP> </SUP>distinguishing =
stem cells=20
      from other cell types (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B4">4</A>).=20
      An emerging<SUP> </SUP>concept of "tumor stem cells" argues that =
the=20
      presence of a<SUP> </SUP>rare stem cell=96resembling population of =
cancer=20
      cells among<SUP> </SUP>the heterogeneous mix of cells constituting =
a tumor=20
      is essential<SUP> </SUP>for tumor progression and metastasis of =
epithelial=20
      malignancies<SUP> </SUP>(<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B5">5</A>-<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B7">7</A>).=20
      The concept of tumor stem cells implies that common genetic<SUP>=20
      </SUP>pathways might define critical stem cell=96like =
functions<SUP>=20
      </SUP>in both normal and neoplastic stem cells (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B1">1</A>,=20
      <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B5">5</A>).=20
      <I>Bmi-1</I> oncogene<SUP> </SUP>is expressed in all primary =
myeloid=20
      leukemia and leukemic cell<SUP> </SUP>lines analyzed so far (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B1">1</A>,=20
      <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B8">8</A>),=20
      and overexpression of <I>Bmi-1</I> causes<SUP> </SUP>neoplastic=20
      transformation of lymphocytes (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B9">9</A>,=20
      <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B10">10</A>).=20
      Recently,<SUP> </SUP><I>BMI-1</I> expression was reported in human =

      non-small-cell lung cancer<SUP> </SUP>(<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B11">11</A>)=20
      and breast cancer cell lines (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B12">12</A>);=20
      this suggests an oncogenic<SUP> </SUP>role for <I>BMI-1</I> =
activation in=20
      epithelial malignancies.<SUP> </SUP>
      <P>Expression profiling of prostate tumor samples using=20
      oligonucleotide<SUP> </SUP>or cDNA microarray technology rapidly =
emerged=20
      as a powerful<SUP> </SUP>tool to reveal multiple gene expression=20
      signatures associated<SUP> </SUP>with human prostate cancer (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B13">13</A>-<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B27">27</A>),=20
      including potential prostate<SUP> </SUP>cancer prognosis markers =
(<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B14">14</A>,=20
      <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B15">15</A>,=20
      <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B18">18</A>,=20
      <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B24">24</A>-<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B26">26</A>).=20
      However, one of<SUP> </SUP>the major limitations of these studies =
was that=20
      the same clinical<SUP> </SUP>data set was used for both signature=20
      discovery and validation.<SUP> </SUP>Furthermore, microarray =
analysis=20
      typically identifies vast data<SUP> </SUP>sets of candidate =
markers, and=20
      usually only a single hit or<SUP> </SUP>a few hits were validated =
using=20
      independent methods and independent<SUP> </SUP>clinical data sets; =
this=20
      diminished the potential advantage<SUP> </SUP>of the use of a =
panel of=20
      markers over a single marker in diagnostic<SUP> </SUP>and/or =
prognostic=20
      applications. Recently we attempted to address<SUP> </SUP>some of =
these=20
      limitations by using microarray-based gene expression<SUP> =
</SUP>profiling=20
      to identify molecular signatures that comprise small<SUP> =
</SUP>clusters=20
      of coregulated transcripts and distinguish subgroups<SUP> </SUP>of =

      prostate cancer patients with differing outcomes after =
therapy<SUP>=20
      </SUP>(<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B15">15</A>).=20
      In these experiments for signature discovery and validation,<SUP> =
</SUP>we=20
      used 2 independent cohorts of prostate cancer patients (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B15">15</A>).<SUP>=20
      </SUP>The proposed prostate cancer prognosis predictor algorithm =
uses<SUP>=20
      </SUP>a panel of 3 molecular signatures and appears to =
demonstrate<SUP>=20
      </SUP>high discrimination accuracy between subgroups of patients =
with<SUP>=20
      </SUP>distinct clinical outcome after therapy, providing =
additional<SUP>=20
      </SUP>predictive value over conventional markers of outcome (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B15">15</A>).<SUP>=20
      </SUP>
      <P>Most recently, the global gene expression profiling =
approach<SUP>=20
      </SUP>was successfully used to identify molecular signatures=20
      associated<SUP> </SUP>with activation of oncogenic pathways (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B28">28</A>),=20
      targeted genetic<SUP> </SUP>manipulations (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B29">29</A>),=20
      and cellular responses to physiological<SUP> </SUP>stimuli (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B30">30</A>)=20
      and to build robust transcriptional identifiers<SUP> </SUP>that =
reliably=20
      recognize the engagement of corresponding pathways<SUP> =
</SUP>within the=20
      highly complex patterns of gene expression in experimental<SUP> =
</SUP>and=20
      clinical samples.<SUP> </SUP>
      <P>We hypothesized that molecular signatures associated with=20
      activation<SUP> </SUP>of a normal stem cell=92s self-renewal =
program in=20
      metastatic<SUP> </SUP>cancer cells might be detectable by =
searching for=20
      genes exhibiting<SUP> </SUP>concordant patterns of regulation in=20
      metastatic lesions and<SUP> </SUP>normal stem cells in=20
      <I>Bmi-1<SUP>+/+</SUP></I> versus <I>Bmi-1<SUP>=96/=96</SUP></I> =
genetic<SUP>=20
      </SUP>backgrounds. Here we report that the expression of =
<I>Bmi-1</I>=20
      is<SUP> </SUP>elevated and a stem cell=96like =
<I>BMI-1</I>=96associated=20
      gene<SUP> </SUP>expression pathway is activated in metastatic =
prostate=20
      tumors.<SUP> </SUP>We provide evidence that the stem =
cell=96resembling=20
      expression<SUP> </SUP>profile of the 11-gene signature in primary =
prostate=20
      tumors<SUP> </SUP>predicts therapy failure in prostate cancer =
patients. We=20
      show<SUP> </SUP>that expression of the 11-gene signature is a =
powerful=20
      predictor<SUP> </SUP>of a short interval to distant metastasis and =
poor=20
      survival<SUP> </SUP>after therapy in breast and lung cancer =
patients=20
      diagnosed with<SUP> </SUP>an early-stage disease. Finally, we =
extend our=20
      therapy-outcome<SUP> </SUP>analysis to include 1,153 cancer =
patients=20
      diagnosed with 11<SUP> </SUP>different cancer types and =
demonstrate that=20
      prognostic power<SUP> </SUP>of the 11-gene signature is =
informative in all=20
      11 different<SUP> </SUP>types of human cancer diagnosed in =
multiple=20
      organs.<SUP> </SUP>
      <P><A name=3DSEC2><!-- null --></A><BR clear=3Dright>
      <TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" =
bgColor=3D#e1e1e1>
        <TBODY>
        <TR>
          <TD vAlign=3Dcenter align=3Dleft width=3D"5%" =
bgColor=3D#ffffff><IMG=20
            height=3D21 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/rarrow.gif" =
width=3D10></TD>
          <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
            Results </FONT></TH></TR></TBODY></TABLE>
      <TABLE cellPadding=3D5 align=3Dright border=3D1>
        <TBODY>
        <TR>
          <TH align=3Dleft><FONT size=3D-1><A=20
            =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#top"><IMG=20
            height=3D9 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/uarrow.gif" width=3D11=20
            border=3D0>Top<BR></A><A=20
            =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#ABS"><IMG=20
            height=3D9 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/uarrow.gif" width=3D11=20
            border=3D0>Abstract<BR></A><A=20
            =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#SEC1"><IMG=20
            height=3D9 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/uarrow.gif" width=3D11=20
            border=3D0>Introduction<BR></A><IMG height=3D9 alt=3D" " =
hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/dot.gif" width=3D11 =
border=3D0><FONT=20
            color=3D#464c53>Results</FONT><BR><A=20
            =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#SEC3"><IMG=20
            height=3D9 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/darrow.gif" width=3D11=20
            border=3D0>Discussion<BR></A><A=20
            =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#SEC4"><IMG=20
            height=3D9 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/darrow.gif" width=3D11=20
            border=3D0>Methods<BR></A><A=20
            =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#BIBL"><IMG=20
            height=3D9 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/darrow.gif" width=3D11=20
            =
border=3D0>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR><=
FONT=20
      size=3D-1><STRONG>BMI-1 oncogene expression is elevated in =
prostate=20
      cancer.</STRONG></FONT><BR>Recent experimental observations =
documented an=20
      increased <I>Bmi-1</I><SUP> </SUP>expression in human =
non-small-cell lung=20
      cancer (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B11">11</A>),=20
      human breast<SUP> </SUP>carcinomas (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B31">31</A>),=20
      and established breast cancer cell lines (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B12">12</A>),<SUP>=20
      </SUP>suggesting that an oncogenic role of <I>Bmi-1</I> activation =
may=20
      be<SUP> </SUP>extended beyond leukemia and, perhaps, may affect=20
      progression<SUP> </SUP>of the epithelial malignancies as well. =
Microarray=20
      gene expression<SUP> </SUP>analysis of established cancer cell =
lines=20
      representing multiple<SUP> </SUP>experimental models of human =
prostate=20
      cancer (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B16">16</A>)=20
      revealed that<SUP> </SUP><I>BMI-1</I> expression seems to be =
consistently=20
      elevated in human<SUP> </SUP>prostate cancer cell lines compared =
with the=20
      primary cultures<SUP> </SUP>of normal human prostate epithelial =
cells=20
      (Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F1">1</A>,=20
      A and B).<SUP> </SUP>To validate the results of the microarray=20
      experiments, we confirmed<SUP> </SUP>these observations using =
quantitative=20
      RT-PCR (Q-RT-PCR) analysis<SUP> </SUP>of <I>BMI-1</I> mRNA =
expression=20
      (Table <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#T1">1</A>;=20
      and see Supplemental Figure<SUP> </SUP>1; supplemental material =
available=20
      online with this article;<SUP> </SUP>doi:10.1172/JCI23412DS1). =
Thus,=20
      results of expression profiling<SUP> </SUP>experiments appear to =
support=20
      the notion that transcriptional<SUP> </SUP>activation of the =
<I>BMI-1</I>=20
      gene is frequently associated with human<SUP> </SUP>prostate =
cancer.<SUP>=20
      </SUP>
      <P><A name=3DF1><!-- null --></A><BR clear=3Dall>
      <CENTER>
      <TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD>
            <TABLE cellSpacing=3D2 cellPadding=3D2>
              <TBODY>
              <TR bgColor=3D#e1e1e1>
                <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
                  =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503/F1"><IMG=20
                  height=3D173 alt=3D" " hspace=3D10=20
                  =
src=3D"http://www.jci.org/content/vol115/issue6/images/small/JCI0523412.f=
1.gif"=20
                  width=3D200 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
                  version</STRONG> (56K):<BR><NOBR><A=20
                  =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503/F1">[in=20
                  this window]</A><BR><A=20
                  onmouseover=3D"window.status=3D'View figure in a =
separate window'; return true"=20
                  onclick=3D"startTarget('F1', 590, 580); =
this.href=3D'/cgi/content-nw/full/115/6/1503/F1'"=20
                  =
href=3D"http://www.jci.org/cgi/content-nw/full/115/6/1503/F1"=20
                  target=3DF1>[in a new window]</A><BR>&nbsp;</NOBR> =
</TD>
                <TD vAlign=3Dtop align=3Dleft><STRONG><B>Figure 1</B>=20
                  </STRONG><SUP></SUP><BR>Microarray =
(<B>A</B>=96<B>D</B>) and=20
                  RT-PCR (<B>E</B>) analyses reveal increased expression =
of=20
                  BMI-1 mRNA in multiple human prostate cancer cell =
lines=20
                  established from metastatic tumors (PC-3, LNCap, =
DuCap, VCap,=20
                  etc.) compared with normal human prostate epithelial =
cells=20
                  (NPEC) (<B>A</B> and <B>E</B>); in xenograft-derived =
human=20
                  prostate cancer cell line variants (PC-3M, PC-3MLN4,=20
                  PC-3MPro4) compared with the plastic-maintained =
parental cells=20
                  (PC-3) (<B>B</B>); in highly metastatic human prostate =

                  carcinoma xenografts (PC-3MLN4) compared with the less =

                  metastatic parental counterparts (PC-3) growing =
orthotopically=20
                  in nude mice (<B>C</B>); in lymph node metastases of =
human=20
                  prostate cancer growing in the prostate of nude mice =
(MET)=20
                  (<B>C</B>); and in invasive primary prostate tumors =
and=20
                  distant metastatic lesions in the TRAMP transgenic =
mouse model=20
                  of prostate cancer (<B>D</B>). Prostate tissues from=20
                  age-matched wild-type C57BL/6 mice served as control =
samples=20
                  in Figure <A=20
                  =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F1">1</A>D.=20
                  The numbers 4, 5, and 7 indicate the age of TRAMP mice =
(in=20
                  months). Each sample represents a pool of tissues from =
3=965=20
                  mice. P values were obtained using a 2-tailed t test. =
LN3,=20
                  LNCapLN3; LN4, PC-3MLN4; PRO4, PC-3MPRO4; PRO5, =
LNCapPRO5; SV,=20
                  seminal vesicles; X, human xenograft tumors in nude =
mice.
                  =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR><A=20
      name=3DT1><!-- null --></A><BR clear=3Dall>
      <CENTER>
      <TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD>
            <TABLE cellSpacing=3D2 cellPadding=3D2>
              <TBODY>
              <TR bgColor=3D#e1e1e1>
                <TD vAlign=3Dtop align=3Dmiddle =
bgColor=3D#ffffff><STRONG>View this=20
                  table:</STRONG><BR><NOBR><A=20
                  =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503/T1">[in=20
                  this window]</A><BR><A=20
                  onmouseover=3D"window.status=3D'View table in a =
separate window'; return true"=20
                  onclick=3D"startTarget('T1', 590, 575); =
this.href=3D'/cgi/content-nw/full/115/6/1503/T1'"=20
                  =
href=3D"http://www.jci.org/cgi/content-nw/full/115/6/1503/T1"=20
                  target=3DT1>[in a new window]</A><BR>&nbsp;</NOBR> =
</TD>
                <TD vAlign=3Dtop align=3Dleft><STRONG><B>Table 1</B>=20
                  </STRONG><SUP></SUP><BR>Q-RT-PCR analysis of BMI-1 =
mRNA=20
                  expression in human prostate carcinoma cell lines
                  =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR>Interestingly,=20
      microarray analysis shows markedly higher <I>BMI-1</I><SUP>=20
      </SUP>expression levels in lymph node metastases and highly=20
      metastatic<SUP> </SUP>orthotopic xenografts of human prostate =
carcinoma in=20
      nude mice<SUP> </SUP>compared with the less metastatic =
counterparts=20
      (Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F1">1</A>C),<SUP>=20
      </SUP>implying that BMI-1 activation might be associated with=20
      aggressive<SUP> </SUP>malignant behavior of prostate carcinoma =
cells. To=20
      test this<SUP> </SUP>hypothesis, we carried out expression =
profiling=20
      analysis of<SUP> </SUP>approximately 12,000 transcripts in a =
transgenic=20
      mouse model<SUP> </SUP>of metastatic prostate cancer (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B32">32</A>).=20
      Microarray experiments detected<SUP> </SUP>increased levels of=20
      <I>Bmi-1</I> mRNA expression in late-stage invasive<SUP> =
</SUP>primary=20
      tumors and multiple distant metastatic lesions in the<SUP> =
</SUP>TRAMP=20
      transgenic mouse model of prostate cancer (Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F1">1</A>D),<SUP>=20
      </SUP>thus lending more credence to the idea that activation of =
a<SUP>=20
      </SUP>BMI-1=96associated pathway is linked with prostate =
cancer<SUP>=20
      </SUP>metastasis. It should be pointed out that despite the=20
      apparently<SUP> </SUP>consistent pattern of increased <I>Bmi-1</I> =

      expression in prostate<SUP> </SUP>cancer, there is considerable=20
      variability in the degree of elevation<SUP> </SUP>of <I>Bmi-1</I>=20
      expression at the distinct sites of malignant growth<SUP> </SUP>in =
vivo=20
      (Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F1">1</A>D).=20
      We carried out the Q-RT-PCR analysis of<SUP> </SUP><I>Bmi-1</I> =
mRNA=20
      expression in 4 additional late-stage invasive primary<SUP> =
</SUP>prostate=20
      tumors of the 6- to 7-month old TRAMP mice and confirmed<SUP> =
</SUP>the 2-=20
      to 8-fold increase in <I>Bmi-1</I> expression in all 4 tumors<SUP> =

      </SUP>(data not shown).<SUP> </SUP>
      <P><FONT size=3D-1><STRONG>Identification of a BMI-1=96pathway =
signature with=20
      concordant expression profiles in normal stem cells and distant =
metastatic=20
      lesions in a transgenic mouse model of prostate=20
      cancer.</STRONG></FONT><BR>Recent experiments established that the =

      <I>Bmi-1</I> gene is required<SUP> </SUP>for self-renewal of =
hematopoietic=20
      and neural stem cells (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B1">1</A>-<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B3">3</A>)<SUP>=20
      </SUP>and identified BMI-1=96regulated genes in neural stem =
cells<SUP>=20
      </SUP>that are presumably engaged in an execution of =
self-renewal<SUP>=20
      </SUP>programs in a state of both central nervous system (CNS) =
and<SUP>=20
      </SUP>peripheral nervous system (PNS) neurospheres (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B3">3</A>).=20
      We hypothesized<SUP> </SUP>that molecular signatures associated =
with=20
      activation of a normal-stem<SUP> </SUP>cell=92s self-renewal =
program in=20
      metastatic cancer cells<SUP> </SUP>might be detectable by looking =
for=20
      genes manifesting concordant<SUP> </SUP>patterns of regulation in=20
      metastasis and normal stem cells in<SUP> =
</SUP><I>Bmi-1<SUP>+/+</SUP></I>=20
      versus <I>Bmi-1<SUP>=96/=96</SUP></I> genetic backgrounds. =
Therefore,<SUP>=20
      </SUP>we set out to determine whether expression profiles of=20
      transcripts<SUP> </SUP>activated and suppressed in prostate cancer =

      metastases would<SUP> </SUP>recapitulate the expression profile of =
the=20
      BMI-1=96regulated<SUP> </SUP>genes in normal stem cells, by =
comparing the=20
      sets of differentially<SUP> </SUP>regulated genes in search of=20
      intersection of lists for both<SUP> </SUP>up- and downregulated=20
      transcripts (see Figures <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F2">2</A>=20
      and <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F3">3</A>,=20
      Methods,<SUP> </SUP>and supplemental material for description of a =

      signature discovery<SUP> </SUP>protocol). This analysis identified =
genes=20
      exhibiting highly<SUP> </SUP>concordant profiles of =
transcript-abundance=20
      behavior in prostate<SUP> </SUP>cancer metastases and=20
      <I>Bmi-1<SUP>+/+</SUP></I> versus <I>Bmi-1<SUP>=96/=96</SUP></I> =
PNS<SUP>=20
      </SUP>neurospheres, suggesting the presence of a conserved=20
      <I>BMI-1</I>=96regulated<SUP> </SUP>pathway(s) similarly engaged =
in both=20
      normal stem cells and distant<SUP> </SUP>metastatic lesions of =
prostate=20
      carcinoma (Figures <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F2">2</A>=20
      and <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F3">3</A>).<SUP>=20
      </SUP>
      <P><A name=3DF2><!-- null --></A><BR clear=3Dall>
      <CENTER>
      <TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD>
            <TABLE cellSpacing=3D2 cellPadding=3D2>
              <TBODY>
              <TR bgColor=3D#e1e1e1>
                <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
                  =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503/F2"><IMG=20
                  height=3D126 alt=3D" " hspace=3D10=20
                  =
src=3D"http://www.jci.org/content/vol115/issue6/images/small/JCI0523412.f=
2.gif"=20
                  width=3D200 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
                  version</STRONG> (27K):<BR><NOBR><A=20
                  =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503/F2">[in=20
                  this window]</A><BR><A=20
                  onmouseover=3D"window.status=3D'View figure in a =
separate window'; return true"=20
                  onclick=3D"startTarget('F2', 590, 478); =
this.href=3D'/cgi/content-nw/full/115/6/1503/F2'"=20
                  =
href=3D"http://www.jci.org/cgi/content-nw/full/115/6/1503/F2"=20
                  target=3DF2>[in a new window]</A><BR>&nbsp;</NOBR> =
</TD>
                <TD vAlign=3Dtop align=3Dleft><STRONG><B>Figure 2</B>=20
                  </STRONG><SUP></SUP><BR>Distant metastatic lesions in =
the=20
                  TRAMP transgenic mouse model of prostate cancer =
exhibit stem=20
                  cell=96like expression signatures of the BMI-1 =
pathway.=20
                  Transcripts differentially regulated in distant =
metastatic=20
                  lesions of 6-month-old TRAMP mice (MTTS signature) =
were=20
                  compared with the BMI-1=96regulated genes in neural =
stem cells=20
                  (<A=20
                  =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B3">3</A>)=20
                  in search of intersection of lists. (<B>A</B>) =
Expression=20
                  profiles and the corresponding Pearson correlation =
coefficient=20
                  for 199 genes (141 upregulated and 58 downregulated)=20
                  comprising concordant differentially regulated sets of =

                  transcripts in metastatic TRAMP samples and PNS =
neurospheres=20
                  are shown. Small gene expression signatures comprising =

                  transcripts with a high level of expression =
correlation in=20
                  metastatic cancer cells and stem cells (the selection=20
                  threshold for small signatures was arbitrarily set at =
Pearson=20
                  correlation coefficients greater than 0.95) were =
selected from=20
                  large concordant sets. The reduction in the signature=20
                  transcript number was terminated when further =
elimination of a=20
                  transcript did not increase the value of the Pearson=20
                  correlation coefficient. Using this approach, a single =

                  candidate prognostic gene expression signature was =
selected=20
                  for each binary intersection of the MTTS signature and =
parent=20
                  stem cell signatures (Figure <A=20
                  =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F3">3</A>).=20
                  Consecutive steps of selection from the 199-gene =
concordant=20
                  set of a subset of 20 genes (<B>A</B> and <B>B</B>) =
and a=20
                  small MTTS/PNS 11-gene signature (<B>C</B> and =
<B>D</B>) are=20
                  shown. In <B>D</B>, r =3D 0.9897, P &lt; 0.0001 =
between gene=20
                  groups, and n =3D 11 per group. Complete lists of =
genes and=20
                  corresponding concordant subsets are shown in =
Supplemental=20
                  Table 2. See text, Figure <A=20
                  =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F3">3</A>,=20
                  and Table <A=20
                  =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#T3">3</A>=20
                  for details.
                  =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR><A=20
      name=3DF3><!-- null --></A><BR clear=3Dall>
      <CENTER>
      <TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD>
            <TABLE cellSpacing=3D2 cellPadding=3D2>
              <TBODY>
              <TR bgColor=3D#e1e1e1>
                <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
                  =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503/F3"><IMG=20
                  height=3D175 alt=3D" " hspace=3D10=20
                  =
src=3D"http://www.jci.org/content/vol115/issue6/images/small/JCI0523412.f=
3.gif"=20
                  width=3D200 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
                  version</STRONG> (35K):<BR><NOBR><A=20
                  =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503/F3">[in=20
                  this window]</A><BR><A=20
                  onmouseover=3D"window.status=3D'View figure in a =
separate window'; return true"=20
                  onclick=3D"startTarget('F3', 590, 585); =
this.href=3D'/cgi/content-nw/full/115/6/1503/F3'"=20
                  =
href=3D"http://www.jci.org/cgi/content-nw/full/115/6/1503/F3"=20
                  target=3DF3>[in a new window]</A><BR>&nbsp;</NOBR> =
</TD>
                <TD vAlign=3Dtop align=3Dleft><STRONG><B>Figure 3</B>=20
                  </STRONG><SUP></SUP><BR>Sequential analytical steps =
used for=20
                  identification, selection, and validation of the =
11-gene=20
                  death-from-cancer signature. The figure shows an =
overview of=20
                  the approach used for the development and validation =
of a=20
                  cancer survival predictor based on gene expression =
monitoring.
                  =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR>The=20
      metastatic TRAMP tumor sample (MTTS) signature is likely<SUP> =
</SUP>to be=20
      enriched for genes discriminative for the metastatic =
phenotype.<SUP>=20
      </SUP>It is reasonable to assume that many gene expression =
patterns<SUP>=20
      </SUP>wired into the MTTS signature would manifest the power to=20
      discriminate<SUP> </SUP>the metastatic phenotype and would have no =

      relation to the transcriptional<SUP> </SUP>program of normal stem =
cells.=20
      We sought to use these features<SUP> </SUP>of the MTTS signature =
for=20
      identification of the gene expression<SUP> </SUP>components of a =
stem cell=20
      transcriptome that are coordinately<SUP> </SUP>expressed in =
metastatic=20
      cancer cells and might manifest discriminative<SUP> =
</SUP>diagnostic power=20
      for the malignant phenotype. Sets of differentially<SUP> =
</SUP>regulated=20
      transcripts were independently identified for distant<SUP>=20
      </SUP>metastatic lesions and primary prostate tumors versus=20
      age-matched<SUP> </SUP>control samples in a transgenic TRAMP mouse =
model=20
      of metastatic<SUP> </SUP>prostate cancer (MTTS signature) as well =
as PNS=20
      (PNS signature)<SUP> </SUP>and CNS (CNS signature) neurospheres in =

      <I>Bmi-1<SUP>+/+</SUP></I> versus =
<I>Bmi-1<SUP>=96/=96</SUP></I><SUP>=20
      </SUP>backgrounds. This analytical step defined 3 large parent=20
      signatures<SUP> </SUP>(Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F3">3</A>):=20
      MTTS signature comprising 868 upregulated and 477<SUP> =
</SUP>downregulated=20
      transcripts; PNS signature comprising 885 upregulated<SUP> =
</SUP>and 1,088=20
      downregulated transcripts; and CNS signature comprising<SUP> =
</SUP>769=20
      upregulated and 778 downregulated transcripts.<SUP> </SUP>
      <P>Next we intersected the MTSS signature with the stem cell=20
      signatures<SUP> </SUP>in the state of PNS and CNS neurospheres to =
identify=20
      concordant<SUP> </SUP>sets of genes and define the stem cell =
signatures=20
      embedded into<SUP> </SUP>MTSS signature (Figures <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F2">2</A>=20
      and <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F3">3</A>).=20
      Subsets of transcripts exhibiting<SUP> </SUP>concordant expression =
changes=20
      in MTTS (MTTS signature) as well<SUP> </SUP>as PNS (PNS signature) =
and CNS=20
      (CNS signature) neurospheres<SUP> </SUP>in =
<I>Bmi-1<SUP>+/+</SUP></I>=20
      versus <I>Bmi-1<SUP>=96/=96</SUP></I> backgrounds were =
identified.<SUP>=20
      </SUP>Thus, 2 concordant subsets of transcripts were identified=20
      corresponding<SUP> </SUP>to each binary comparison of metastatic =
TRAMP=20
      tumors and neural<SUP> </SUP>stem cell samples in a state of PNS =
and CNS=20
      neurospheres (141<SUP> </SUP>upregulated and 58 downregulated =
transcripts=20
      for PNS neurospheres<SUP> </SUP>[<I>r</I> =3D 0.7593; <I>P</I> =
&lt; 0.0001;=20
      Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F2">2</A>A]=20
      and 40 upregulated and<SUP> </SUP>24 downregulated transcripts for =
CNS=20
      neurospheres [<I>r</I> =3D 0.7679;<SUP> </SUP><I>P</I> &lt; =
0.0001]). A=20
      third concordant subset of 27 genes comprising<SUP> </SUP>15 =
upregulated=20
      and 12 downregulated transcripts was selected<SUP> </SUP>for =
intersection=20
      common to all 3 signatures (<I>r</I> =3D 0.8002; <I>P</I> =
&lt;<SUP>=20
      </SUP>0.0001).<SUP> </SUP>
      <P>This analysis also identified a stem cell=96like =
expression<SUP>=20
      </SUP>profile for transcripts coordinately expressed in =
metastatic<SUP>=20
      </SUP>cancer cells and normal stem cells, which can be used as a=20
      consistent<SUP> </SUP>reference standard to interrogate =
independent data=20
      sets for<SUP> </SUP>possible presence of a stem cell=96like =
expression=20
      signature<SUP> </SUP>(Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F2">2</A>).=20
      Practical considerations essential for future development<SUP> =
</SUP>of=20
      genetic diagnostic tests using an analytical platform most<SUP>=20
      </SUP>compatible with the state-of-the-art clinical laboratory=20
      practice<SUP> </SUP>prompted us to select from concordant gene =
sets small=20
      gene expression<SUP> </SUP>signatures comprising transcripts with =
a high=20
      level of expression<SUP> </SUP>correlation in metastatic cancer =
cells and=20
      stem cells (the selection<SUP> </SUP>threshold for small =
signatures was=20
      arbitrarily set at Pearson<SUP> </SUP>correlation coefficients =
greater=20
      than 0.95). The reduction in<SUP> </SUP>the signature transcript =
number=20
      was terminated when further<SUP> </SUP>elimination of a transcript =
did not=20
      increase the value of the<SUP> </SUP>Pearson correlation =
coefficient.=20
      Using this approach, a single<SUP> </SUP>candidate prognostic gene =

      expression signature was selected<SUP> </SUP>for each binary =
intersection=20
      of the MTTS signature and parent<SUP> </SUP>stem cell signatures =
(Figure=20
      <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F3">3</A>).=20
      Then small signatures (1 11-gene<SUP> </SUP>signature for the PNS =
set, 1=20
      11-gene signature for the CNS set,<SUP> </SUP>and one 14-gene =
signature=20
      for the common PNS/CNS set) were tested<SUP> </SUP>for the power =
to=20
      discriminate the metastatic phenotype (using<SUP> </SUP>1 mouse =
prostate=20
      cancer data set and 1 human prostate cancer<SUP> </SUP>data set =
comprising=20
      primary and metastatic tumors) and therapy-outcome<SUP>=20
      </SUP>classification performance (using human prostate cancer =
therapy<SUP>=20
      </SUP>outcome set 1). Based on diagnostic and prognostic=20
      classification<SUP> </SUP>performance, a single best-performing =
11-gene=20
      MTTS/PNS signature<SUP> </SUP>was selected for further validation =
analysis=20
      (Figures <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F3">3</A>=20
      and<SUP> </SUP><A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F4">4</A>).<SUP>=20
      </SUP>
      <P><A name=3DF4><!-- null --></A><BR clear=3Dall>
      <CENTER>
      <TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD>
            <TABLE cellSpacing=3D2 cellPadding=3D2>
              <TBODY>
              <TR bgColor=3D#e1e1e1>
                <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
                  =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503/F4"><IMG=20
                  height=3D183 alt=3D" " hspace=3D10=20
                  =
src=3D"http://www.jci.org/content/vol115/issue6/images/small/JCI0523412.f=
4.gif"=20
                  width=3D200 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
                  version</STRONG> (53K):<BR><NOBR><A=20
                  =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503/F4">[in=20
                  this window]</A><BR><A=20
                  onmouseover=3D"window.status=3D'View figure in a =
separate window'; return true"=20
                  onclick=3D"startTarget('F4', 590, 603); =
this.href=3D'/cgi/content-nw/full/115/6/1503/F4'"=20
                  =
href=3D"http://www.jci.org/cgi/content-nw/full/115/6/1503/F4"=20
                  target=3DF4>[in a new window]</A><BR>&nbsp;</NOBR> =
</TD>
                <TD vAlign=3Dtop align=3Dleft><STRONG><B>Figure 4</B>=20
                  </STRONG><SUP></SUP><BR>Selection of the =
best-performing small=20
                  signature based on evaluation of the=20
                  metastatic-phenotype-discrimination performance and=20
                  therapy-outcome prediction power of candidate =
prognostic=20
                  signatures. Expression profiles of the 3 small =
signatures=20
                  (11-gene MTTS/PNS signature, <B>A</B>=96<B>C</B>; =
11-gene=20
                  MTTS/CNS signature, <B>D</B>=96<B>F</B>; and 14-gene=20
                  MTTS/PNS/CNS signature, <B>G</B>=96<B>I</B>) were =
evaluated in=20
                  metastatic lesions at multiple distant target organs =
and=20
                  primary prostate carcinomas in the TRAMP transgenic =
mouse=20
                  model of prostate cancer (<B>A</B>, <B>D</B>, and =
<B>G</B>)=20
                  and prostate cancer patients (<B>B</B>, <B>E</B>, and=20
                  <B>H</B>) for presence of a stem cell=96like =
expression profile.=20
                  (<B>B</B>, <B>E</B>, and <B>H</B>) Data from the =
analysis of 9=20
                  distant metastatic lesions and 23 primary human =
prostate=20
                  carcinoma samples. (<B>C</B>, <B>F</B>, and <B>I</B>)=20
                  Kaplan-Meier analysis of the probability that patients =
would=20
                  remain disease-free among 21 prostate cancer patients=20
                  constituting clinical outcome set 1, according to =
whether they=20
                  had a good-prognosis or a poor-prognosis signature as =
defined=20
                  by the expression profiles of the small prognostic =
signatures.=20
                  The y axes in <B>A</B>, <B>B</B>, <B>D</B>, <B>E</B>,=20
                  <B>G</B>, and <B>H</B> show the SPAI values in =
corresponding=20
                  metastatic and primary tumor samples (see Methods for =
a=20
                  description of SPAI definition and calculation). CI,=20
                  confidence interval.
                  =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR>During=20
      the malignant-phenotype classification performance tests<SUP>=20
      </SUP>(Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F4">4</A>),=20
      we asked whether individual metastatic lesions and<SUP> =
</SUP>primary=20
      prostate tumors would exhibit a stem cell=96like<SUP> =
</SUP>expression=20
      profile of the candidate prognostic signatures. We<SUP> =
</SUP>selected for=20
      this analysis 3 small signatures demonstrating<SUP> </SUP>the most =

      significant correlation (Figures <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F2">2</A>=20
      and <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F3">3</A>)=20
      of expression<SUP> </SUP>profiles in stem cells and prostate =
cancer=20
      metastasis. To assess<SUP> </SUP>a degree of similarity of the =
signature=20
      expression profiles<SUP> </SUP>in individual tumor samples and =
normal stem=20
      cells, we calculated<SUP> </SUP>a Pearson correlation coefficient =
for each=20
      sample by comparing<SUP> </SUP>signature expression profile in an=20
      individual sample to the<SUP> </SUP>stem cell=96associated =
expression=20
      profile of the corresponding<SUP> </SUP>small signatures. Based on =

      expected similarity of the prognostic<SUP> </SUP>signatures in =
stem cells=20
      and prostate cancer metastasis, we<SUP> </SUP>named the =
corresponding=20
      Pearson correlation coefficients measured<SUP> </SUP>for =
individual=20
      samples the stem cell=96like phenotype association<SUP> =
</SUP>indices=20
      (SPAIs; see Methods for a description of definition<SUP> </SUP>and =

      measurement of SPAIs). As shown in Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F4">4</A>,=20
      A, D, and G,<SUP> </SUP>2 of 3 late-stage invasive primary tumors =
and all=20
      distant metastatic<SUP> </SUP>lesions in the TRAMP transgenic =
mouse model=20
      of prostate cancer<SUP> </SUP>have positive SPAIs, thus =
manifesting a stem=20
      cell=96like<SUP> </SUP>expression profile of the small =
signatures.<SUP>=20
      </SUP>
      <P><FONT size=3D-1><STRONG>Distant metastatic lesions and primary =
prostate=20
      tumors from cancer patients with differing therapy outcome display =

      distinct expression profiles of the 11-gene MTTS/PNS=20
      signature.</STRONG></FONT><BR>To perform similar analysis for =
human=20
      tumors, we translated<SUP> </SUP>the murine small signatures into =
a list=20
      of human homologs using<SUP> </SUP>the NCBI UniGene database=20
      (http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=3Dunigene)<SUP> =
</SUP>and=20
      retrieved the expression data for corresponding Affymetrix<SUP>=20
      </SUP>probe sets (Tables <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#T2">2</A>=20
      and <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#T3">3</A>=20
      and Supplemental Table 2). We calculated<SUP> </SUP>the SPAIs for =
each of=20
      the 9 metastatic tumors and 23 primary<SUP> </SUP>prostate =
carcinomas and=20
      determined that 7 of 9 samples of distant<SUP> </SUP>metastatic =
lesions=20
      from prostate cancer patients exhibited a<SUP> </SUP>stem =
cell=96like=20
      expression profile of the 11-gene MTTS/PNS<SUP> </SUP>signature =
(Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F4">4</A>B).=20
      In contrast, a majority of primary prostate<SUP> </SUP>tumors =
seemed to=20
      display a distinct expression profile of the<SUP> </SUP>11-gene =
MTTS/PNS=20
      signature as manifested in negative SPAI values<SUP> </SUP>(Figure =
<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F4">4</A>B).=20
      Interestingly, a subset of samples of primary prostate<SUP>=20
      </SUP>carcinomas manifested expression profiles of the 11-gene=20
      MTTS/PNS<SUP> </SUP>signature similar to those of the metastatic =
tumors,=20
      as reflected<SUP> </SUP>in positive correlation coefficients =
(positive=20
      SPAI values in<SUP> </SUP>Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F4">4</A>B),=20
      suggesting that primary prostate tumors with distinct<SUP>=20
      </SUP>expression profiles of the PNS neurosphere=96derived =
11-gene<SUP>=20
      </SUP>signature (e.g., positive and negative SPAI values) may =
have<SUP>=20
      </SUP>different biological features and distinct clinical =
courses<SUP>=20
      </SUP>of disease progression. Validation analysis using the CNS=20
      neurosphere=96derived<SUP> </SUP>MTTS/CNS 11-gene signature and =
MTTS/PNS/CNS=20
      14-gene signature<SUP> </SUP>indicates that application of these=20
      signatures is less informative<SUP> </SUP>in distinguishing =
metastatic and=20
      primary human prostate tumors<SUP> </SUP>(Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F4">4</A>,=20
      E and H).<SUP> </SUP>
      <P><A name=3DT2><!-- null --></A><BR clear=3Dall>
      <CENTER>
      <TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD>
            <TABLE cellSpacing=3D2 cellPadding=3D2>
              <TBODY>
              <TR bgColor=3D#e1e1e1>
                <TD vAlign=3Dtop align=3Dmiddle =
bgColor=3D#ffffff><STRONG>View this=20
                  table:</STRONG><BR><NOBR><A=20
                  =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503/T2">[in=20
                  this window]</A><BR><A=20
                  onmouseover=3D"window.status=3D'View table in a =
separate window'; return true"=20
                  onclick=3D"startTarget('T2', 590, 597); =
this.href=3D'/cgi/content-nw/full/115/6/1503/T2'"=20
                  =
href=3D"http://www.jci.org/cgi/content-nw/full/115/6/1503/T2"=20
                  target=3DT2>[in a new window]</A><BR>&nbsp;</NOBR> =
</TD>
                <TD vAlign=3Dtop align=3Dleft><STRONG><B>Table 2</B>=20
                  </STRONG><SUP></SUP><BR>Cancer types and number of =
cancer=20
                  patients in the therapy-outcome sets analyzed in this =
study
                  =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR><A=20
      name=3DT3><!-- null --></A><BR clear=3Dall>
      <CENTER>
      <TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD>
            <TABLE cellSpacing=3D2 cellPadding=3D2>
              <TBODY>
              <TR bgColor=3D#e1e1e1>
                <TD vAlign=3Dtop align=3Dmiddle =
bgColor=3D#ffffff><STRONG>View this=20
                  table:</STRONG><BR><NOBR><A=20
                  =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503/T3">[in=20
                  this window]</A><BR><A=20
                  onmouseover=3D"window.status=3D'View table in a =
separate window'; return true"=20
                  onclick=3D"startTarget('T3', 590, 532); =
this.href=3D'/cgi/content-nw/full/115/6/1503/T3'"=20
                  =
href=3D"http://www.jci.org/cgi/content-nw/full/115/6/1503/T3"=20
                  target=3DT3>[in a new window]</A><BR>&nbsp;</NOBR> =
</TD>
                <TD vAlign=3Dtop align=3Dleft><STRONG><B>Table 3</B>=20
                  </STRONG><SUP></SUP><BR>The 11-gene signature =
associated with=20
                  poor prognosis of cancer patients diagnosed with =
multiple=20
                  types of cancer
                  =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR>To=20
      evaluate the potential biological significance and clinical<SUP>=20
      </SUP>utility of the 11-gene MTTS/PNS signature expression in =
human<SUP>=20
      </SUP>prostate cancer, we set out to examine whether the =
detection<SUP>=20
      </SUP>of a stem cell=96like expression profile in primary =
prostate<SUP>=20
      </SUP>tumors of individual cancer patients would help in =
patients=92<SUP>=20
      </SUP>stratification at the time of diagnosis into subgroups =
with<SUP>=20
      </SUP>distinct courses of disease progression based on differing=20
      therapy<SUP> </SUP>outcome after radical prostatectomy (RP). We =
assessed=20
      the prognostic<SUP> </SUP>power of the 11-gene signature based on =
ability=20
      to segregate<SUP> </SUP>the patients with recurrent and =
nonrecurrent=20
      course of disease<SUP> </SUP>progression after RP into distinct =
subgroups.=20
      We calculated<SUP> </SUP>a Pearson correlation coefficient for =
each of 21=20
      tumor samples<SUP> </SUP>of outcome set 1 by comparing the 11-gene =

      signature expression<SUP> </SUP>profiles of individual samples =
with the=20
      stem cell=96like<SUP> </SUP>expression profile of the 11-gene =
BMI-1=96pathway=20
      signature<SUP> </SUP>in PNS neurospheres (Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F2">2</A>).=20
      To determine the prognostic<SUP> </SUP>power of the 11-gene =
signature, we=20
      performed the Kaplan-Meier<SUP> </SUP>survival analysis using, as =
a=20
      clinical endpoint, the disease-free<SUP> </SUP>interval after =
therapy in=20
      prostate cancer patients with positive<SUP> </SUP>and negative =
SPAIs.<SUP>=20
      </SUP>
      <P>The Kaplan-Meier survival curves showed a highly =
significant<SUP>=20
      </SUP>difference in the probability that prostate cancer =
patients<SUP>=20
      </SUP>would remain disease-free after therapy between the groups =
with<SUP>=20
      </SUP>positive and negative SPAIs defined by the 11-gene =
MTTS/PNS<SUP>=20
      </SUP>signature (Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F4">4</A>C),=20
      suggesting that patients with positive<SUP> </SUP>SPAIs exhibit a =
poor=20
      outcome signature whereas patients with<SUP> </SUP>negative SPAIs =
manifest=20
      a good outcome signature. The estimated<SUP> </SUP>hazard ratio =
for=20
      disease recurrence after therapy in the group<SUP> </SUP>of =
patients with=20
      positive SPAIs as compared with the group of<SUP> </SUP>patients =
with=20
      negative SPAIs defined by the 11-gene MTTS/PNS<SUP> =
</SUP>signature=20
      (Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F4">4</A>C)=20
      was 9.259 (95% confidence interval of<SUP> </SUP>ratio, =
1.545=9626.07;=20
      <I>P</I> =3D 0.0104). Fifty-eight percent of<SUP> </SUP>patients =
with=20
      positive SPAIs had a disease recurrence within<SUP> </SUP>3 years =
after=20
      therapy, whereas 90% of patients with negative<SUP> </SUP>SPAIs =
remained=20
      relapse-free (Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F4">4</A>C).=20
      Five years after therapy,<SUP> </SUP>69% of patients with positive =
SPAIs=20
      had a disease recurrence,<SUP> </SUP>whereas 90% of patients with =
negative=20
      SPAIs remained relapse-free<SUP> </SUP>(Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F4">4</A>C).=20
      In contrast to the PNS neurosphere=96derived<SUP> </SUP>signature, =
the CNS=20
      neurosphere=96derived signature failed<SUP> </SUP>to stratify the =
prostate=20
      cancer patients into prognostic subgroups<SUP> </SUP>with distinct =

      probability of disease relapse after therapy (<I>P</I><SUP> =
</SUP>=3D=20
      0.6501; Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F4">4</A>F).=20
      Similarly, the 14-gene MTTS/PNS/CNS signature<SUP> </SUP>failed in =
both=20
      classification-performance tests using human<SUP> </SUP>cancer =
specimens=20
      (<I>P</I> =3D 0.4916; Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F4">4</A>,=20
      H and I). Based on this<SUP> </SUP>analysis, we identified the =
11-gene=20
      MTTS/PNS signature as a<SUP> </SUP>best-performing =
malignant-phenotype=20
      classifier and proposed<SUP> </SUP>to identify the group of =
prostate=20
      cancer patients with positive<SUP> </SUP>values of the PNS=20
      neurosphere=96derived 11-gene signature<SUP> </SUP>as a =
poor-prognosis group=20
      and the group of prostate cancer patients<SUP> </SUP>with negative =
values=20
      of the 11-gene signature as a good-prognosis<SUP> =
</SUP>group.<SUP> </SUP>
      <P>The identified signature genes were defined based on a =
strong<SUP>=20
      </SUP>correlative behavior in multiple independent sets of=20
      experimental<SUP> </SUP>and clinical samples obtained from 2 =
species (mice=20
      and humans).<SUP> </SUP>To test by independent methods the =
suspected=20
      association of<SUP> </SUP>the expression of BMI-1=96pathway target =
genes=20
      with the<SUP> </SUP>expression of the BMI-1 gene product in the =
context of=20
      human<SUP> </SUP>cancer cells, we subjected human prostate =
carcinoma cells=20
      to<SUP> </SUP>small interfering RNA=96mediated (siRNA-mediated)=20
      silencing<SUP> </SUP>of expression of the endogenous <I>BMI-1</I> =
gene.=20
      The PC-3-32 human<SUP> </SUP>prostate carcinoma cells were =
transfected=20
      with <I>BMI-1</I> or control<SUP> </SUP>siRNAs and continuously =
monitored=20
      for mRNA expression levels<SUP> </SUP>of <I>BMI-1</I> and a =
selected set=20
      of genes using RT-PCR and Q-RT-PCR<SUP> </SUP>methods (data not =
shown).=20
      Q-RT-PCR and RT-PCR analyses showed<SUP> </SUP>that the =
siRNA-mediated=20
      <I>BMI-1</I>=96silencing protocol allowed<SUP> </SUP>for =
approximately 90%=20
      inhibition of the endogenous <I>BMI-1</I> mRNA<SUP> =
</SUP>expression. We=20
      validated the effect of siRNA-mediated <I>BMI-1</I><SUP> =
</SUP>silencing=20
      at the BMI-1 protein expression level using immunofluorescent<SUP> =

      </SUP>analysis. The <I>BMI-1</I> silencing was specific, since the =

      expression<SUP> </SUP>levels of 9 unrelated transcripts (such as=20
      <I>GAPDH</I>, <I>EZH2</I>, and<SUP> </SUP>several other genes) =
were not=20
      altered (data not shown). Consistent<SUP> </SUP>with the =
hypothesis that=20
      expression of genes comprising the<SUP> </SUP>BMI-1=96pathway =
signature is=20
      associated with the expression<SUP> </SUP>of the BMI-1 gene =
product, mRNA=20
      abundance levels of 8 of 11<SUP> </SUP>interrogated =
BMI-1=96pathway target=20
      genes were altered in<SUP> </SUP>the human prostate carcinoma =
cells with=20
      approximately 90% silenced<SUP> </SUP><I>BMI-1</I> gene.<SUP> =
</SUP>
      <P>Reduction of the <I>BMI-1</I> mRNA and protein expression in =
human<SUP>=20
      </SUP>prostate carcinoma metastasis precursor cells did not =
alter<SUP>=20
      </SUP>significantly the viability of adherent cultures grown at =
the<SUP>=20
      </SUP>optimal growth condition and in serum-starvation =
experiments<SUP>=20
      </SUP>(data not shown) and had only modest inhibitory effect on=20
      proliferation<SUP> </SUP>(an approximately 25=9630% reduction in =
the number=20
      of cells<SUP> </SUP>during the 3-day silencing protocol). However, =
the=20
      ability of<SUP> </SUP>human prostate carcinoma cells to survive in =
a=20
      nonadherent state<SUP> </SUP>was severely affected after =
siRNA-mediated=20
      reduction of the<SUP> </SUP><I>BMI-1</I> expression.=20
      Fluorescence-activated cell sorting (FACS)<SUP> </SUP>analysis =
revealed an=20
      approximately 3-fold increase of apoptosis<SUP> </SUP>in the =
<I>BMI-1</I>=20
      siRNA=96treated human prostate carcinoma cells<SUP> </SUP>cultured =
in=20
      nonadherent conditions. These data suggest that<SUP> </SUP>human =
prostate=20
      carcinoma cells expressing a high level of the<SUP> </SUP>BMI-1 =
protein=20
      are more resistant to apoptosis induced in cells<SUP> </SUP>of =
epithelial=20
      origin in response to attachment deprivation (anoikis)<SUP> =
</SUP>and,=20
      perhaps, would survive better in blood during metastatic<SUP>=20
      </SUP>dissemination, thus forming a pool of metastasis precursor=20
      cells<SUP> </SUP>that can survive circulatory stress. Thorough =
follow-up=20
      experiments<SUP> </SUP>would be required to establish to a full =
extent the=20
      biological<SUP> </SUP>and functional role of BMI-1 overexpression =
and=20
      BMI-1=96pathway<SUP> </SUP>activation in the various epithelial=20
      cancers.<SUP> </SUP>
      <P><FONT size=3D-1><STRONG>Expression of the 11-gene MTTS/PNS =
signature in=20
      primary prostate tumors is a predictor of a therapy failure in =
prostate=20
      cancer patients.</STRONG></FONT><BR>To validate a survival =
prediction=20
      model based on the 11-gene<SUP> </SUP>MTTS/PNS signature, we =
tested the=20
      prognostic performance of<SUP> </SUP>the model in multiple =
independent=20
      therapy-outcome data sets<SUP> </SUP>representing 5 epithelial and =
5=20
      nonepithelial cancers (Table<SUP> </SUP><A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#T3">3</A>).=20
      We divided patients within individual cohorts into a training<SUP> =

      </SUP>set, which was used to select the cutoff threshold and to =
test<SUP>=20
      </SUP>the model, and a test set, which was used to evaluate the=20
      reproducibility<SUP> </SUP>of the classification performance. =
Using the=20
      training set of<SUP> </SUP>samples, we selected the=20
      prognosis-discrimination cutoff value<SUP> </SUP>for a signature =
based on=20
      the highest level of statistical significance<SUP> </SUP>in =
patients=92=20
      stratification into poor- and good-prognosis<SUP> </SUP>groups as=20
      determined by the log-rank test (lowest <I>P</I> value and<SUP>=20
      </SUP>highest hazard ratio in the training set). Clinical =
samples<SUP>=20
      </SUP>having the Pearson correlation coefficient at or higher =
than<SUP>=20
      </SUP>the cutoff value were identified as having the =
poor-prognosis<SUP>=20
      </SUP>signature. Clinical samples with the Pearson correlation=20
      coefficient<SUP> </SUP>lower than the cutoff value were identified =
as=20
      having the good-prognosis<SUP> </SUP>signature. The same =
discrimination=20
      cutoff value was then applied<SUP> </SUP>to evaluate the =
reproducibility=20
      of the prognostic performance<SUP> </SUP>in the test set of =
patients.=20
      Lastly, we applied the model to<SUP> </SUP>the entire outcome set =
using=20
      the same cutoff threshold to confirm<SUP> </SUP>the classification =

      performance. The training and test sets were<SUP> </SUP>balanced =
with=20
      respect to the total number of patients, negative<SUP> </SUP>and =
positive=20
      therapy outcomes, and the length of survival. At<SUP> </SUP>this =
stage of=20
      the analysis, we did not carry out additional<SUP> </SUP>model =
training,=20
      development, or optimization steps, except for<SUP> =
</SUP>selection of a=20
      prognostic cutoff threshold in the training set.<SUP> =
</SUP>Throughout the=20
      study, we consistently used the same MTTS/PNS<SUP> =
</SUP>expression=20
      profile as a reference standard to quantify the Pearson<SUP>=20
      </SUP>correlation coefficients of the individual samples.<SUP> =
</SUP>
      <P>In addition to this analysis, we confirmed the model =
performance<SUP>=20
      </SUP>using various sample-stratification approaches, such as =
terrain<SUP>=20
      </SUP>(TRN) clustering (Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F5">5</A>),=20
      support vector machine (SVM) classification<SUP> =
</SUP>(Supplemental Table=20
      4), and weighted survival score algorithm<SUP> </SUP>(Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F6">6</A>E=20
      and Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F7">7</A>D).=20
      Finally, we evaluated the therapy<SUP> </SUP>outcome=96predictive =
power of=20
      the 11-gene model in a prostate<SUP> </SUP>cancer setting using a=20
      prognostic test based on an independent<SUP> </SUP>method of gene=20
      expression analysis, namely the Q-RT-PCR method<SUP> </SUP>(Figure =
<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F6">6</A>F).<SUP>=20
      </SUP>
      <P><A name=3DF5><!-- null --></A><BR clear=3Dall>
      <CENTER>
      <TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD>
            <TABLE cellSpacing=3D2 cellPadding=3D2>
              <TBODY>
              <TR bgColor=3D#e1e1e1>
                <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
                  =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503/F5"><IMG=20
                  height=3D132 alt=3D" " hspace=3D10=20
                  =
src=3D"http://www.jci.org/content/vol115/issue6/images/small/JCI0523412.f=
5.gif"=20
                  width=3D200 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
                  version</STRONG> (36K):<BR><NOBR><A=20
                  =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503/F5">[in=20
                  this window]</A><BR><A=20
                  onmouseover=3D"window.status=3D'View figure in a =
separate window'; return true"=20
                  onclick=3D"startTarget('F5', 590, 491); =
this.href=3D'/cgi/content-nw/full/115/6/1503/F5'"=20
                  =
href=3D"http://www.jci.org/cgi/content-nw/full/115/6/1503/F5"=20
                  target=3DF5>[in a new window]</A><BR>&nbsp;</NOBR> =
</TD>
                <TD vAlign=3Dtop align=3Dleft><STRONG><B>Figure 5</B>=20
                  </STRONG><SUP></SUP><BR>TRN analysis within the mRNA =
abundance=20
                  space of genes constituting the 11-gene MTTS/PNS =
signature=20
                  reveals clustering patterns, among prostate cancer =
(<B>A</B>=20
                  and <B>B</B>) and breast cancer (<B>C</B> and =
<B>D</B>)=20
                  patients, that are associated with distinct =
frequencies of=20
                  therapy failure (<B>A</B> and <B>B</B>) and differing=20
                  probability of disease-free survival after therapy =
(<B>C</B>=20
                  and <B>D</B>). A TRN clustering algorithm was applied =
to the=20
                  79 samples (<B>A</B>) constituting prostate cancer =
therapy=20
                  outcome set 2 and the 97 samples (<B>C</B>) =
constituting the=20
                  breast cancer therapy outcome set. Kaplan-Meier =
analysis=20
                  (<B>B</B> and <B>D</B>) was applied to subgroups of =
patients=20
                  defined by the TRN clustering algorithm as shown in =
<B>A</B>=20
                  and <B>C</B>.
                  =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR><A=20
      name=3DF6><!-- null --></A><BR clear=3Dall>
      <CENTER>
      <TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD>
            <TABLE cellSpacing=3D2 cellPadding=3D2>
              <TBODY>
              <TR bgColor=3D#e1e1e1>
                <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
                  =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503/F6"><IMG=20
                  height=3D131 alt=3D" " hspace=3D10=20
                  =
src=3D"http://www.jci.org/content/vol115/issue6/images/small/JCI0523412.f=
6.gif"=20
                  width=3D200 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
                  version</STRONG> (32K):<BR><NOBR><A=20
                  =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503/F6">[in=20
                  this window]</A><BR><A=20
                  onmouseover=3D"window.status=3D'View figure in a =
separate window'; return true"=20
                  onclick=3D"startTarget('F6', 590, 489); =
this.href=3D'/cgi/content-nw/full/115/6/1503/F6'"=20
                  =
href=3D"http://www.jci.org/cgi/content-nw/full/115/6/1503/F6"=20
                  target=3DF6>[in a new window]</A><BR>&nbsp;</NOBR> =
</TD>
                <TD vAlign=3Dtop align=3Dleft><STRONG><B>Figure 6</B>=20
                  </STRONG><SUP></SUP><BR>Classification of prostate =
cancer=20
                  patients into subgroups with distinct therapy outcome =
based on=20
                  expression profile of the 11-gene MTTS/PNS signature.=20
                  (<B>A</B>=96<B>C</B>) Kaplan-Meier analysis of the =
probability=20
                  that patients would remain disease-free among 79 =
prostate=20
                  cancer patients constituting clinical outcome set 2, =
according=20
                  to whether they had a good-prognosis or a =
poor-prognosis=20
                  signature as defined by the expression profiles of the =
11-gene=20
                  MTTS/PNS signature. The patients=92 stratification =
cutoff value=20
                  of 0.4 was defined in the training set of 40 patients =
(19 poor=20
                  prognosis and 21 good prognosis; <B>A</B>), validated =
in a=20
                  test set of 39 patients (18 poor prognosis and 21 good =

                  prognosis; <B>B</B>) and confirmed in an entire cohort =
of 79=20
                  patients (<B>C</B>). (<B>D</B>) Kaplan-Meier survival =
curves=20
                  for distinct subgroups of prostate cancer patients =
diagnosed=20
                  with early-stage disease (stages 1C and 2A). =
(<B>E</B>)=20
                  Kaplan-Meier survival curves for 79 prostate cancer =
patients=20
                  stratified into distinct subgroups using a weighted =
survival=20
                  predictor score algorithm. (<B>F</B>) Kaplan-Meier =
survival=20
                  curves for 20 prostate cancer patients stratified into =

                  distinct subgroups using Q-RT-PCR assay of the 11-gene =

                  signature.
                  =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR><A=20
      name=3DF7><!-- null --></A><BR clear=3Dall>
      <CENTER>
      <TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD>
            <TABLE cellSpacing=3D2 cellPadding=3D2>
              <TBODY>
              <TR bgColor=3D#e1e1e1>
                <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
                  =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503/F7"><IMG=20
                  height=3D200 alt=3D" " hspace=3D10=20
                  =
src=3D"http://www.jci.org/content/vol115/issue6/images/small/JCI0523412.f=
7.gif"=20
                  width=3D129 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
                  version</STRONG> (31K):<BR><NOBR><A=20
                  =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503/F7">[in=20
                  this window]</A><BR><A=20
                  onmouseover=3D"window.status=3D'View figure in a =
separate window'; return true"=20
                  onclick=3D"startTarget('F7', 434, 640); =
this.href=3D'/cgi/content-nw/full/115/6/1503/F7'"=20
                  =
href=3D"http://www.jci.org/cgi/content-nw/full/115/6/1503/F7"=20
                  target=3DF7>[in a new window]</A><BR>&nbsp;</NOBR> =
</TD>
                <TD vAlign=3Dtop align=3Dleft><STRONG><B>Figure 7</B>=20
                  </STRONG><SUP></SUP><BR>Classification of patients =
diagnosed=20
                  with 4 different types of epithelial cancer into =
subgroups=20
                  with distinct therapy outcome based on expression =
profile of=20
                  the 11-gene MTTS/PNS signa-ture. Kaplan-Meier analysis =
of the=20
                  probability that patients would remain metastasis-free =
(for=20
                  the breast cancer group) or survive after therapy (for =
the=20
                  other groups) among 97 early-stage breast cancer =
patients=20
                  (<B>A</B>=96<B>D</B>), 125 lung adenocarcinoma =
patients of all=20
                  stages (<B>E</B>=96<B>G</B>), 35 lung adenocarcinoma =
patients=20
                  diagnosed with stage 1A disease (<B>H</B>), 37 ovarian =
cancer=20
                  patients of all stages (<B>I</B>=96<B>K</B>), and 31 =
bladder=20
                  cancer patients (<B>L</B>=96<B>N</B>), according to =
whe-ther=20
                  they had a good-prognosis or a poor-prognosis =
signature as=20
                  defined by the expression profiles of the 11-gene =
MTTS/PNS=20
                  signature. For each type of cancer, the patient=92s=20
                  stratification cutoff value was defined in the =
training set,=20
                  validated in a test set, and confirmed in an entire =
cohort.=20
                  <B>D</B> and <B>I</B>=96<B>K</B> show the Kaplan-Meier =
survival=20
                  curves for 97 breast cancer patients and 37 ovarian =
cancer=20
                  patients, respectively, stratified into distinct =
subgroups=20
                  using a weighted survival predictor score algorithm.
                  =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR>To=20
      further validate the potential clinical utility of the =
11-gene<SUP>=20
      </SUP>MTTS/PNS signature, we evaluated the prognostic power of =
the<SUP>=20
      </SUP>11-gene signature applied to an independent set of 79 =
clinical<SUP>=20
      </SUP>samples (prostate cancer outcome set 2) obtained from 37=20
      prostate<SUP> </SUP>cancer patients who developed recurrence after =
the=20
      therapy and<SUP> </SUP>42 patients who remained disease-free. In =
this=20
      cohort of patients,<SUP> </SUP>the Kaplan-Meier survival analysis=20
      demonstrated a highly significant<SUP> </SUP>difference in the =
probability=20
      that prostate cancer patients<SUP> </SUP>would remain disease-free =
after=20
      therapy between the groups with<SUP> </SUP>positive and negative =
SPAIs=20
      defined by the 11-gene BMI-1=96pathway<SUP> </SUP>signature =
(Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F6">6</A>,=20
      A=96C). The estimated hazard ratio<SUP> </SUP>for disease =
recurrence after=20
      therapy in the group of patients<SUP> </SUP>with positive SPAIs as =

      compared with the group of patients with<SUP> </SUP>negative SPAIs =
defined=20
      by the 11-gene MTTS/PNS signature (Figure<SUP> </SUP><A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F6">6</A>C)=20
      was 3.74 (95% confidence interval of ratio, 3.010=9625.83;<SUP>=20
      </SUP><I>P</I> &lt; 0.0001). Sixty-seven percent of patients with=20
      positive<SUP> </SUP>SPAIs had a disease recurrence within 3 years =
after=20
      therapy,<SUP> </SUP>whereas 70% of patients with negative SPAIs =
remained=20
      relapse-free<SUP> </SUP>(Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F6">6</A>C).=20
      Five years after therapy, 83% of patients with<SUP> </SUP>positive =
SPAIs=20
      had a disease recurrence, whereas 64% of patients<SUP> </SUP>with =
negative=20
      SPAIs remained relapse-free (Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F6">6</A>C).<SUP>=20
      </SUP>
      <P>The standard Kaplan-Meier log-rank statistic assesses the=20
      difference<SUP> </SUP>in the survival curves. However, it does not =
test=20
      for multiple<SUP> </SUP>hypotheses or account for random =
co-occurrence;=20
      this represents<SUP> </SUP>an inherent problem of the gene =
expression=20
      profiling experiments.<SUP> </SUP>We attempted to partly mitigate =
this=20
      problem by using an alternative<SUP> </SUP>biological endpoint to =
the=20
      patients=92 survival during the<SUP> </SUP>signature selection =
process and=20
      by applying the survival analysis<SUP> </SUP>to a single =
signature, thus=20
      eliminating the multiple comparisons<SUP> </SUP>from the survival =
model=20
      building protocol. The MTTS signature<SUP> </SUP>is likely to =
carry many=20
      gene expression patterns displaying<SUP> </SUP>the power to =
discriminate=20
      the metastatic phenotype that have<SUP> </SUP>no relation to the=20
      transcriptional program of normal stem cells.<SUP> </SUP>One of =
our main=20
      goals was to identify the stem cell signature<SUP> </SUP>that is=20
      associated with the pluripotency self-renewal phenotype<SUP> =
</SUP>and is=20
      embedded into MTTS signature. This approach implies that<SUP> =
</SUP>a=20
      candidate marker signature would have a defined stem =
cell=96like<SUP>=20
      </SUP>expression profile that can be used in the subsequent =
follow-up<SUP>=20
      </SUP>validation analyses as a reference standard to look for=20
      expression<SUP> </SUP>of a stem cell=96like signature in clinical =
samples.=20
      To<SUP> </SUP>further assess the statistical validity of the =
11-gene=20
      stem<SUP> </SUP>cell=96like profile, we performed 1,000 random=20
      permutations<SUP> </SUP>of the 11-gene stem cell profiles randomly =

      selected from the<SUP> </SUP>1,973-gene PNS signature. For each =
random=20
      11-gene stem cell<SUP> </SUP>profile, we assessed its metastatic=20
      phenotype=96discriminative<SUP> </SUP>performance in the TRAMP =
transgenic=20
      mouse model at the discriminative<SUP> </SUP>confidence levels of =
the=20
      11-gene BMI-1-pathway MTTS/PNS signature.<SUP> </SUP>Only 1 random =
11-gene=20
      stem cell profile of the 1,000 permutations<SUP> =
</SUP>demonstrated=20
      classification power matching the metastatic =
phenotype=96discriminative<SUP>=20
      </SUP>performance of the 11-gene MTTS/PNS signature. We =
performed<SUP>=20
      </SUP>10,000 permutations to test the likelihood that small =
11-gene<SUP>=20
      </SUP>signatures derived from the large MTTS signature would =
display<SUP>=20
      </SUP>high discrimination power to assess the significance at =
the<SUP>=20
      </SUP>0.1% level. We carried out 10,000 permutations of small =
11-gene<SUP>=20
      </SUP>signatures derived from the large 1,345-gene MTTS =
signature<SUP>=20
      </SUP>and compared their sample-stratification power with that =
of<SUP>=20
      </SUP>the 11-gene MTTS/PNS signature. The =
classification-performance<SUP>=20
      </SUP>cutoff <I>P</I> values were established by application of a=20
      2-tailed<SUP> </SUP>Student=92s <I>t</I> test to the 11-gene =
MTTS/PNS=20
      signature (<I>P</I><SUP> </SUP>=3D 0.0005 for metastasis versus =
primary=20
      prostate cancer data<SUP> </SUP>set and <I>P</I> =3D 0.026 for =
recurrent=20
      versus nonrecurrent prostate<SUP> </SUP>cancer data set). We found =
that=20
      10,000 permutations generated<SUP> </SUP>7 random 11-gene =
signatures=20
      performing at the sample-classification<SUP> </SUP>level of the =
11-gene=20
      MTTS/PNS signature.<SUP> </SUP>
      <P><FONT size=3D-1><STRONG>Cox proportional hazard survival =
regression=20
      analysis.</STRONG></FONT><BR>To ascertain the incremental =
statistical=20
      power of the individual<SUP> </SUP>covariates as predictors of =
therapy=20
      outcome and unfavorable<SUP> </SUP>prognosis, we performed both =
univariate=20
      and multivariate Cox<SUP> </SUP>proportional hazard survival =
analyses=20
      (Table <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#T4">4</A>).=20
      Several individual<SUP> </SUP>gene members of the 11-gene =
signature, such=20
      as <I>KI67</I> and <I>Cyclin<SUP> </SUP>B1</I>, have been =
described=20
      previously as significant predictors<SUP> </SUP>of prognosis and =
may=20
      reflect correlation between proliferative<SUP> </SUP>fraction and =
poor=20
      therapy outcome as has been shown recently<SUP> </SUP>for the =
lymphoma=20
      survival predictor signature. However, our<SUP> </SUP>analysis =
appears to=20
      indicate that the 11-gene signature is a<SUP> </SUP>more uniform=20
      therapy-outcome predictor across the multiple data<SUP> </SUP>sets =

      compared with the individual genes (see below) and, perhaps,<SUP> =
</SUP>is=20
      a better "integrator" and "sensor" of the biological =
diversity<SUP>=20
      </SUP>across the spectrum of human cancers. We performed both=20
      univariate<SUP> </SUP>and multivariate Cox proportional hazard =
survival=20
      analyses to<SUP> </SUP>compare the prognostic performance of the =
entire=20
      11-gene signature<SUP> </SUP>and individual genes (Table <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#T4">4</A>=20
      and Supplemental Table 3). In<SUP> </SUP>the univariate analysis,=20
      prognostic performance of <I>KI67</I> expression<SUP> </SUP>as a =
predictor=20
      of therapy outcome varied in different outcome<SUP> </SUP>data =
sets. It=20
      was highly significant in the prostate cancer<SUP> </SUP>therapy =
outcome=20
      set 2 (Memorial Sloan-Kettering Cancer Center<SUP> </SUP>[MSKCC] =
data=20
      set); however, it showed only a trend toward statistical<SUP>=20
      </SUP>significance in the prostate cancer outcome set 1 (<I>P</I> =
=3D=20
      0.1;<SUP> </SUP>Harvard data set) and the breast cancer outcome =
data set=20
      (<I>P</I><SUP> </SUP>=3D 0.0533). In prostate cancer, the =
significant=20
      prognosis predictors<SUP> </SUP>in univariate Cox regression =
analysis were=20
      <I>KI67</I>, <I>ANK3</I>, <I>FGFR2</I>,<SUP> </SUP><I>CES</I>, and =
the=20
      11-gene MTTS/PNS signature. In breast cancer, the<SUP> =
</SUP>significant=20
      prognosis predictors in univariate analysis were<SUP> =
</SUP><I>Cyclin=20
      B1</I>, <I>BUB1</I>, <I>HEC</I>, and the 11-gene signature. Thus, =
our=20
      analysis<SUP> </SUP>seems to indicate that individual genes =
demonstrate a=20
      variable<SUP> </SUP>performance across multiple outcome data sets, =
and we=20
      were unable<SUP> </SUP>to identify a single gene uniformly =
predictive of=20
      the poor therapy<SUP> </SUP>outcome.<SUP> </SUP>
      <P><A name=3DT4><!-- null --></A><BR clear=3Dall>
      <CENTER>
      <TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD>
            <TABLE cellSpacing=3D2 cellPadding=3D2>
              <TBODY>
              <TR bgColor=3D#e1e1e1>
                <TD vAlign=3Dtop align=3Dmiddle =
bgColor=3D#ffffff><STRONG>View this=20
                  table:</STRONG><BR><NOBR><A=20
                  =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503/T4">[in=20
                  this window]</A><BR><A=20
                  onmouseover=3D"window.status=3D'View table in a =
separate window'; return true"=20
                  onclick=3D"startTarget('T4', 421, 640); =
this.href=3D'/cgi/content-nw/full/115/6/1503/T4'"=20
                  =
href=3D"http://www.jci.org/cgi/content-nw/full/115/6/1503/T4"=20
                  target=3DT4>[in a new window]</A><BR>&nbsp;</NOBR> =
</TD>
                <TD vAlign=3Dtop align=3Dleft><STRONG><B>Table 4</B>=20
                  </STRONG><SUP></SUP><BR>Cox proportional hazard =
survival=20
                  regression analysis
                  =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR>In=20
      the multivariate analysis (Table <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#T5">5</A>),=20
      the most significant<SUP> </SUP>prostate cancer recurrence =
predictor was=20
      the model that included<SUP> </SUP>11 covariates (11-gene =
signature; 4=20
      individual genes [<I>KI67</I>,<SUP> </SUP><I>ANK3</I>, =
<I>FGFR2</I>, and=20
      <I>CES1</I>]; and 6 clinico-pathological features<SUP> =
</SUP>[pre-RP PSA,=20
      RP Gleason sum, surgical margins, seminal vesicle<SUP> =
</SUP>invasion,=20
      age, and extracapsular extension]). Interestingly,<SUP> =
</SUP>several=20
      covariates, such as the 11-gene signature, <I>KI67</I>, =
<I>CES1</I>,<SUP>=20
      </SUP>pre-RP prostate-specific antigen (PSA) level, surgical =
margins,<SUP>=20
      </SUP>and extracapsular extension, remained statistically =
significant<SUP>=20
      </SUP>prognostic markers in the multivariate analysis (Table <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#T5">5</A>).=20
      Thus,<SUP> </SUP>while prognostic performance of individual gene =
members=20
      of the<SUP> </SUP>11-gene signature varied greatly in different =
outcome=20
      data sets,<SUP> </SUP>the identified 11-gene signature seems to =
perform as=20
      the most<SUP> </SUP>consistent predictor of poor therapy outcome =
across=20
      multiple<SUP> </SUP>independent outcome data sets comprising over =
1,000=20
      clinical<SUP> </SUP>samples and representing 11 distinct types of =
human=20
      cancer (see<SUP> </SUP>below). Yet the statistically =
best-performing=20
      multivariate cancer<SUP> </SUP>type=96specific model seems to =
require a=20
      combination of<SUP> </SUP>calls based on expression levels of =
individual=20
      genes, a gene<SUP> </SUP>expression signature, and =
clinico-pathological=20
      covariates (Tables<SUP> </SUP><A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#T4">4</A>=20
      and <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#T5">5</A>).<SUP>=20
      </SUP>
      <P><A name=3DT5><!-- null --></A><BR clear=3Dall>
      <CENTER>
      <TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD>
            <TABLE cellSpacing=3D2 cellPadding=3D2>
              <TBODY>
              <TR bgColor=3D#e1e1e1>
                <TD vAlign=3Dtop align=3Dmiddle =
bgColor=3D#ffffff><STRONG>View this=20
                  table:</STRONG><BR><NOBR><A=20
                  =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503/T5">[in=20
                  this window]</A><BR><A=20
                  onmouseover=3D"window.status=3D'View table in a =
separate window'; return true"=20
                  onclick=3D"startTarget('T5', 590, 497); =
this.href=3D'/cgi/content-nw/full/115/6/1503/T5'"=20
                  =
href=3D"http://www.jci.org/cgi/content-nw/full/115/6/1503/T5"=20
                  target=3DT5>[in a new window]</A><BR>&nbsp;</NOBR> =
</TD>
                <TD vAlign=3Dtop align=3Dleft><STRONG><B>Table 5</B>=20
                  </STRONG><SUP></SUP><BR>11-Covariate prostate cancer=20
                  recurrence predictor model
                  =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR>We=20
      sought to use an alternative statistical metric to further<SUP>=20
      </SUP>evaluate the prognostic power of the genes constituting =
the<SUP>=20
      </SUP>11-gene signature. We implemented the weighted survival =
score<SUP>=20
      </SUP>analysis to reflect the incremental statistical power of =
the<SUP>=20
      </SUP>individual covariates as predictors of therapy outcome =
based<SUP>=20
      </SUP>on a multicomponent prognostic model (Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F6">6</A>E).=20
      Final survival<SUP> </SUP>predictor score comprises a sum of =
scores for=20
      individual genes<SUP> </SUP>and reflects the relative contribution =
of each=20
      of the 11 genes<SUP> </SUP>in the multivariate analysis. The =
negative=20
      weighting values<SUP> </SUP>imply that higher expression =
correlates with=20
      longer survival<SUP> </SUP>and favorable prognosis, whereas the =
positive=20
      score values indicate<SUP> </SUP>that higher expression correlates =
with=20
      poor outcome and shorter<SUP> </SUP>survival. Application of the =
weighted=20
      survival predictor model<SUP> </SUP>based on a cumulative score of =
the=20
      weighted expression values<SUP> </SUP>of 11 genes confirmed the =
prognostic=20
      power of the identified<SUP> </SUP>11-gene signature in =
stratification of=20
      prostate cancer patients<SUP> </SUP>into subgroups with =
statistically=20
      distinct probability of relapse-free<SUP> </SUP>survival after RP =
(Figure=20
      <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F6">6</A>E).<SUP>=20
      </SUP>
      <P><FONT size=3D-1><STRONG>Expression of the 11-gene MTTS/PNS =
signature is a=20
      predictor of a short relapse-free survival after therapy in =
prostate=20
      cancer patients with an early-stage=20
      disease.</STRONG></FONT><BR>Identification of patients with high=20
      likelihood of poor outcome<SUP> </SUP>after therapy would be =
particularly=20
      desirable in a cohort of<SUP> </SUP>patients diagnosed with a =
seemingly=20
      localized early-stage prostate<SUP> </SUP>cancer. Next we =
determined=20
      whether the 11-gene MTTS/PNS signature<SUP> </SUP>would be useful =
in=20
      defining subgroups of patients diagnosed<SUP> </SUP>with an =
early-stage=20
      prostate cancer and having a statistically<SUP> </SUP>significant=20
      difference in the likelihood of disease relapse<SUP> </SUP>after =
therapy.=20
      In the group of patients diagnosed with stage<SUP> </SUP>1C or 2A =
prostate=20
      cancer (Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F6">6</A>D),=20
      the median relapse-free<SUP> </SUP>survival after therapy in the=20
      poor-prognosis subgroup defined<SUP> </SUP>by the 11-gene =
BMI-1=96pathway=20
      signature was 27 months.<SUP> </SUP>In contrast, the median =
relapse-free=20
      survival after therapy<SUP> </SUP>in the good-prognosis group was =
82.4=20
      months. Eighty-eight percent<SUP> </SUP>of patients in the =
poor-prognosis=20
      subgroup had a disease recurrence<SUP> </SUP>within 5 years after =
therapy.=20
      Conversely, 64% of patients in<SUP> </SUP>the good-prognosis =
subgroup=20
      remained relapse-free (Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F6">6</A>D).<SUP>=20
      </SUP>The estimated hazard ratio for disease recurrence after =
therapy<SUP>=20
      </SUP>in the poor-prognosis subgroup as compared with the=20
      good-prognosis<SUP> </SUP>subgroup of patients defined by the =
11-gene=20
      signature was 3.907<SUP> </SUP>(95% confidence interval of ratio,=20
      2.687=9634.84; <I>P</I> =3D 0.0005).<SUP> </SUP>
      <P><FONT size=3D-1><STRONG>Validation of the prognostic =
performance of the=20
      11-gene BMI-1=96pathway signature using a Q-RT-PCR=96based=20
      assay.</STRONG></FONT><BR>Routine clinical use of prognostic tests =
based=20
      on microarray-derived<SUP> </SUP>gene expression signatures would =
require=20
      prospective validation<SUP> </SUP>study of the utility of =
identified=20
      markers in an experimental<SUP> </SUP>setting highly compatible =
with=20
      state-of-the-art clinical laboratory<SUP> </SUP>practice. Since=20
      microarray-based assay format is not readily<SUP> </SUP>available =
for=20
      application in the clinical laboratory, we considered<SUP> =
</SUP>the=20
      Q-RT-PCR=96based test as an alternative clinically compatible<SUP> =

      </SUP>analytical platform suitable for measurements of mRNA=20
      expression<SUP> </SUP>level of marker genes. Expression of mRNA =
for 11=20
      genes (Supplemental<SUP> </SUP>Table 1) and an endogenous control =
gene=20
      (<I>GAPDH</I>) was measured<SUP> </SUP>by real-time PCR in 20 =
specimens of=20
      primary prostate cancer<SUP> </SUP>obtained from patients with =
documented=20
      PSA recurrence within<SUP> </SUP>5 years after RP and patients who =

      remained disease-free for<SUP> </SUP>at least 5 years after RP (10 =

      patients in each group). As shown<SUP> </SUP>in Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F6">6</A>F,=20
      a prostate cancer therapy outcome test based on<SUP> =
</SUP>measurements of=20
      mRNA expression levels of 11 genes using Q-RT-PCR<SUP> =
</SUP>discriminates=20
      prostate cancer patients into subgroups with statistically<SUP>=20
      </SUP>distinct probability of relapse-free survival after RP.<SUP> =
</SUP>
      <P>The Kaplan-Meier survival analysis demonstrated that =
application<SUP>=20
      </SUP>of the 11-gene Q-RT-PCR=96based prostate cancer therapy<SUP> =

      </SUP>outcome test segregates prostate cancer patients into =
subgroups<SUP>=20
      </SUP>with statistically significant difference in the =
probability<SUP>=20
      </SUP>of remaining relapse-free after the therapy (Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F6">6</A>F).=20
      The<SUP> </SUP>estimated hazard ratio for disease recurrence after =

      therapy<SUP> </SUP>in the poor-prognosis group of patients as =
compared=20
      with the<SUP> </SUP>good-prognosis group defined by the test was =
21.3 (95%=20
      confidence<SUP> </SUP>interval of ratio, 5.741=9698.39; <I>P</I> =
&lt;=20
      0.0001). One hundred<SUP> </SUP>percent of patients in the =
poor-prognosis=20
      group had a disease<SUP> </SUP>recurrence within 4 years after RP, =
whereas=20
      91% of patients<SUP> </SUP>in the good-prognosis group remained=20
      relapse-free (Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F6">6</A>F).<SUP>=20
      </SUP>
      <P><FONT size=3D-1><STRONG>Expression of the 11-gene MTTS/PNS =
signature=20
      predicts metastatic recurrence and poor survival after therapy in =
breast=20
      cancer and lung adenocarcinoma patients diagnosed with an =
early-stage=20
      disease.</STRONG></FONT><BR>BMI-1 expression was previously =
implicated in=20
      human breast and<SUP> </SUP>lung cancers (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B11">11</A>,=20
      <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B12">12</A>,=20
      <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B31">31</A>),=20
      which suggests that activation of<SUP> </SUP>BMI-1=96associated =
pathway(s)=20
      might be relevant to these<SUP> </SUP>types of carcinomas as well. =
We=20
      therefore sought to investigate<SUP> </SUP>whether measurements of =

      expression of the 11-gene MTTS/PNS signature<SUP> </SUP>would be=20
      informative in the prediction of the patients=92<SUP> =
</SUP>prognosis in a=20
      group of 97 young women diagnosed with sporadic<SUP> </SUP>lymph=20
      node=96negative early-stage breast cancer who were<SUP> =
</SUP>analyzed in a=20
      recent expression profiling study of early-stage<SUP> </SUP>breast =
cancer=20
      (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B33">33</A>).=20
      (This group comprises 46 patients who developed<SUP> </SUP>distant =

      metastases within 5 years and 51 patients who continued<SUP> =
</SUP>to be=20
      disease-free at least 5 years after therapy; they constitute<SUP>=20
      </SUP>clinically defined poor-prognosis and good-prognosis =
groups,<SUP>=20
      </SUP>correspondingly.) Kaplan-Meier analysis indicates that =
breast<SUP>=20
      </SUP>cancer patients with tumors displaying a stem =
cell=96like<SUP>=20
      </SUP>expression profile of the 11-gene signature have a=20
      significantly<SUP> </SUP>higher probability of developing distant=20
      metastases within 5<SUP> </SUP>years after therapy and therefore =
can be=20
      identified as a poor-prognosis<SUP> </SUP>subgroup (Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F7">7</A>,=20
      A=96D). Median metastasis-free survival<SUP> </SUP>after therapy =
in the=20
      poor-prognosis subgroup of breast cancer<SUP> </SUP>patients =
defined by=20
      the 11-gene signature was 26 months. Eighty-four<SUP> =
</SUP>percent of=20
      patients in the poor-prognosis subgroup were diagnosed<SUP> =
</SUP>with=20
      distant metastasis within 5 years after therapy (Figure<SUP> =
</SUP><A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F7">7</A>C).=20
      In contrast, 62% of patients in the good-prognosis subgroup<SUP>=20
      </SUP>remained metastasis-free (Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F7">7</A>C).=20
      The estimated hazard ratio<SUP> </SUP>for metastasis-free survival =
after=20
      therapy in the poor-prognosis<SUP> </SUP>subgroup as compared with =
the=20
      good-prognosis subgroup of patients<SUP> </SUP>defined by the =
11-gene=20
      signature was 3.762 (95% confidence interval<SUP> </SUP>of ratio,=20
      3.421=9620.27; <I>P</I> &lt; 0.0001). Thus, the expression<SUP>=20
      </SUP>pattern of the 11-gene MTTS/PNS signature is strongly=20
      predictive<SUP> </SUP>of a short postdiagnosis and post-treatment =
interval=20
      to distant<SUP> </SUP>metastases in early-stage breast cancer=20
      patients.<SUP> </SUP>
      <P>Next we asked whether expression analysis of the 11-gene =
signature<SUP>=20
      </SUP>would be informative in patients=92 stratification into<SUP> =

      </SUP>subgroups with distinct survival probability after therapy =
in<SUP>=20
      </SUP>a group of 125 patients diagnosed with lung adenocarcinoma =
(<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B34">34</A>).<SUP>=20
      </SUP>Similarly to the prostate and breast cancer patients, the=20
      Kaplan-Meier<SUP> </SUP>analysis shows that patients with tumors=20
      displaying a stem cell=96like<SUP> </SUP>expression profile of the =
11-gene=20
      signature have significantly<SUP> </SUP>higher risk of death after =
therapy=20
      and therefore can be defined<SUP> </SUP>as a poor-prognosis =
subgroup=20
      (Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F7">7</A>,=20
      E=96H). Median survival<SUP> </SUP>after therapy in the =
poor-prognosis=20
      subgroup of lung adenocarcinoma<SUP> </SUP>patients defined by the =
11-gene=20
      BMI-1=96pathway signature<SUP> </SUP>was 15.2 months (Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F7">7</A>G).=20
      In contrast, the median survival<SUP> </SUP>after therapy in the=20
      good-prognosis subgroup was 48.8 months.<SUP> </SUP>One hundred =
percent of=20
      patients in the poor-prognosis subgroup<SUP> </SUP>died within 3 =
years=20
      after therapy. Conversely, 58% of patients<SUP> </SUP>in the=20
      good-prognosis subgroup remained alive (Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F7">7</A>G).=20
      The<SUP> </SUP>estimated hazard ratio for death after therapy in =
the=20
      poor-prognosis<SUP> </SUP>subgroup as compared with the =
good-prognosis=20
      subgroup of patients<SUP> </SUP>defined by the 11-gene signature =
was 3.589=20
      (95% confidence interval<SUP> </SUP>of ratio, 2.910=9646.67; =
<I>P</I> =3D=20
      0.0005).<SUP> </SUP>
      <P>Next we examined whether the 11-gene MTTS/PNS signature =
would<SUP>=20
      </SUP>be useful in defining subgroups of patients diagnosed with =
an<SUP>=20
      </SUP>early-stage lung adenocarcinoma and having a statistically=20
      significant<SUP> </SUP>difference in survival probability after =
therapy.=20
      In the group<SUP> </SUP>of patients diagnosed with stage 1A lung=20
      adenocarcinoma (Figure<SUP> </SUP><A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F7">7</A>H),=20
      the median survival after therapy in the poor-prognosis<SUP>=20
      </SUP>subgroup defined by the 11-gene signature was 49.6 months.=20
      Fifty-three<SUP> </SUP>percent of patients in the poor-prognosis =
subgroup=20
      died within<SUP> </SUP>5 years after therapy. In contrast, 92% of =
patients=20
      remained<SUP> </SUP>alive in the good-prognosis subgroup (Figure =
<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F7">7</A>H).=20
      The estimated<SUP> </SUP>hazard ratio for death after therapy in =
the=20
      poor-prognosis subgroup<SUP> </SUP>as compared with the =
good-prognosis=20
      subgroup of patients defined<SUP> </SUP>by the 11-gene signature =
was 8.909=20
      (95% confidence interval<SUP> </SUP>of ratio, 1.418=9613.12; =
<I>P</I> =3D=20
      0.01).<SUP> </SUP>
      <P>Based on this analysis, we concluded that detection of a =
stem<SUP>=20
      </SUP>cell=96like expression profile of the 11-gene MTTS/PNS =
signature<SUP>=20
      </SUP>in primary tumors from patients diagnosed with early-stage=20
      prostate,<SUP> </SUP>breast, and lung carcinomas is associated =
with a high=20
      propensity<SUP> </SUP>toward metastatic dissemination and =
significantly=20
      higher risk<SUP> </SUP>of poor therapy outcome. Interestingly, =
therapy=20
      outcome in cancer<SUP> </SUP>patients diagnosed with other types =
of=20
      epithelial cancers, such<SUP> </SUP>as ovarian and bladder =
cancers, seems=20
      to manifest similar association<SUP> </SUP>with distinct patterns =
of=20
      expression of the 11-gene signature<SUP> </SUP>(Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F7">7</A>,=20
      I=96N).<SUP> </SUP>
      <P><FONT size=3D-1><STRONG>Expression of the 11-gene signature =
predicts=20
      therapy outcome in patients diagnosed with nonepithelial=20
      malignancies.</STRONG></FONT><BR>Altered BMI-1 expression was =
implicated=20
      recently in several<SUP> </SUP>nonepithelial malignancies, such as =
B cell=20
      non-Hodgkin lymphoma<SUP> </SUP>(<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B35">35</A>)=20
      and pediatric brain tumors (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B36">36</A>).=20
      We therefore sought to<SUP> </SUP>analyze whether the 11-gene =
MTTS/PNS=20
      signature would be useful<SUP> </SUP>in defining subgroups of =
patients=20
      diagnosed with nonepithelial<SUP> </SUP>cancers and having a =
statistically=20
      significant difference in<SUP> </SUP>survival probability after =
therapy.=20
      Using Kaplan-Meier method,<SUP> </SUP>we analyzed the prognostic =
power of=20
      the 11-gene signature in<SUP> </SUP>patients diagnosed with =
diffuse large=20
      B cell lymphoma, mantle<SUP> </SUP>cell lymphoma, acute myeloid =
leukemia,=20
      mesothelioma, medulloblastoma,<SUP> </SUP>and glioma (Table <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#T2">2</A>).=20
      Kaplan-Meier analysis demonstrates that<SUP> </SUP>a stem =
cell=96like=20
      expression profile of the 11-gene signature<SUP> </SUP>in primary =
tumors=20
      is a consistent powerful predictor of a therapy<SUP> </SUP>failure =
and=20
      short survival in cancer patients diagnosed with<SUP> </SUP>5 =
distinct=20
      types of nonepithelial cancers (Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F8">8</A>,=20
      A=96F).<SUP> </SUP>Consistent with our findings, an increased =
BMI-1=20
      expression<SUP> </SUP>in human medulloblastomas was demonstrated =
in a=20
      recent study<SUP> </SUP>(<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B37">37</A>).=20
      Taken together, these data seem to imply the presence<SUP> =
</SUP>of a=20
      conserved BMI-1=96associated pathway(s) similarly engaged<SUP> =
</SUP>in both=20
      neural stem cells and a highly malignant subset of human<SUP>=20
      </SUP>cancers diagnosed in a wide range of organs and uniformly=20
      exhibiting<SUP> </SUP>a marked propensity toward metastatic =
dissemination=20
      as well<SUP> </SUP>as a high probability of unfavorable therapy=20
      outcome.<SUP> </SUP>
      <P><A name=3DF8><!-- null --></A><BR clear=3Dall>
      <CENTER>
      <TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD>
            <TABLE cellSpacing=3D2 cellPadding=3D2>
              <TBODY>
              <TR bgColor=3D#e1e1e1>
                <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
                  =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503/F8"><IMG=20
                  height=3D141 alt=3D" " hspace=3D10=20
                  =
src=3D"http://www.jci.org/content/vol115/issue6/images/small/JCI0523412.f=
8.gif"=20
                  width=3D200 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
                  version</STRONG> (37K):<BR><NOBR><A=20
                  =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503/F8">[in=20
                  this window]</A><BR><A=20
                  onmouseover=3D"window.status=3D'View figure in a =
separate window'; return true"=20
                  onclick=3D"startTarget('F8', 590, 511); =
this.href=3D'/cgi/content-nw/full/115/6/1503/F8'"=20
                  =
href=3D"http://www.jci.org/cgi/content-nw/full/115/6/1503/F8"=20
                  target=3DF8>[in a new window]</A><BR>&nbsp;</NOBR> =
</TD>
                <TD vAlign=3Dtop align=3Dleft><STRONG><B>Figure 8</B>=20
                  </STRONG><SUP></SUP><BR>Classification of cancer =
patients=20
                  diagnosed with different types of nonepithelial =
malignancies=20
                  into subgroups with distinct therapy outcome based on=20
                  expression profile of the 11-gene MTTS/PNS signature.=20
                  Kaplan-Meier survival analysis of the probability of a =
therapy=20
                  failure in cancer patients diagnosed with different =
types of=20
                  nonepithelial cancers and having distinct expression =
profiles=20
                  of the 11-gene MTTS/PNS signature is shown. Data from =
lymphoma=20
                  patients (<B>A</B>), malignant glioma patients =
(<B>B</B>),=20
                  mesothelioma patients (<B>C</B>), medulloblastoma =
patients=20
                  (<B>D</B>), mantle cell lymphoma patients (<B>E</B>), =
and=20
                  acute myeloid leukemia patients (<B>F</B>) are shown.
                  =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR><A=20
      name=3DSEC3><!-- null --></A><BR clear=3Dright>
      <TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" =
bgColor=3D#e1e1e1>
        <TBODY>
        <TR>
          <TD vAlign=3Dcenter align=3Dleft width=3D"5%" =
bgColor=3D#ffffff><IMG=20
            height=3D21 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/rarrow.gif" =
width=3D10></TD>
          <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
            Discussion </FONT></TH></TR></TBODY></TABLE>
      <TABLE cellPadding=3D5 align=3Dright border=3D1>
        <TBODY>
        <TR>
          <TH align=3Dleft><FONT size=3D-1><A=20
            =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#top"><IMG=20
            height=3D9 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/uarrow.gif" width=3D11=20
            border=3D0>Top<BR></A><A=20
            =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#ABS"><IMG=20
            height=3D9 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/uarrow.gif" width=3D11=20
            border=3D0>Abstract<BR></A><A=20
            =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#SEC1"><IMG=20
            height=3D9 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/uarrow.gif" width=3D11=20
            border=3D0>Introduction<BR></A><A=20
            =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#SEC2"><IMG=20
            height=3D9 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/uarrow.gif" width=3D11=20
            border=3D0>Results<BR></A><IMG height=3D9 alt=3D" " =
hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/dot.gif" width=3D11 =
border=3D0><FONT=20
            color=3D#464c53>Discussion</FONT><BR><A=20
            =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#SEC4"><IMG=20
            height=3D9 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/darrow.gif" width=3D11=20
            border=3D0>Methods<BR></A><A=20
            =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#BIBL"><IMG=20
            height=3D9 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/darrow.gif" width=3D11=20
            =
border=3D0>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>A=
=20
      growing number of expression profiling studies provide =
experimental<SUP>=20
      </SUP>evidence indicating the presence of a transcriptionally=20
      distinct<SUP> </SUP>subtype of human solid tumors manifesting a =
marked=20
      propensity<SUP> </SUP>toward metastatic dissemination, highly =
malignant=20
      clinical behavior,<SUP> </SUP>and a high probability of poor =
therapy=20
      outcome in cancer patients<SUP> </SUP>diagnosed with early-stage=20
      carcinomas of various origins (refs.<SUP> </SUP><A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B15">15</A>,=20
      <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B38">38</A>-<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B40">40</A>;=20
      this study). These results are consistent with the<SUP> </SUP>idea =
that,=20
      at least in a subset of human solid tumors, the acquisition<SUP> =
</SUP>of=20
      full metastatic potential, including an emergence and seeding<SUP> =

      </SUP>of potent metastasis precursor cells, is a relatively =
early<SUP>=20
      </SUP>event in tumor progression. Collectively, these data =
suggest<SUP>=20
      </SUP>an early involvement, in development of this =
transcriptionally<SUP>=20
      </SUP>defined subtype of human carcinomas, of a highly malignant=20
      combination<SUP> </SUP>of mutant alleles conferring the proclivity =
to=20
      metastasize (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B40">40</A>)<SUP>=20
      </SUP>and/or an engagement of unique unconventional cellular =
targets<SUP>=20
      </SUP>such as stem cells and/or early progenitor cells in=20
      transformation<SUP> </SUP>and tumor progression.<SUP> </SUP>
      <P>One of the hallmark biological features of normal stem =
cells<SUP>=20
      </SUP>is the ability to fuse spontaneously in vitro and in vivo =
with<SUP>=20
      </SUP>other cell types, leading to formation of reprogrammed =
viable<SUP>=20
      </SUP>somatic cell hybrids (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B41">41</A>-<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B44">44</A>).=20
      Accumulation of normal stem cells<SUP> </SUP>in experimental =
tumors in=20
      vivo has been demonstrated in several<SUP> </SUP>studies (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B45">45</A>,=20
      <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B46">46</A>).=20
      Furthermore, most recent studies demonstrated<SUP> </SUP>that =
committed=20
      myelomonocytic cells such as macrophages can<SUP> </SUP>produce =
functional=20
      epithelial cells by in vivo fusion (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B47">47</A>),<SUP>=20
      </SUP>thus extending the number of cell types that might serve =
as<SUP>=20
      </SUP>hypothetically "eligible" fusion partners for tumor cells. =
It<SUP>=20
      </SUP>would be of interest to study how cancer cells co-opt stem=20
      cell=96like<SUP> </SUP>transcriptome into progression pathways and =
whether=20
      some human<SUP> </SUP>carcinomas could attract stem cells by =
mimicking a=20
      stem cell<SUP> </SUP>"niche" microenvironment, thus directly =
engaging=20
      normal stem<SUP> </SUP>cells into malignant process via cell =
fusion. One=20
      interesting<SUP> </SUP>endpoint of our analysis is that a =
relatively small=20
      set of coregulated<SUP> </SUP>transcripts appears to predict =
clinical=20
      outcome in a large number<SUP> </SUP>of human tumors representing =
10=20
      distinct types of cancer. Perhaps<SUP> </SUP>inclusion of a =
relevant=20
      biological model in the signature discovery<SUP> </SUP>protocol =
was an=20
      essential component of the successful hit selection,<SUP> =
</SUP>since=20
      recent metaanalysis of cancer microarray data that was<SUP> =
</SUP>based=20
      solely on statistical approaches did not identify an outcome<SUP>=20
      </SUP>signature common to multiple cancer types (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B48">48</A>).<SUP>=20
      </SUP>
      <P>It has been suggested that sets of coordinately expressed =
genes<SUP>=20
      </SUP>defined as cancer-associated gene expression signatures =
might<SUP>=20
      </SUP>reflect the cell of origin of cancer (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B49">49</A>).=20
      Unlike stem cells<SUP> </SUP>in the state of CNS neurospheres that =
are=20
      recovered from the<SUP> </SUP>CNS, stem cells in the state of PNS=20
      neurospheres might be present<SUP> </SUP>in many (if not all) =
peripheral=20
      tissues and therefore are more<SUP> </SUP>likely and readily =
accessible=20
      cellular targets for direct involvement<SUP> </SUP>into malignant =
process.=20
      It remains to be elucidated whether<SUP> </SUP>the precision of =
analytical=20
      protocols used in this study was<SUP> </SUP>sufficient to identify =
the=20
      broadly applicable gene expression<SUP> </SUP>markers of the=20
      <I>BMI-1</I>-pathway activation and normal stem cell<SUP> =
</SUP>engagement=20
      in malignant progression of human cancers. Protein<SUP> =
</SUP>products of=20
      2 genes upregulated in the MTTS/PNS signature profile<SUP> =
</SUP>(BUB1 and=20
      HEC1) are known to play an important role in the spindle<SUP>=20
      </SUP>assembly mitotic checkpoint. A recent study suggested a =
novel<SUP>=20
      </SUP>mechanism leading to development of frequent aneuploidy in=20
      human<SUP> </SUP>cancer due to aberrant expression of Mad2 =
protein,=20
      inappropriate<SUP> </SUP>activation of the spindle checkpoint, =
and,=20
      eventually, aneuploidy<SUP> </SUP>(<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B50">50</A>).=20
      Both BUB1 and HEC1 proteins play a key role in the assembly<SUP> =
</SUP>of=20
      checkpoint proteins, being required for Mad2 recruitment<SUP> =
</SUP>to the=20
      kinetochores (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B51">51</A>,=20
      <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B52">52</A>);=20
      this suggests that aberrant BUB1<SUP> </SUP>and HEC1 expression =
might=20
      contribute to and/or reflect the altered<SUP> </SUP>function of =
the=20
      mitotic checkpoint in metastatic cancer cells.<SUP> </SUP>
      <P>In conclusion, using a mouse/human comparative =
translational<SUP>=20
      </SUP>genomics approach, we identified an 11-gene signature that=20
      consistently<SUP> </SUP>displays a stem cell=96like expression =
pattern in=20
      metastatic<SUP> </SUP>lesions of prostate carcinomas recovered =
from=20
      multiple distant<SUP> </SUP>target organs. Our results indicate =
that a=20
      stem cell=96resembling<SUP> </SUP>expression profile of the =
11-gene=20
      signature is associated with<SUP> </SUP>a highly malignant =
clinical course=20
      of disease progression and<SUP> </SUP>predicts high likelihood of =
therapy=20
      failure in multiple types<SUP> </SUP>of human cancer. =
Statistically=20
      significant negative prognostic<SUP> </SUP>value of a stem =
cell=96like=20
      expression of the 11-gene signature<SUP> </SUP>in early-stage =
primary=20
      solid tumors of diverse origin suggests<SUP> </SUP>the presence of =
a=20
      genetically distinct subtype of human carcinomas<SUP> </SUP>with =
high=20
      propensity toward metastatic dissemination even at<SUP> </SUP>the =
early=20
      stage of disease progression. Further elucidation<SUP> </SUP>of =
possible=20
      causal relationships between activation of a stem<SUP>=20
      </SUP>cell=96resembling gene expression program and malignant<SUP> =

      </SUP>behavior of human carcinoma cells should have considerable=20
      theoretical<SUP> </SUP>and practical implications.<SUP> </SUP>
      <P><A name=3DSEC4><!-- null --></A><BR clear=3Dright>
      <TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" =
bgColor=3D#e1e1e1>
        <TBODY>
        <TR>
          <TD vAlign=3Dcenter align=3Dleft width=3D"5%" =
bgColor=3D#ffffff><IMG=20
            height=3D21 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/rarrow.gif" =
width=3D10></TD>
          <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
            Methods </FONT></TH></TR></TBODY></TABLE>
      <TABLE cellPadding=3D5 align=3Dright border=3D1>
        <TBODY>
        <TR>
          <TH align=3Dleft><FONT size=3D-1><A=20
            =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#top"><IMG=20
            height=3D9 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/uarrow.gif" width=3D11=20
            border=3D0>Top<BR></A><A=20
            =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#ABS"><IMG=20
            height=3D9 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/uarrow.gif" width=3D11=20
            border=3D0>Abstract<BR></A><A=20
            =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#SEC1"><IMG=20
            height=3D9 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/uarrow.gif" width=3D11=20
            border=3D0>Introduction<BR></A><A=20
            =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#SEC2"><IMG=20
            height=3D9 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/uarrow.gif" width=3D11=20
            border=3D0>Results<BR></A><A=20
            =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#SEC3"><IMG=20
            height=3D9 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/uarrow.gif" width=3D11=20
            border=3D0>Discussion<BR></A><IMG height=3D9 alt=3D" " =
hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/dot.gif" width=3D11 =
border=3D0><FONT=20
            color=3D#464c53>Methods</FONT><BR><A=20
            =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#BIBL"><IMG=20
            height=3D9 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/darrow.gif" width=3D11=20
            =
border=3D0>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR><=
FONT=20
      size=3D-1><STRONG>Clinical samples.</STRONG></FONT><BR>Expression =
profiling=20
      data of primary tumor samples obtained<SUP> </SUP>from 1,122 =
cancer=20
      patients representing therapy-outcome cohorts<SUP> </SUP>for 10 =
types of=20
      human cancer (Table <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#T2">2</A>)=20
      were analyzed in this<SUP> </SUP>study. Microarray analysis and =
associated=20
      clinical information<SUP> </SUP>for 32 clinical samples (23 =
primary=20
      prostate tumors and 9 distant<SUP> </SUP>metastatic lesions) used =
to=20
      delineate the expression profiles<SUP> </SUP>of human prostate =
cancer=20
      metastases were reported previously<SUP> </SUP>(<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B13">13</A>).=20
      Two clinical outcome sets comprising 21 (outcome set 1)<SUP> =
</SUP>and 79=20
      (outcome set 2) samples were used for analysis of the<SUP>=20
      </SUP>association of the therapy outcome with distinct =
expression<SUP>=20
      </SUP>profiles of the 11-gene signature. Original gene =
expression<SUP>=20
      </SUP>profiles of the 21 clinical samples analyzed in this study =
were<SUP>=20
      </SUP>reported elsewhere (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B14">14</A>).=20
      Primary gene expression data files<SUP> </SUP>of clinical samples =
as well=20
      as associated clinical information<SUP> </SUP>can be found at=20
      http://www-genome.wi.mit.edu/cancer/.<SUP> </SUP>
      <P>The prostate tumor tissues constituting the second =
clinical<SUP>=20
      </SUP>outcome set were obtained from 79 prostate cancer patients=20
      undergoing<SUP> </SUP>therapeutic or diagnostic procedures =
performed as=20
      part of routine<SUP> </SUP>clinical management at the MSKCC (New =
York, New=20
      York, USA).<SUP> </SUP>Clinical and pathological features of 79 =
prostate=20
      cancer cases<SUP> </SUP>constituting the validation outcome set =
are=20
      presented elsewhere<SUP> </SUP>(<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B15">15</A>).=20
      Median follow-up after therapy in this cohort of patients<SUP> =
</SUP>was=20
      70 months. Samples were snap-frozen in liquid nitrogen and<SUP>=20
      </SUP>stored at =9680=B0C. Each sample was examined =
histologically<SUP>=20
      </SUP>using H&amp;E-stained cryostat sections. Care was taken to=20
      remove<SUP> </SUP>nonneoplastic tissues from tumor samples. Cells =
of=20
      interest<SUP> </SUP>were manually dissected from the frozen block =
and=20
      other tissues<SUP> </SUP>trimmed away. All of the studies were =
approved by=20
      the MSKCC<SUP> </SUP>Institutional Review Board.<SUP> </SUP>
      <P>Expression analysis data for tumor samples obtained from =
125<SUP>=20
      </SUP>lung adenocarcinoma patients as well as associated =
clinical<SUP>=20
      </SUP>information were reported elsewhere (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B34">34</A>).=20
      Original work describing<SUP> </SUP>gene expression profiles of =
the set of=20
      97 clinical samples of<SUP> </SUP>early-stage breast cancer was =
reported=20
      elsewhere (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B33">33</A>).=20
      Primary<SUP> </SUP>gene expression data files of clinical samples =
as well=20
      as associated<SUP> </SUP>clinical information have been previously =

      described (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B33">33</A>).=20
      To<SUP> </SUP>date, our analysis includes 1,153 therapy-outcome =
samples=20
      from<SUP> </SUP>patients diagnosed with 11 distinct types of =
cancer (Table=20
      <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#T2">2</A>):<SUP>=20
      </SUP>prostate cancer (100 patients); breast cancer (97 =
patients);<SUP>=20
      </SUP>lung adenocarcinoma (211 patients); ovarian cancer (50=20
      patients);<SUP> </SUP>bladder cancer (31 patients); diffuse large =
B cell=20
      lymphoma<SUP> </SUP>(298 patients); mantle cell lymphoma (MCL, 92=20
      patients); mesothelioma<SUP> </SUP>(17 patients); medulloblastoma =
(60=20
      patients); glioma (50 patients);<SUP> </SUP>and acute myeloid =
leukemia=20
      (116 patients).<SUP> </SUP>
      <P><FONT size=3D-1><STRONG>Cell culture.</STRONG></FONT><BR>Cell =
lines used=20
      in this study were previously described (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B16">16</A>).<SUP>=20
      </SUP>The LNCap- and PC-3=96derived cell lines were developed<SUP> =
</SUP>by=20
      consecutive serial orthotopic implantation, either from =
metastases<SUP>=20
      </SUP>to the lymph node (for the LN series) or reimplanted from =
the<SUP>=20
      </SUP>prostate (Pro series). This procedure generated cell =
variants<SUP>=20
      </SUP>with differing tumorigenicity, frequency, and latency of=20
      regional<SUP> </SUP>lymph node metastasis (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B16">16</A>).=20
      Except where noted, cell lines were<SUP> </SUP>grown in RPMI1640=20
      supplemented with 10% FBS and gentamycin (GIBCO;<SUP> =
</SUP>Invitrogen=20
      Corp.) to 70=9680% confluence and subjected to<SUP> </SUP>serum =
starvation=20
      as described previously (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B16">16</A>),=20
      or maintained<SUP> </SUP>in fresh complete media, supplemented =
with 10%=20
      FBS.<SUP> </SUP>
      <P><FONT size=3D-1><STRONG>Anoikis assay.</STRONG></FONT><BR>Cells =
were=20
      harvested by 5-minute digestion with 0.25% trypsin/0.02%<SUP> =
</SUP>EDTA=20
      (Irvine Scientific), washed, and resuspended in serum-free<SUP>=20
      </SUP>medium. Cells at a concentration of 1.7 <FONT=20
      face=3Darial,helvetica>x</FONT> 10<SUP>5</SUP> cells per well<SUP> =
</SUP>in=20
      1 ml of serum-free medium were plated in 24-well Ultra Low<SUP>=20
      </SUP>Attachment polystyrene plates (Corning Inc.) and incubated =
at<SUP>=20
      </SUP>37=B0C and 5% CO<SUB>2</SUB> overnight. Viability of cell =
cultures=20
      subjected<SUP> </SUP>to anoikis assays was greater than 95% in a =
trypan=20
      blue dye<SUP> </SUP>exclusion test.<SUP> </SUP>
      <P><FONT size=3D-1><STRONG>Apoptosis =
assay.</STRONG></FONT><BR>Apoptotic=20
      cells were identified and quantified using the Annexin<SUP> =
</SUP>V-FITC=20
      kit (BD Biosciences =97 Pharmingen) according to<SUP> </SUP>the=20
      manufacturer=92s instructions. The following controls<SUP> =
</SUP>were used=20
      to set up compensation and quadrants: (a) unstained<SUP> =
</SUP>cells; (b)=20
      cells stained with Annexin V-FITC (no propidium iodine);<SUP> =
</SUP>and=20
      (c) cells stained with propidium iodine (no Annexin V-FITC).<SUP>=20
      </SUP>Each measurement was carried out in quadruplicate, and =
each<SUP>=20
      </SUP>experiment was repeated at least twice. Annexin =
V-FITC=96positive<SUP>=20
      </SUP>cells were scored as early apoptotic cells; both Annexin=20
      V-FITC=96<SUP> </SUP>and propidium iodine=96positive cells were =
scored as=20
      late<SUP> </SUP>apoptotic cells; unstained Annexin V-FITC=96 and=20
      propidium<SUP> </SUP>iodine=96negative cells were scored as viable =
or=20
      surviving<SUP> </SUP>cells. In selected experiments, apoptotic =
cell death=20
      was documented<SUP> </SUP>using the TUNEL assay.<SUP> </SUP>
      <P><FONT size=3D-1><STRONG>Flow =
cytometry.</STRONG></FONT><BR>Cells were=20
      washed in cold PBS and stained using the Annexin<SUP> </SUP>V-FITC =

      Apoptosis Detection Kit (BD Biosciences) according to<SUP> =
</SUP>the=20
      manufacturer=92s instructions. Flow analysis was performed<SUP> =
</SUP>with a=20
      FACSCalibur instrument (BD Biosciences). CellQuest software<SUP> =
</SUP>(BD=20
      Biosciences) was used for data acquisition and analysis.<SUP> =
</SUP>All=20
      measurements were performed under the same instrument =
setting,<SUP>=20
      </SUP>analyzing 10<SUP>3</SUP>=9610<SUP>4</SUP> cells per =
sample.<SUP>=20
</SUP>
      <P><FONT size=3D-1><STRONG>Orthotopic=20
      xenografts.</STRONG></FONT><BR>Orthotopic xenografts of human =
prostate=20
      PC-3 cells and sublines<SUP> </SUP>used in this study were =
developed by=20
      surgical orthotopic implantation<SUP> </SUP>as previously =
described (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B15">15</A>,=20
      <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B16">16</A>).=20
      Briefly, 2 <FONT face=3Darial,helvetica>x</FONT> 10<SUP>6</SUP>=20
      cultured<SUP> </SUP>PC-3 cells or cells of the PC-3M or PC-3MLN4 =
subline=20
      were injected<SUP> </SUP>s.c. into male athymic mice, and allowed =
to=20
      develop into firm<SUP> </SUP>palpable and visible tumors over the =
course=20
      of 2=964 weeks.<SUP> </SUP>Intact tissue was harvested from a =
single s.c.=20
      tumor and surgically<SUP> </SUP>implanted in the ventral lateral =
lobes of=20
      the prostate gland<SUP> </SUP>in a series of 6 athymic mice per =
cell line=20
      subtype as described<SUP> </SUP>earlier (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B16">16</A>).<SUP>=20
      </SUP>
      <P><FONT size=3D-1><STRONG>Transgenic mouse model of prostate=20
      cancer.</STRONG></FONT><BR>A breeding colony of TRAMP (transgenic=20
      adenocarcinoma of the<SUP> </SUP>mouse prostate) mice is =
maintained on=20
      C57BL/6 background in<SUP> </SUP>the Animal Care Facility at the =
Sidney=20
      Kimmel Cancer Center<SUP> </SUP>(<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B53">53</A>).=20
      The TRAMP mouse colony is based on a breeding pair of<SUP> =
</SUP>TRAMP=20
      mice kindly provided by Norman Greenberg (Baylor College<SUP> =
</SUP>of=20
      Medicine, Houston, Texas, USA). Standard PCR assay was =
carried<SUP>=20
      </SUP>out to monitor the presence of the SV-40 large T antigen =
in<SUP>=20
      </SUP>new litters. Twenty-one PCR-confirmed male TRAMP mice were=20
      defined<SUP> </SUP>for microarray analysis carried out in this =
study.=20
      Animals were<SUP> </SUP>killed at different ages according to the=20
      established time course<SUP> </SUP>of the disease progression (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B32">32</A>),=20
      and prostates as well as primary<SUP> </SUP>and metastatic tumors =
were=20
      immediately removed and snap-frozen<SUP> </SUP>in liquid nitrogen. =

      Prostate tissues from age-matched wild-type<SUP> </SUP>C57BL/6 =
mice served=20
      as control samples in our microarray analysis<SUP> </SUP>of the =
TRAMP=20
      model of prostate cancer. Necropsies with gross<SUP> =
</SUP>microscopic=20
      examination were carried out. All procedures were<SUP> =
</SUP>approved by=20
      the Sidney Kimmel Cancer Center Institutional Animal<SUP> =
</SUP>Care and=20
      Use Committee and followed Sidney Kimmel Cancer Center<SUP> =
</SUP>Standard=20
      Operating Procedures in accordance with the NIH Guide<SUP> =
</SUP>for the=20
      Care and Use of Laboratory Animals.<SUP> </SUP>
      <P><FONT size=3D-1><STRONG>Tissue processing for mRNA and RNA=20
      isolation.</STRONG></FONT><BR>Fresh-frozen orthotopic and =
transgenic=20
      primary tumors, metastases,<SUP> </SUP>and mouse prostates were =
examined=20
      by use of H&amp;E-stained<SUP> </SUP>frozen sections. Orthotopic =
tumors of=20
      all sublines exhibited<SUP> </SUP>similar morphology consisting of =
sheets=20
      of monotonous closely<SUP> </SUP>packed tumor cells with little =
evidence=20
      of differentiation,<SUP> </SUP>interrupted by only occasional =
zones of=20
      largely stromal components,<SUP> </SUP>vascular lakes, or =
lymphocytic=20
      infiltrates. Fragments of tumor<SUP> </SUP>judged free of these=20
      nonepithelial clusters were used for mRNA<SUP> </SUP>preparation. =
Frozen=20
      tissue (1=963 mm <FONT face=3Darial,helvetica>x</FONT> 1=963 mm) =
was<SUP>=20
      </SUP>submerged in liquid nitrogen in a ceramic mortar and =
ground<SUP>=20
      </SUP>to powder. The frozen tissue powder was dissolved and=20
      immediately<SUP> </SUP>processed for mRNA isolation using a =
FastTrack kit=20
      for mRNA<SUP> </SUP>extraction (Invitrogen Corp.) according to the =

      manufacturer=92s<SUP> </SUP>instructions.<SUP> </SUP>
      <P><FONT size=3D-1><STRONG>RNA and mRNA =
extraction.</STRONG></FONT><BR>For=20
      gene expression analysis, cells were harvested in lysis<SUP> =
</SUP>buffer=20
      2 hours after the last media change at 70=9680% confluence,<SUP> =
</SUP>and=20
      total RNA or mRNA was extracted using the RNeasy (QIAGEN)<SUP> =
</SUP>or=20
      FastTrack kit (Invitrogen Corp.). Cell lines were not split<SUP>=20
      </SUP>more than 5 times before RNA extraction, except where =
noted.<SUP>=20
      </SUP>
      <P><FONT size=3D-1><STRONG>Affymetrix =
arrays.</STRONG></FONT><BR>The=20
      protocol for mRNA quality control and gene expression =
analysis<SUP>=20
      </SUP>was that recommended by Affymetrix. In brief, =
approximately<SUP>=20
      </SUP>1 =B5g of mRNA was reverse-transcribed with an oligo-dT<SUP> =

      </SUP>primer that has a T7 RNA polymerase promoter at the 5' =
end.<SUP>=20
      </SUP>Second-strand synthesis was followed by complementary RNA=20
      (cRNA)<SUP> </SUP>production incorporating a biotinylated base.=20
      Hybridization<SUP> </SUP>to Affymetrix U95Av2 arrays representing =
12,625=20
      transcripts<SUP> </SUP>overnight for 16 hours was followed by =
washing and=20
      labeling<SUP> </SUP>using a fluorescently labeled antibody. The =
arrays=20
      were read<SUP> </SUP>and data processed using Affymetrix equipment =
and=20
      software as<SUP> </SUP>reported previously (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B13">13</A>,=20
      <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B15">15</A>,=20
      <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B16">16</A>).<SUP>=20
      </SUP>
      <P><FONT size=3D-1><STRONG>Data =
analysis.</STRONG></FONT><BR>Detailed=20
      protocols for data analysis and documentation of the<SUP>=20
      </SUP>sensitivity, reproducibility, and other aspects of the=20
      quantitative<SUP> </SUP>statistical microarray analysis using =
Affymetrix=20
      technology<SUP> </SUP>have been reported previously (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B15">15</A>,=20
      <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B16">16</A>).=20
      Forty to fifty percent<SUP> </SUP>of the surveyed genes were =
called=20
      present by Affymetrix Microarray<SUP> </SUP>Suite version 5.0 =
software in=20
      these experiments. The concordance<SUP> </SUP>analysis of =
differential=20
      gene expression across the data sets<SUP> </SUP>was performed =
using=20
      Affymetrix MicroDB version 3.0 and DMT version<SUP> </SUP>3.0 =
software as=20
      described previously (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B13">13</A>,=20
      <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B15">15</A>,=20
      <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B16">16</A>).=20
      We processed<SUP> </SUP>the microarray data using the Affymetrix=20
      Microarray Suite version<SUP> </SUP>5.0 software and performed =
statistical=20
      analysis of the expression<SUP> </SUP>data set using the =
Affymetrix=20
      MicroDB and Affymetrix DMT software.<SUP> </SUP>The Pearson =
correlation=20
      coefficient for individual test samples<SUP> </SUP>and the =
appropriate=20
      reference standard were determined using<SUP> </SUP>Microsoft =
Excel=20
      version 2002 (Microsoft Corp.) and GraphPad<SUP> </SUP>Prism =
version 4.00=20
      software (GraphPad Software). We calculated<SUP> </SUP>the =
significance of=20
      the overlap between the lists of stem cell=96associated<SUP> =
</SUP>and=20
      prostate cancer=96associated genes by using the =
hypergeometric<SUP>=20
      </SUP>distribution test (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B54">54</A>).=20
      Analytical protocol of identification<SUP> </SUP>and validation of =
the=20
      11-gene BMI-1=96pathway signature<SUP> </SUP>is described below =
and=20
      presented in Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F3">3</A>.=20
      We used MultiExperiment<SUP> </SUP>Viewer (MEV) software version =
3.0.3 of=20
      the Institute for Genomic<SUP> </SUP>Research for SVM =
classification and=20
      TRN clustering algorithm<SUP> </SUP>data analysis and =
visualization.<SUP>=20
      </SUP>
      <P><FONT size=3D-1><STRONG>Protocol of discovery and validation of =
the=20
      11-gene BMI-1=96pathway signature.</STRONG></FONT><BR>We =
hypothesized that=20
      molecular signatures associated with activation<SUP> </SUP>of a =
normal=20
      stem cell=92s self-renewal and/or survival program<SUP> </SUP>in =
metastatic=20
      cancer cells might be detectable by looking for<SUP> </SUP>genes=20
      manifesting concordant patterns of regulation in distant<SUP>=20
      </SUP>metastatic lesions and stem cells in =
<I>Bmi-1<SUP>+/+</SUP></I>=20
      versus <I>Bmi-1<SUP>=96/=96</SUP></I><SUP> </SUP>genetic =
backgrounds.=20
      Therefore, we sought to determine whether<SUP> </SUP>expression =
profiles=20
      of transcripts activated and suppressed<SUP> </SUP>in prostate =
cancer=20
      metastases would recapitulate the expression<SUP> </SUP>profile of =
the=20
      BMI-1=96regulated genes in neural stem cells,<SUP> </SUP>by =
comparing the=20
      sets of differentially regulated genes in search<SUP> </SUP>of=20
      intersection of lists for both up- and downregulated =
transcripts.<SUP>=20
      </SUP>Thus, according to this model the primary criterion for=20
      transcript<SUP> </SUP>selection should be the concordance of =
changes in=20
      expression<SUP> </SUP>rather than a magnitude of changes (e.g., =
fold=20
      change). One<SUP> </SUP>of the predictions of this model is that=20
      transcripts of interest<SUP> </SUP>would be expected to have a =
tightly=20
      controlled "rank order"<SUP> </SUP>of expression within a cluster =
of=20
      coregulated genes, reflecting<SUP> </SUP>a balance of up- and=20
      downregulated mRNAs as a desired regulatory<SUP> </SUP>endpoint in =
a cell.=20
      A degree of resemblance of the transcript-abundance<SUP> =
</SUP>rank order=20
      within a gene cluster between a test sample and reference<SUP>=20
      </SUP>standard is measured by a Pearson correlation coefficient =
and<SUP>=20
      </SUP>designated as a phenotype association index (PAI). Samples =
with<SUP>=20
      </SUP>stem cell=96resembling expression profiles of PAI =
(SPAIs)<SUP>=20
      </SUP>are expected to have positive values of Pearson =
correlation<SUP>=20
      </SUP>coefficients. Detailed prognostic signature identification =
and<SUP>=20
      </SUP>validation protocol are described below and shown in =
Figure<SUP>=20
      </SUP><A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F3">3</A>.<SUP>=20
      </SUP>
      <P><FONT size=3D-1><STRONG>Step 1.</STRONG></FONT><BR>Sets of =
differentially=20
      regulated transcripts were independently<SUP> </SUP>identified for =
distant=20
      metastatic lesions and primary prostate<SUP> </SUP>tumors versus=20
      age-matched control samples in a transgenic TRAMP<SUP> </SUP>mouse =
model=20
      of metastatic prostate cancer (MTTS signature) as<SUP> </SUP>well =
as PNS=20
      (PNS signature) and CNS (CNS signature) neurospheres<SUP> </SUP>in =

      <I>BMI-1<SUP>+/+</SUP></I> versus <I>BMI-1<SUP>=96/=96</SUP></I> =
backgrounds=20
      using the<SUP> </SUP>Affymetrix microarray processing and =
statistical=20
      analysis software<SUP> </SUP>package (Affymetrix Microarray Suite =
version=20
      5.0, MicroDB version<SUP> </SUP>3.0, and DMT version 3.0) as =
described=20
      above and in previous<SUP> </SUP>publications (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B15">15</A>,=20
      <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B16">16</A>).=20
      Transcripts with negative signal-intensity<SUP> </SUP>values in =
both=20
      experimental and control sets were eliminated<SUP> </SUP>from =
further=20
      consideration. At least 2-fold changes of the mRNA<SUP> =
</SUP>abundance=20
      levels in experimental versus control samples for<SUP> </SUP>both=20
      upregulated and downregulated genes were required for =
inclusion<SUP>=20
      </SUP>in the lists of differentially regulated transcripts. Fold=20
      expression<SUP> </SUP>changes of the mRNA abundance levels for =
each=20
      transcript were<SUP> </SUP>calculated as ratios of the average =
intensity=20
      values for a given<SUP> </SUP>transcript in experimental versus =
control=20
      samples for both upregulated<SUP> </SUP>and downregulated genes =
and=20
      log<SUB>10</SUB>-transformed for further analysis.<SUP> =
</SUP>Thus, this=20
      analytical step defined 3 large parent signatures<SUP> </SUP>(see =
Figure=20
      <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F3">3</A>):=20
      MTTS signature comprising 868 upregulated and<SUP> </SUP>477 =
downregulated=20
      transcripts; PNS signature comprising 885<SUP> </SUP>upregulated =
and 1,088=20
      downregulated transcripts; and CNS signature<SUP> </SUP>comprising =
769=20
      upregulated and 778 downregulated transcripts.<SUP> </SUP>
      <P><FONT size=3D-1><STRONG>Step 2.</STRONG></FONT><BR>Subsets of =
transcripts=20
      exhibiting concordant expression changes<SUP> </SUP>in metastatic =
TRAMP=20
      tumor samples (MTTS signature) as well as<SUP> </SUP>PNS (PNS =
signature)=20
      and CNS (CNS signature) neurospheres in<SUP>=20
      </SUP><I>BMI-1<SUP>+/+</SUP></I> versus =
<I>BMI-1<SUP>=96/=96</SUP></I>=20
      backgrounds were identified.<SUP> </SUP>Concordant lists of =
transcripts=20
      were obtained by intersecting<SUP> </SUP>the 2 lists each of =
upregulated=20
      and downregulated genes. Thus,<SUP> </SUP>2 concordant subsets of=20
      transcripts were identified corresponding<SUP> </SUP>to each =
binary=20
      comparison of metastatic TRAMP tumors and neural<SUP> </SUP>stem =
cell=20
      samples in a state of PNS and CNS neurospheres (141<SUP> =
</SUP>upregulated=20
      and 58 downregulated transcripts for PNS neurospheres<SUP> =
</SUP>[<I>r</I>=20
      =3D 0.7593; <I>P</I> &lt; 0.0001; Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F2">2</A>A]=20
      and 40 upregulated and<SUP> </SUP>24 downregulated transcripts for =
CNS=20
      neurospheres [<I>r</I> =3D 0.7679;<SUP> </SUP><I>P</I> &lt; =
0.0001]). A=20
      third concordant subset of 27 genes comprising<SUP> </SUP>15 =
upregulated=20
      and 12 downregulated transcripts was selected<SUP> </SUP>for =
intersection=20
      common to all 3 signatures (<I>r</I> =3D 0.8002; <I>P</I> =
&lt;<SUP>=20
      </SUP>0.0001).<SUP> </SUP>
      <P><FONT size=3D-1><STRONG>Step 3.</STRONG></FONT><BR>Selection of =
small=20
      gene clusters was performed from subsets<SUP> </SUP>of genes =
exhibiting=20
      concordant changes of transcript-abundance<SUP> </SUP>behavior in=20
      metastatic TRAMP tumor samples and PNS and CNS neurospheres<SUP> =
</SUP>in=20
      <I>BMI-1<SUP>+/+</SUP></I> versus <I>BMI-1<SUP>=96/=96</SUP></I> =
backgrounds.=20
      Expression<SUP> </SUP>profiles were presented as log<SUB>10</SUB> =
average=20
      fold changes for each<SUP> </SUP>transcript and processed for=20
      visualization and Pearson correlation<SUP> </SUP>analysis using =
Microsoft=20
      Excel software (Microsoft Corp.). For<SUP> </SUP>the concordant=20
      differentially expressed genes, vectors of log<SUB>10</SUB><SUP>=20
      </SUP>average fold change were determined for both experimental=20
      settings,<SUP> </SUP>and the correlation between 2 vectors was =
determined.=20
      Practical<SUP> </SUP>considerations essential for future =
development of=20
      genetic diagnostic<SUP> </SUP>tests prompted us to select from =
concordant=20
      gene sets small<SUP> </SUP>gene expression signatures comprising=20
      transcripts with a high<SUP> </SUP>level of expression correlation =
in=20
      metastatic cancer cells and<SUP> </SUP>stem cells. The concordant =
list of=20
      differentially expressed<SUP> </SUP>genes was reduced by removing =
those=20
      genes whose removal led<SUP> </SUP>to the largest increase in the=20
      correlation coefficient. The<SUP> </SUP>reduction in the signature =

      transcript number was terminated<SUP> </SUP>when further =
elimination of a=20
      transcript did not increase the<SUP> </SUP>value of the Pearson=20
      correlation coefficient. The cutoff criterion<SUP> </SUP>for =
signature=20
      reduction was arbitrarily set to exceed a Pearson<SUP> =
</SUP>correlation=20
      coefficient of 0.95 (<I>P</I> &lt; 0.0001). Using this<SUP>=20
      </SUP>approach, a single candidate prognostic gene expression=20
      signature<SUP> </SUP>was selected for each intersection of the =
MTTS=20
      signature and<SUP> </SUP>parent stem cell signatures (Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F3">3</A>).=20
      Thus, 3 highly concordant<SUP> </SUP>small signatures were =
identified=20
      corresponding to 3 concordant<SUP> </SUP>subsets of genes defined =
in step=20
      2 (a set of 11 genes comprising<SUP> </SUP>8 upregulated and 3=20
      downregulated transcripts for PNS neurospheres,<SUP> </SUP>i.e., =
the=20
      11-gene MTTS/PNS signature; a set of 11 genes comprising<SUP> =
</SUP>7=20
      upregulated and 4 downregulated transcripts for CNS =
neurospheres,<SUP>=20
      </SUP>i.e., the 11-gene MTTS/CNS signature; and a set of 14 =
genes<SUP>=20
      </SUP>comprising 8 upregulated and 6 downregulated transcripts, =
i.e.,<SUP>=20
      </SUP>the MTTS/PNS/CNS signature).<SUP> </SUP>
      <P><FONT size=3D-1><STRONG>Step 4.</STRONG></FONT><BR>The small =
signatures=20
      identified in step 3 (one 11-gene signature<SUP> </SUP>for the PNS =
set,=20
      one 11-gene signature for the CNS set, and<SUP> </SUP>one 14-gene=20
      signature for the common PNS/CNS set) were tested<SUP> </SUP>for =
the power=20
      to discriminate the metastatic phenotype (using<SUP> </SUP>1 mouse =

      prostate cancer data set and 1 human prostate cancer<SUP> =
</SUP>data set=20
      comprising primary and metastatic tumors) and therapy-outcome<SUP> =

      </SUP>classification performance (using human prostate cancer =
therapy<SUP>=20
      </SUP>outcome set 1). Three identified small signatures were=20
      evaluated<SUP> </SUP>for their ability to discriminate metastatic =
and=20
      primary prostate<SUP> </SUP>tumors in a TRAMP mouse model of =
prostate=20
      cancer, and clinical<SUP> </SUP>samples of 9 metastatic versus 23 =
primary=20
      prostate tumors as<SUP> </SUP>well as primary prostate tumors from =
21=20
      patients with distinct<SUP> </SUP>outcome after the therapy (8 =
recurrent=20
      and 13 nonrecurrent samples).<SUP> </SUP>To assess a potential =
diagnostic=20
      and prognostic relevance of<SUP> </SUP>small signatures, we =
calculated a=20
      Pearson correlation coefficient<SUP> </SUP>for each individual =
tumor=20
      sample by comparing the expression<SUP> </SUP>profiles of =
individual=20
      samples with the reference expression<SUP> </SUP>profile in either =
PNS or=20
      CNS neurospheres in <I>BMI-1<SUP>+/+</SUP></I> versus<SUP>=20
      </SUP><I>BMI-1<SUP>=96/=96</SUP></I> backgrounds. Fold expression =
changes=20
      in<SUP> </SUP>individual clinical samples were calculated for each =
gene=20
      as<SUP> </SUP>a ratio of the expression value in a given sample to =
the=20
      "average"<SUP> </SUP>expression value of the gene across the =
entire data=20
      set of clinical<SUP> </SUP>samples. For each data set, the vector=20
      (<I>X</I>) of average gene expression<SUP> </SUP>was determined, =
and then=20
      the relative expression vector (<I>R</I>)<SUP> </SUP>was =
determined for=20
      each sample (<I>R</I> =3D <I>X</I>/<I>X</I>). The relative =
expression<SUP>=20
      </SUP>vectors were log<SUB>10</SUB>-transformed and correlated =
with the=20
      fixed<SUP> </SUP>vectors of gene expression determined in step 3. =
Negative=20
      expression<SUP> </SUP>values were treated as missing data. Based =
on the=20
      expected correlation<SUP> </SUP>of expression profiles of =
identified gene=20
      clusters with stem<SUP> </SUP>cell=96like expression profiles, we =
named the=20
      corresponding<SUP> </SUP>correlation coefficients calculated for=20
      individual samples the<SUP> </SUP>SPAIs. We evaluated the =
prognostic power=20
      of identified small<SUP> </SUP>signatures based on their ability =
to=20
      discriminate metastatic<SUP> </SUP>versus primary tumors =
(criterion 1) and=20
      to segregate the patients<SUP> </SUP>with recurrent and =
nonrecurrent=20
      prostate tumors into distinct<SUP> </SUP>subgroups (criterion 2) =
and=20
      selected a single best-performing<SUP> </SUP>small signature for=20
      subsequent validation analysis (Figures<SUP> </SUP><A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F3">3</A>=20
      and <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F4">4</A>).=20
      Based on diagnostic and prognostic classification<SUP> =
</SUP>performance,=20
      a single best-performing 11-gene MTTS/PNS signature<SUP> </SUP>was =

      selected for further validation analysis (Figures <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F3">3</A>=20
      and<SUP> </SUP><A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F4">4</A>).=20
      The fixed numerical vector describing the stem cell=96like<SUP>=20
      </SUP>signature in 11 genes is shown in Supplemental Tables 2, =
3,<SUP>=20
      </SUP>and 5.<SUP> </SUP>
      <P><FONT size=3D-1><STRONG>Step 5.</STRONG></FONT><BR>To assess =
the=20
      incremental statistical power of the individual<SUP> </SUP>genetic =
and=20
      clinical covariates as predictors of therapy outcome<SUP> =
</SUP>and=20
      unfavorable prognosis in prostate cancer patients, we =
performed<SUP>=20
      </SUP>both univariate and multivariate Cox proportional hazard=20
      survival<SUP> </SUP>analyses (Table <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#T4">4</A>).<SUP>=20
      </SUP>
      <P><FONT size=3D-1><STRONG>Step 6.</STRONG></FONT><BR>To validate =
a survival=20
      prediction model based on the 11-gene<SUP> </SUP>MTTS/PNS =
signature, we=20
      tested the prognostic performance of<SUP> </SUP>the model in the =
multiple=20
      independent therapy-outcome data sets<SUP> </SUP>representing 5 =
epithelial=20
      and 5 nonepithelial cancers. We divided<SUP> </SUP>the patients =
within=20
      individual cohorts into a training set,<SUP> </SUP>which was used =
to=20
      select the cutoff threshold and to test the<SUP> </SUP>model, and =
a test=20
      set, which was used to evaluate the reproducibility<SUP> </SUP>of =
the=20
      classification performance. We used the training set<SUP> </SUP>to =
select=20
      the prognosis-discrimination cutoff value for a signature<SUP> =
</SUP>based=20
      on the highest level of statistical significance in =
patients=92<SUP>=20
      </SUP>stratification into poor- and good-prognosis groups as=20
      determined<SUP> </SUP>by the log-rank test (lowest <I>P</I> value =
and=20
      highest hazard ratio<SUP> </SUP>in the training set). Clinical =
samples=20
      having the Pearson correlation<SUP> </SUP>coefficient at or higher =
than=20
      the cutoff value were identified<SUP> </SUP>as having the =
poor-prognosis=20
      signature. Clinical samples with<SUP> </SUP>the Pearson =
correlation=20
      coefficient below the cutoff value were<SUP> </SUP>identified as =
having=20
      the good-prognosis signature. Each training<SUP> </SUP>set was =
used to=20
      estimate a threshold of the correlation coefficients<SUP> =
</SUP>before a=20
      survival analysis was performed. These thresholds are<SUP> =
</SUP>shown in=20
      the legends to Figures <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F6">6</A>=20
      and <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F7">7</A>.=20
      The same discrimination<SUP> </SUP>cutoff value was then applied =
to=20
      evaluate the reproducibility<SUP> </SUP>of the prognostic =
performance in=20
      the test set of patients. Lastly,<SUP> </SUP>we applied the model =
to the=20
      entire outcome set using the same<SUP> </SUP>cutoff threshold to =
confirm=20
      the classification performance.<SUP> </SUP>The average gene =
expression=20
      vectors were determined for each<SUP> </SUP>gene and applied =
separately on=20
      the training, test, and combined<SUP> </SUP>data sets. The =
training and=20
      test sets were balanced with respect<SUP> </SUP>to the total =
number of=20
      patients, negative and positive therapy<SUP> </SUP>outcomes, and =
the=20
      length of survival. For the breast cancer<SUP> </SUP>data set, we=20
      maintained the patients=92 distribution among<SUP> </SUP>training =
and test=20
      data sets described in the original publication<SUP> </SUP>(<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B33">33</A>).=20
      At this stage of the analysis, we did not carry out =
additional<SUP>=20
      </SUP>model training, development, or optimization steps, except =
for<SUP>=20
      </SUP>selection of a prognostic cutoff threshold in the training =
set.<SUP>=20
      </SUP>The same MTTS/PNS expression profile was consistently used=20
      throughout<SUP> </SUP>the study as a reference standard to =
quantify the=20
      Pearson correlation<SUP> </SUP>coefficients of the individual =
samples. The=20
      distribution of<SUP> </SUP>the patients in the training and =
validation=20
      sets as well as<SUP> </SUP>the threshold values that separate the =
samples=20
      into good- and<SUP> </SUP>poor-prognostic groups are shown in the =
legends=20
      to Figures <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F6">6</A><SUP>=20
      </SUP>and <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F7">7</A>.<SUP>=20
      </SUP>
      <P>The cohort of 97 breast cancer patients (shown together in =
Figure<SUP>=20
      </SUP><A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F7">7</A>C)=20
      was divided into a training set (78 patients; 34 poor =
prognosis<SUP>=20
      </SUP>and 44 good prognosis) (Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F7">7</A>A)=20
      and a test set (19 patients;<SUP> </SUP>12 poor prognosis and 7 =
good=20
      prognosis) (Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F7">7</A>B)=20
      as described<SUP> </SUP>in the original publication (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B33">33</A>).=20
      One hundred twenty-five lung<SUP> </SUP>cancer patients (shown =
together in=20
      Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F7">7</A>G)=20
      were divided into<SUP> </SUP>a training set (63 patients; 36 poor=20
      prognosis and 27 good prognosis)<SUP> </SUP>(Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F7">7</A>E)=20
      and a test set (62 patients; 35 poor prognosis and<SUP> </SUP>27 =
good=20
      prognosis) (Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F7">7</A>F).=20
      Thirty-seven ovarian cancer<SUP> </SUP>patients (shown together in =
Figure=20
      <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F7">7</A>K)=20
      were divided into a training<SUP> </SUP>set (19 patients; 8 poor =
prognosis=20
      and 11 good prognosis) (Figure<SUP> </SUP><A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F7">7</A>I)=20
      and a test set (18 patients; 7 poor prognosis and 11 good<SUP>=20
      </SUP>prognosis) (Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F7">7</A>J).=20
      Thirty-one bladder cancer patients (shown<SUP> </SUP>together in =
Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F7">7</A>N)=20
      were divided into a training set (16<SUP> </SUP>patients; 11 poor=20
      prognosis and 5 good prognosis) (Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F7">7</A>L)<SUP>=20
      </SUP>and a test set (15 patients; 10 poor prognosis and 5 good=20
      prognosis)<SUP> </SUP>(Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F7">7</A>M).=20
      The cutoff values used for classification were<SUP> </SUP>0.56, =
0.75,=20
      1.16, and 0.35 for breast, lung, ovarian, and bladder<SUP> =
</SUP>cancer=20
      data sets, respectively.<SUP> </SUP>
      <P><FONT size=3D-1><STRONG>Step 7.</STRONG></FONT><BR>We tested =
the model=20
      performance using various sample-stratification<SUP> =
</SUP>approaches,=20
      such as TRN clustering (Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F5">5</A>),=20
      SVM classification<SUP> </SUP>(Supplemental Table 4), and weighted =

      survival score algorithm<SUP> </SUP>(Figures <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F6">6</A>E=20
      and <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F7">7</A>D).=20
      We evaluated the therapy outcome=96predictive<SUP> </SUP>power of =
the=20
      11-gene model in a prostate cancer setting using<SUP> </SUP>a =
prognostic=20
      test based on an independent method of gene expression<SUP>=20
      </SUP>analysis, namely Q-RT-PCR (Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F6">6</A>F).=20
      In order to facilitate<SUP> </SUP>the evaluation of the 11-gene =
model, the=20
      average expression<SUP> </SUP>vector for different cancer types =
and the=20
      thresholds that separate<SUP> </SUP>the samples into good- and=20
      poor-prognostic groups are shown<SUP> </SUP>in Supplemental Table =
6.<SUP>=20
      </SUP>
      <P><FONT size=3D-1><STRONG>SPAI.</STRONG></FONT><BR>Definition of =
the=20
      Pearson correlation coefficient as a phenotype<SUP> =
</SUP>association=20
      index is based on highly concordant behavior of<SUP> </SUP>the =
11-gene=20
      signature between neural stem cells in the state<SUP> </SUP>of PNS =

      neurospheres and prostate cancer metastasis (Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F2">2</A>,<SUP>=20
      </SUP>C and D; <I>r</I> =3D 0.9897; <I>P</I> &lt; 0.0001). Values =
for a=20
      standard PNS<SUP> </SUP>neurosphere and for TRAMP metastasis were=20
      established as described<SUP> </SUP>in the signature discovery =
protocol=20
      and shown in Figure <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F2">2</A>D.<SUP>=20
      </SUP>They were used consistently throughout the study as =
uniform<SUP>=20
      </SUP>reference standards for measurements of Pearson =
correlation<SUP>=20
      </SUP>coefficients for clinical samples. A degree of resemblance =
of<SUP>=20
      </SUP>the transcript-abundance rank order within a gene cluster=20
      between<SUP> </SUP>a test sample and reference standard is =
measured by a=20
      Pearson<SUP> </SUP>correlation coefficient and designated as a =
PAI.=20
      Samples with<SUP> </SUP>stem cell=96resembling expression profiles =
of PAI=20
      (SPAIs)<SUP> </SUP>are expected to have positive values of Pearson =

      correlation<SUP> </SUP>coefficients.<SUP> </SUP>
      <P><FONT size=3D-1><STRONG>Random co-occurrence =
test.</STRONG></FONT><BR>We=20
      performed 10,000 permutations to test the likelihood that<SUP> =
</SUP>small=20
      11-gene signatures derived from the large MTTS signature<SUP> =
</SUP>would=20
      display high discrimination power to assess the significance<SUP> =
</SUP>at=20
      the 0.1% level. We carried out 10,000 permutations of small<SUP>=20
      </SUP>11-gene signatures derived from the large 1,345-gene MTTS=20
      signature<SUP> </SUP>and compared their sample-stratification =
power with=20
      that of<SUP> </SUP>the 11-gene MTTS/PNS signature. The=20
      classification-performance<SUP> </SUP>cutoff <I>P</I> values were=20
      established by application of a 2-tailed<SUP> </SUP>Student=92s =
<I>t</I>=20
      test to the 11-gene MTTS/PNS signature (<I>P</I><SUP> </SUP>=3D =
0.0005 for=20
      metastasis versus primary prostate cancer data<SUP> </SUP>set and =
<I>P</I>=20
      =3D 0.026 for recurrent versus nonrecurrent prostate<SUP> =
</SUP>cancer data=20
      set). Random concordant gene sets comprising approximately<SUP> =
</SUP>200=20
      transcripts were generated using a mouse transcriptome data<SUP> =
</SUP>set=20
      representing expression profiling data of approximately<SUP> =
</SUP>12,000=20
      transcripts across 38 normal tissues (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B55">55</A>).=20
      Inter- and<SUP> </SUP>intraspecies probe set match between =
different array=20
      types was<SUP> </SUP>performed at 95% or greater identity level =
using the=20
      Affymetrix<SUP> </SUP>database (www.affymetrix.com). To assess=20
      discrimination of random<SUP> </SUP>11-gene signatures derived =
from the=20
      1,345-gene MTTS signature,<SUP> </SUP>a 2-tailed Student=92s =
<I>t</I> test=20
      was carried out for metastatic<SUP> </SUP>versus primary prostate =
cancer=20
      data set (32 samples) and recurrent<SUP> </SUP>versus nonrecurrent =

      prostate cancer data set (21 samples). The<SUP> </SUP>signatures =
were=20
      ranked based on <I>P</I> values, and ranking metrics<SUP> </SUP>of =
each=20
      random 11-gene signature were compared with the 11-gene<SUP>=20
      </SUP>MTTS/PNS signature <I>P</I> values. We found that 10,000=20
      permutations<SUP> </SUP>generated 7 random 11-gene signatures =
performing=20
      at the sample-classification<SUP> </SUP>level of the 11-gene =
MTTS/PNS=20
      signature.<SUP> </SUP>
      <P><FONT size=3D-1><STRONG>Weighted survival predictor score=20
      algorithm.</STRONG></FONT><BR>We implemented the weighted survival =
score=20
      analysis to reflect<SUP> </SUP>the incremental statistical power =
of the=20
      individual covariates<SUP> </SUP>as predictors of therapy outcome =
based on=20
      a multicomponent prognostic<SUP> </SUP>model. The microarray-based =
or=20
      Q-RT-PCR=96derived gene expression<SUP> </SUP>values were =
normalized and=20
      log-transformed on a base 10 scale.<SUP> </SUP>The log-transformed =

      normalized expression values for each data<SUP> </SUP>set were =
analyzed in=20
      a multivariate Cox proportional hazard<SUP> </SUP>regression =
model, with=20
      overall survival or event-free survival<SUP> </SUP>as the =
dependent=20
      variable. To calculate the survival/prognosis<SUP> </SUP>predictor =
score=20
      for each patient, we multiplied the log-transformed<SUP> =
</SUP>normalized=20
      gene expression value measured for each gene by a<SUP> =
</SUP>coefficient=20
      derived from the multivariate Cox proportional hazard<SUP>=20
      </SUP>regression analysis. Final survival predictor score =
comprises<SUP>=20
      </SUP>a sum of scores for individual genes and reflects the =
relative<SUP>=20
      </SUP>contribution of each of the 11 genes in the multivariate=20
      analysis.<SUP> </SUP>The negative weighting values indicate that =
higher=20
      expression<SUP> </SUP>correlates with longer survival and =
favorable=20
      prognosis, whereas<SUP> </SUP>the positive score values indicate =
that=20
      higher expression correlates<SUP> </SUP>with poor outcome and =
shorter=20
      survival. Thus, the weighted survival<SUP> </SUP>predictor model =
is based=20
      on a cumulative score of the weighted<SUP> </SUP>expression values =
of 11=20
      genes. For example, the following equation<SUP> </SUP>describes =
the=20
      relapse-free survival predictor score for prostate<SUP> =
</SUP>cancer=20
      patients (see Table <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#T5">5</A>):=20
      relapse-free survival score =3D<SUP> </SUP>(=960.403 <FONT=20
      face=3Darial,helvetica>x</FONT> <I>Gbx2</I>) + (1.2494 <FONT=20
      face=3Darial,helvetica>x</FONT> <I>KI67</I>) + (=960.3105 <FONT=20
      face=3Darial,helvetica>x</FONT> <I>cyclin<SUP> </SUP>B1</I>) + =
(=960.1226=20
      <FONT face=3Darial,helvetica>x</FONT> <I>BUB1</I>) + (0.0077 <FONT =

      face=3Darial,helvetica>x</FONT> <I>HEC</I>) + (0.0369 <FONT=20
      face=3Darial,helvetica>x</FONT> <I>KIAA1063</I>)<SUP> </SUP>+ =
(=961.7493 <FONT=20
      face=3Darial,helvetica>x</FONT> <I>HCFC1</I>) + (=961.1853 <FONT=20
      face=3Darial,helvetica>x</FONT> <I>RNF2</I>) + (1.5242<SUP> =
</SUP><FONT=20
      face=3Darial,helvetica>x</FONT> <I>ANK3</I>) + (=960.5628 <FONT=20
      face=3Darial,helvetica>x</FONT> <I>FGFR2</I>) + (=960.4333 <FONT=20
      face=3Darial,helvetica>x</FONT> <I>CES1</I>).<SUP> </SUP>
      <P><FONT size=3D-1><STRONG>BMI-1 siRNA =
experiments.</STRONG></FONT><BR>The=20
      target siRNA SMART pools for <I>BMI-1</I> and control =
luciferase<SUP>=20
      </SUP>siRNAs were purchased from Dharmacon Research Inc. They =
were<SUP>=20
      </SUP>transfected into PC-3-32 human prostate carcinoma cells=20
      according<SUP> </SUP>to the manufacturer=92s protocols. Cell =
cultures were=20
      continuously<SUP> </SUP>monitored for growth and viability and =
assayed for=20
      mRNA expression<SUP> </SUP>levels of <I>BMI-1</I> and selected =
sets of=20
      genes (Table <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#T2">2</A>=20
      and Figure<SUP> </SUP><A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#F7">7</A>)=20
      using RT-PCR and Q-RT-PCR methods.<SUP> </SUP>
      <P><FONT size=3D-1><STRONG>Q-RT-PCR =
analysis.</STRONG></FONT><BR>The=20
      real-time PCR method measures the accumulation of PCR =
products<SUP>=20
      </SUP>with a fluorescence detector system and allows for=20
      quantification<SUP> </SUP>of the amount of amplified PCR products =
in the=20
      log phase of<SUP> </SUP>the reaction. Total RNA was extracted =
using RNeasy=20
      Mini Kit<SUP> </SUP>(QIAGEN) according to the manufacturer=92s=20
      instructions.<SUP> </SUP>A measure of 1 =B5g (tumor samples), or 2 =
=B5g and=20
      4<SUP> </SUP>=B5g (independent preparations of reference cDNA =
samples),<SUP>=20
      </SUP>of total RNA was used then as a template for cDNA =
synthesis<SUP>=20
      </SUP>with SuperScript II (Invitrogen Corp.). Q-RT-PCR primer=20
      sequences<SUP> </SUP>were selected for each cDNA with the aid of =
Primer=20
      Express software<SUP> </SUP>(Applied Biosystems). PCR =
amplification was=20
      performed with the<SUP> </SUP>gene-specific primers listed in =
Supplemental=20
      Table 1.<SUP> </SUP>
      <P>Q-RT-PCR reactions and measurements were performed with =
SYBR<SUP>=20
      </SUP>Green and ROX (Applied Biosystems) as a passive reference,=20
      using<SUP> </SUP>the ABI 7900HT Sequence Detection System (Applied =

      Biosystems).<SUP> </SUP>Conditions for the PCR were as follows: 1 =
cycle of=20
      10 minutes<SUP> </SUP>at 95=B0C; and 40 cycles of 0.20 minutes at =
94=B0C,=20
      0.20<SUP> </SUP>minutes at 60=B0C, and 0.30 minutes at 72=B0C. The =

      results<SUP> </SUP>were normalized to the relative amount of =
expression of=20
      an endogenous<SUP> </SUP>control gene, <I>GAPDH</I>.<SUP> </SUP>
      <P>Expression of mRNA for 11 genes (Supplemental Table 1) and =
an<SUP>=20
      </SUP>endogenous control gene (<I>GAPDH</I>) was measured by =
real-time=20
      PCR<SUP> </SUP>on an ABI PRISM 7900HT Sequence Detection System =
(Applied=20
      Biosystems)<SUP> </SUP>in 20 specimens of primary prostate cancer =
obtained=20
      from patients<SUP> </SUP>with documented PSA recurrence within 5 =
years=20
      after RP and patients<SUP> </SUP>who remained disease-free for at =
least 5=20
      years after RP (10<SUP> </SUP>patients in each group). For each =
gene, at=20
      least 2 sets of primers<SUP> </SUP>were tested, and the set-up =
with=20
      highest amplification efficiency<SUP> </SUP>was selected for the =
assay=20
      used in this study. Specificity of<SUP> </SUP>the assay for mRNA=20
      measurements was confirmed by the absence<SUP> </SUP>of the =
expected PCR=20
      products when genomic DNA was used as a<SUP> </SUP>template. =
<I>GAPDH</I>=20
      (5'-CCCTCAACGACCACTTTGTCA-3' and 5'-TTCCTCTTGTGCTCTTGCTGG-<SUP> =
</SUP>3')=20
      was used as the endogenous RNA and cDNA quantity =
normalization<SUP>=20
      </SUP>control. For calibration and generation of standard =
curves,<SUP>=20
      </SUP>we used several reference cDNAs: cDNA prepared from =
primary<SUP>=20
      </SUP>in vitro cultures of normal human prostate epithelial =
cells<SUP>=20
      </SUP>(<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B15">15</A>,=20
      <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B16">16</A>),=20
      cDNA derived from the PC-3M human prostate carcinoma<SUP> =
</SUP>cell line=20
      (<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B15">15</A>,=20
      <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B16">16</A>),=20
      and cDNA prepared from normal human prostate<SUP> </SUP>(<A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B15">15</A>,=20
      <A=20
      =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#B16">16</A>).=20
      Expression analysis of all genes was assessed in 2<SUP> =
</SUP>independent=20
      experiments using reference cDNAs to control for<SUP> =
</SUP>variations=20
      among different Q-RT-PCR experiments. Before statistical<SUP>=20
      </SUP>analysis, the normalized gene expression values were=20
      log-transformed<SUP> </SUP>(on a base 10 scale) similarly to the=20
      transformation of the<SUP> </SUP>array-based gene expression =
data.<SUP>=20
      </SUP>
      <P><FONT size=3D-1><STRONG>Survival =
analysis.</STRONG></FONT><BR>The=20
      Kaplan-Meier survival analysis was carried out using GraphPad<SUP> =

      </SUP>Prism version 4.00 software (GraphPad Software). The =
endpoint<SUP>=20
      </SUP>for survival analysis in prostate cancer was the =
biochemical<SUP>=20
      </SUP>recurrence defined by the serum PSA increase after =
therapy.<SUP>=20
      </SUP>Disease-free interval was defined as the time period =
between<SUP>=20
      </SUP>the date of RP and the date of PSA relapse (for the =
recurrence<SUP>=20
      </SUP>group) or the date of last follow-up (for the =
nonrecurrence<SUP>=20
      </SUP>group). Statistical significance of the difference between =
the<SUP>=20
      </SUP>survival curves for different groups of patients was =
assessed<SUP>=20
      </SUP>using <IMG alt=3D{chi} =
src=3D"http://www.jci.org/emath/khgr.gif"=20
      border=3D0><SUP>2</SUP> and log-rank tests. To evaluate the =
incremental=20
      statistical<SUP> </SUP>power of the individual covariates as =
predictors of=20
      therapy<SUP> </SUP>outcome and unfavorable prognosis, we performed =
both=20
      univariate<SUP> </SUP>and multivariate Cox proportional hazard =
survival=20
      analyses.<SUP> </SUP>
      <P><SUP></SUP>
      <P><SUP></SUP>
      <P><SUP></SUP>
      <P><SUP></SUP>
      <P><SUP></SUP>
      <P><SUP></SUP>
      <P><SUP></SUP>
      <P><SUP></SUP>
      <P><SUP></SUP>
      <P><SUP></SUP>
      <P><SUP></SUP>
      <P><SUP></SUP>
      <P><SUP></SUP>
      <P><SUP></SUP>
      <P><A name=3DACK><!-- null --></A><BR clear=3Dright>
      <TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" =
bgColor=3D#e1e1e1>
        <TBODY>
        <TR>
          <TD vAlign=3Dcenter align=3Dleft width=3D"5%" =
bgColor=3D#ffffff><IMG=20
            height=3D21 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/rarrow.gif" =
width=3D10></TD>
          <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
            Acknowledgments =
</FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>We thank C.=20
      Pettaway (M.D. Anderson Cancer Center, Houston,<SUP> </SUP>Texas, =
USA) for=20
      providing human prostate cancer cell lines and<SUP> </SUP>W. =
Sellers=20
      (Dana-Farber Cancer Institute, Boston, Massachusetts,<SUP> =
</SUP>USA) and=20
      W. Gerald (MSKCC, New York, New York, USA) for providing<SUP> =
</SUP>the=20
      Affymetrix CEL files of human prostate tumors and associated<SUP>=20
      </SUP>clinical information. We thank M. McClelland and J. Welsh =
for<SUP>=20
      </SUP>critical comments and technical and material assistance. =
We<SUP>=20
      </SUP>thank D. Mercola and A. Krones-Herzig for technical and=20
      logistical<SUP> </SUP>help with tissue acquisition and RNA =
extraction, and=20
      A. Sawyers<SUP> </SUP>and Y. Ivanova for excellent technical =
assistance.=20
      We thank<SUP> </SUP>W. Gerald (MSKCC, New York, New York, USA) and =
R. Bast=20
      (M.D.<SUP> </SUP>Anderson Cancer Center, Houston, Texas, USA) for=20
      providing the<SUP> </SUP>original microarray data files and =
associated=20
      clinical information.<SUP> </SUP>This work was supported in part =
by=20
      NIH/National Cancer Institute<SUP> </SUP>grant 5RO1 CA89827 (to =
G.V.=20
      Glinsky). This work was greatly<SUP> </SUP>facilitated by the use =
of=20
      previously published and publicly<SUP> </SUP>accessible research=20
      data.<SUP> </SUP>
      <P><A name=3DFN><!-- null --></A><BR clear=3Dright>
      <TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" =
bgColor=3D#e1e1e1>
        <TBODY>
        <TR>
          <TD vAlign=3Dcenter align=3Dleft width=3D"5%" =
bgColor=3D#ffffff><IMG=20
            height=3D21 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/rarrow.gif" =
width=3D10></TD>
          <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
            Footnotes </FONT></TH></TR></TBODY></TABLE>&nbsp;<BR><A =
name=3D""><!-- null --></A><B>Nonstandard abbreviations used:</B> MSKCC, =

      Memorial Sloan-Kettering<SUP> </SUP>Cancer Center; MTTS, =
metastatic TRAMP=20
      tumor sample; PAI, phenotype<SUP> </SUP>association index; PNS, =
peripheral=20
      nervous system; PSA, prostate-specific<SUP> </SUP>antigen; =
Q-RT-PCR,=20
      quantitative RT-PCR; RP, radical prostatectomy;<SUP> </SUP>siRNA, =
small=20
      interfering RNA; SPAI, stem cell=96like PAI;<SUP> </SUP>SVM, =
support vector=20
      machine; TRN, terrain.<SUP> </SUP>
      <P><B>Conflict of interest:</B> Gennadi V. Glinsky is a named=20
      inventor<SUP> </SUP>on a related patent application and serves as =
a=20
      consultant to<SUP> </SUP>Stratagene Inc. (La Jolla, California, =
USA) in=20
      the field of<SUP> </SUP>cancer biomarker development.<SUP> </SUP>
      <P><A name=3DBIBL><!-- null --></A><BR clear=3Dright>
      <TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" =
bgColor=3D#e1e1e1>
        <TBODY>
        <TR>
          <TD vAlign=3Dcenter align=3Dleft width=3D"5%" =
bgColor=3D#ffffff><IMG=20
            height=3D21 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/rarrow.gif" =
width=3D10></TD>
          <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
            References </FONT></TH></TR></TBODY></TABLE>
      <TABLE cellPadding=3D5 align=3Dright border=3D1>
        <TBODY>
        <TR>
          <TH align=3Dleft><FONT size=3D-1><A=20
            =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#top"><IMG=20
            height=3D9 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/uarrow.gif" width=3D11=20
            border=3D0>Top<BR></A><A=20
            =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#ABS"><IMG=20
            height=3D9 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/uarrow.gif" width=3D11=20
            border=3D0>Abstract<BR></A><A=20
            =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#SEC1"><IMG=20
            height=3D9 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/uarrow.gif" width=3D11=20
            border=3D0>Introduction<BR></A><A=20
            =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#SEC2"><IMG=20
            height=3D9 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/uarrow.gif" width=3D11=20
            border=3D0>Results<BR></A><A=20
            =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#SEC3"><IMG=20
            height=3D9 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/uarrow.gif" width=3D11=20
            border=3D0>Discussion<BR></A><A=20
            =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503?ijkey=3D84848e15a8=
e8ea0a94d19cc31537b1c6e80f1ce1#SEC4"><IMG=20
            height=3D9 alt=3D" " hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/uarrow.gif" width=3D11=20
            border=3D0>Methods<BR></A><IMG height=3D9 alt=3D" " =
hspace=3D5=20
            src=3D"http://www.jci.org/icons/toc/dot.gif" width=3D11 =
border=3D0><FONT=20
            =
color=3D#464c53>References</FONT><BR></FONT></TH></TR></TBODY></TABLE>&nb=
sp;<BR>
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clear=3Dall><FONT=20
      face=3D""><A name=3Drelation_type_2><!-- null --></A>
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cancer</STRONG>=20
        <DD>John P. Lahad, Gordon B. Mills, and Kevin R. Coombes<BR>J. =
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        <P></P></DD></DL></FONT><BR clear=3Dall><BR clear=3Dall><A =
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      <P><FONT size=3D+2><STRONG>This article has been cited by other=20
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          <TD vAlign=3Dtop noWrap width=3D499><A=20
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f"=20
            width=3D450 vspace=3D5 border=3D0><IMG height=3D16 =
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            src=3D"http://www.jci.org/icons/shared/search/homelink.gif" =
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            vspace=3D5 border=3D0></A><BR><FONT =
face=3Dverdana,arial,helvetica=20
            size=3D-1>A. L. Moharita, M. Taborga, K. E. Corcoran, M. =
Bryan, P. S.=20
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        <TR>
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            <HR align=3Dleft width=3D600 color=3D#828282 noShade =
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          <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 =
alt=3D""=20
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width=3D25><BR></TD>
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            Rechavi<BR><STRONG>Multiple Imprinted and Stemness Genes =
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          <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 =
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          <TD colSpan=3D6>
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          <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 =
alt=3D""=20
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width=3D25><BR></TD>
          <TD width=3D5><IMG height=3D5 alt=3D""=20
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          <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
            href=3D"http://stemcells.alphamedpress.org/"><IMG =
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          <TD vAlign=3Dtop noWrap width=3D499><A=20
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          <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 =
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width=3D25><BR></TD>
          <TD width=3D5><IMG height=3D5 alt=3D""=20
            src=3D"http://www.jci.org/icons/spacer.gif" width=3D5></TD>
          <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
            href=3D"http://www.pedresearch.org/"><IMG height=3D80 =
alt=3D"Home page"=20
            =
src=3D"http://www.pedresearch.org/portal_imgs/search_result.gif"=20
            width=3D59 vspace=3D5 border=3D1></A><BR></TD>
          <TD width=3D5><IMG height=3D5 alt=3D""=20
            src=3D"http://www.jci.org/icons/spacer.gif" width=3D5></TD>
          <TD vAlign=3Dtop noWrap width=3D499><A=20
            href=3D"http://www.pedresearch.org/"><IMG height=3D16=20
            alt=3D"Pediatr. Res."=20
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src=3D"http://www.jci.org/icons/shared/searchall/journals/pedresearch.gif=
"=20
            width=3D450 vspace=3D5 border=3D0><IMG height=3D16 =
alt=3D"Home page"=20
            src=3D"http://www.jci.org/icons/shared/search/homelink.gif" =
width=3D49=20
            vspace=3D5 border=3D0></A><BR><FONT =
face=3Dverdana,arial,helvetica=20
            size=3D-1>W. GUO, J. L. LASKY III, and H. =
WU<BR><STRONG>Cancer stem=20
            cells.</STRONG><BR>Pediatr. Res., April&nbsp;1,&nbsp;2006; =
59(4 Pt=20
            2): 59R - 64R. <BR><A=20
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href=3D"http://www.pedresearch.org/cgi/content/abstract/59/4_Part_2/59R">=
[Abstract]</A>=20
            <A=20
            =
href=3D"http://www.pedresearch.org/cgi/content/full/59/4_Part_2/59R">[Ful=
l=20
            Text]</A> <A=20
            =
href=3D"http://www.pedresearch.org/cgi/reprint/59/4_Part_2/59R">[PDF]</A>=
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            <BR><IMG height=3D1 alt=3D"" =
src=3D"http://www.jci.org/icons/spacer.gif"=20
            width=3D499> </FONT></TD>
          <TD width=3D5><IMG height=3D5 alt=3D""=20
            src=3D"http://www.jci.org/icons/spacer.gif" =
width=3D5></TD></TR>
        <TR>
          <TD colSpan=3D6>
            <HR align=3Dleft width=3D600 color=3D#828282 noShade =
SIZE=3D1>
          </TD></TR></TBODY></TABLE>
      <TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
        <TBODY>
        <TR bgColor=3D#d9d4c5>
          <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 =
alt=3D""=20
            src=3D"http://www.jci.org/icons/spacer.gif" =
width=3D25><BR></TD>
          <TD width=3D5><IMG height=3D5 alt=3D""=20
            src=3D"http://www.jci.org/icons/spacer.gif" width=3D5></TD>
          <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
            href=3D"http://cancerres.aacrjournals.org/"><IMG height=3D80 =

            alt=3D"Home page"=20
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src=3D"http://cancerres.aacrjournals.org/portal_imgs/search_result.gif"=20
            width=3D59 vspace=3D5 border=3D1></A><BR></TD>
          <TD width=3D5><IMG height=3D5 alt=3D""=20
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          <TD vAlign=3Dtop noWrap width=3D499><A=20
            href=3D"http://cancerres.aacrjournals.org/"><IMG height=3D16 =

            alt=3D"Cancer Res."=20
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src=3D"http://www.jci.org/icons/shared/searchall/journals/canres.gif"=20
            width=3D450 vspace=3D5 border=3D0><IMG height=3D16 =
alt=3D"Home page"=20
            src=3D"http://www.jci.org/icons/shared/search/homelink.gif" =
width=3D49=20
            vspace=3D5 border=3D0></A><BR><FONT =
face=3Dverdana,arial,helvetica=20
            size=3D-1>M. S. Wicha, S. Liu, and G. =
Dontu<BR><STRONG>Cancer Stem=20
            Cells: An Old Idea--A Paradigm Shift</STRONG><BR>Cancer =
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            February&nbsp;15,&nbsp;2006; 66(4): 1883 - 1890. <BR><A=20
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>[Abstract]</A>=20
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href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/4/1883">[Fu=
ll=20
            Text]</A> <A=20
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href=3D"http://cancerres.aacrjournals.org/cgi/reprint/66/4/1883">[PDF]</A=
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            <BR><IMG height=3D1 alt=3D"" =
src=3D"http://www.jci.org/icons/spacer.gif"=20
            width=3D499> </FONT></TD>
          <TD width=3D5><IMG height=3D5 alt=3D""=20
            src=3D"http://www.jci.org/icons/spacer.gif" =
width=3D5></TD></TR>
        <TR>
          <TD colSpan=3D6>
            <HR align=3Dleft width=3D600 color=3D#828282 noShade =
SIZE=3D1>
          </TD></TR></TBODY></TABLE>
      <TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
        <TBODY>
        <TR bgColor=3D#d9d4c5>
          <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 =
alt=3D""=20
            src=3D"http://www.jci.org/icons/spacer.gif" =
width=3D25><BR></TD>
          <TD width=3D5><IMG height=3D5 alt=3D""=20
            src=3D"http://www.jci.org/icons/spacer.gif" width=3D5></TD>
          <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
            href=3D"http://cancerres.aacrjournals.org/"><IMG height=3D80 =

            alt=3D"Home page"=20
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src=3D"http://cancerres.aacrjournals.org/portal_imgs/search_result.gif"=20
            width=3D59 vspace=3D5 border=3D1></A><BR></TD>
          <TD width=3D5><IMG height=3D5 alt=3D""=20
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          <TD vAlign=3Dtop noWrap width=3D499><A=20
            href=3D"http://cancerres.aacrjournals.org/"><IMG height=3D16 =

            alt=3D"Cancer Res."=20
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src=3D"http://www.jci.org/icons/shared/searchall/journals/canres.gif"=20
            width=3D450 vspace=3D5 border=3D0><IMG height=3D16 =
alt=3D"Home page"=20
            src=3D"http://www.jci.org/icons/shared/search/homelink.gif" =
width=3D49=20
            vspace=3D5 border=3D0></A><BR><FONT =
face=3Dverdana,arial,helvetica=20
            size=3D-1>R. P. Hill<BR><STRONG>Identifying Cancer Stem =
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            February&nbsp;15,&nbsp;2006; 66(4): 1891 - 1896. <BR><A=20
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>[Abstract]</A>=20
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ll=20
            Text]</A> <A=20
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href=3D"http://cancerres.aacrjournals.org/cgi/reprint/66/4/1891">[PDF]</A=
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            <BR><IMG height=3D1 alt=3D"" =
src=3D"http://www.jci.org/icons/spacer.gif"=20
            width=3D499> </FONT></TD>
          <TD width=3D5><IMG height=3D5 alt=3D""=20
            src=3D"http://www.jci.org/icons/spacer.gif" =
width=3D5></TD></TR>
        <TR>
          <TD colSpan=3D6>
            <HR align=3Dleft width=3D600 color=3D#828282 noShade =
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        <TR bgColor=3D#d9d4c5>
          <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 =
alt=3D""=20
            src=3D"http://www.jci.org/icons/spacer.gif" =
width=3D25><BR></TD>
          <TD width=3D5><IMG height=3D5 alt=3D""=20
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          <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
            href=3D"http://nar.oxfordjournals.org/"><IMG height=3D80 =
alt=3D"Home page"=20
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            width=3D59 vspace=3D5 border=3D1></A><BR></TD>
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            width=3D450 vspace=3D5 border=3D0><IMG height=3D16 =
alt=3D"Home page"=20
            src=3D"http://www.jci.org/icons/shared/search/homelink.gif" =
width=3D49=20
            vspace=3D5 border=3D0></A><BR><FONT =
face=3Dverdana,arial,helvetica=20
            size=3D-1>K. Nowak, K. Kerl, D. Fehr, C. Kramps, C. Gessner, =
K.=20
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href=3D"http://nar.oxfordjournals.org/cgi/reprint/34/6/1745">[PDF]</A>=20
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          <TD colSpan=3D6>
            <HR align=3Dleft width=3D600 color=3D#828282 noShade =
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        <TR bgColor=3D#d9d4c5>
          <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 =
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width=3D25><BR></TD>
          <TD width=3D5><IMG height=3D5 alt=3D""=20
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          <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
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face=3Dverdana,arial,helvetica=20
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advances on=20
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width=3D5></TD></TR>
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            <HR align=3Dleft width=3D600 color=3D#828282 noShade =
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        <TR bgColor=3D#d9d4c5>
          <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 =
alt=3D""=20
            src=3D"http://www.jci.org/icons/spacer.gif" =
width=3D25><BR></TD>
          <TD width=3D5><IMG height=3D5 alt=3D""=20
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          <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
            href=3D"http://clincancerres.aacrjournals.org/"><IMG =
height=3D80=20
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            vspace=3D5 border=3D0></A><BR><FONT =
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">[Full=20
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F]</A>=20
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width=3D5></TD></TR>
        <TR>
          <TD colSpan=3D6>
            <HR align=3Dleft width=3D600 color=3D#828282 noShade =
SIZE=3D1>
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        <TBODY>
        <TR bgColor=3D#d9d4c5>
          <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 =
alt=3D""=20
            src=3D"http://www.jci.org/icons/spacer.gif" =
width=3D25><BR></TD>
          <TD width=3D5><IMG height=3D5 alt=3D""=20
            src=3D"http://www.jci.org/icons/spacer.gif" width=3D5></TD>
          <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
            href=3D"http://www.jci.org/"><IMG height=3D80 alt=3D"Home =
page"=20
            src=3D"http://www.jci.org/portal_imgs/search_result.gif" =
width=3D59=20
            vspace=3D5 border=3D1></A><BR></TD>
          <TD width=3D5><IMG height=3D5 alt=3D""=20
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          <TD vAlign=3Dtop noWrap width=3D499><A =
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src=3D"http://www.jci.org/icons/shared/searchall/journals/jci.gif"=20
            width=3D450 vspace=3D5 border=3D0><IMG height=3D16 =
alt=3D"Home page"=20
            src=3D"http://www.jci.org/icons/shared/search/homelink.gif" =
width=3D49=20
            vspace=3D5 border=3D0></A><BR><FONT =
face=3Dverdana,arial,helvetica=20
            size=3D-1>J. P. Lahad, G. B. Mills, and K. R. =
Coombes<BR><STRONG>Stem=20
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Invest.,=20
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            <A =
href=3D"http://www.jci.org/cgi/content/full/115/6/1463">[Full=20
            Text]</A> <A=20
            href=3D"http://www.jci.org/cgi/reprint/115/6/1463">[PDF]</A> =
<BR><IMG=20
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src=3D"http://www.jci.org/icons/spacer.gif" width=3D499>=20
            </FONT></TD>
          <TD width=3D5><IMG height=3D5 alt=3D""=20
            src=3D"http://www.jci.org/icons/spacer.gif" =
width=3D5></TD></TR>
        <TR>
          <TD colSpan=3D6>
            <HR align=3Dleft width=3D600 color=3D#828282 noShade =
SIZE=3D1>
          </TD></TR></TBODY></TABLE><BR clear=3Dall>
      <TABLE class=3Dcontent_box_outer_table align=3Dright>
        <TBODY>
        <TR>
          <TD><!-- beginning of inner table -->
            <TABLE class=3Dcontent_box_inner_table><!-- citation -->
              <TBODY>
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                <TD class=3Dcontent_box_title_highlight colSpan=3D2>This =

                  Article<BR><SPAN style=3D"FONT-STYLE: normal">FREE, =
OPEN=20
                  ACCESS</SPAN></TD></TR>
              <TR>
                <TD class=3Dcontent_box_space_between_sections =
colSpan=3D2><IMG=20
                  height=3D1 alt=3D" " =
src=3D"http://www.jci.org/icons/spacer.gif"=20
                  width=3D200></TD></TR>
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                <TD class=3Dcontent_box_arrow vAlign=3Dtop =
width=3D4><IMG height=3D11=20
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                <TD class=3Dcontent_box_item><STRONG><A=20
                  =
href=3D"http://www.jci.org/cgi/content/abstract/115/6/1503?ijkey=3D84848e=
15a8e8ea0a94d19cc31537b1c6e80f1ce1">Abstract</A></STRONG>=20
                </TD></TR>
              <TR>
                <TD class=3Dcontent_box_arrow vAlign=3Dtop =
width=3D4><IMG height=3D11=20
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                <TD class=3Dcontent_box_item><STRONG><A=20
                  =
href=3D"http://www.jci.org/cgi/reprint/115/6/1503?ijkey=3D84848e15a8e8ea0=
a94d19cc31537b1c6e80f1ce1"><STRONG>Full=20
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                  =
href=3D"http://www.jci.org/cgi/content/full/115/6/1503/DC1">Supplemental =

                  data</A></STRONG> </TD></TR>
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href=3D"http://www.jci.org/cgi/eletter-submit/115/6/1503">Submit=20
                  a response</A></STRONG></STRONG> </TD></TR>
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