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Subject: Side Population Is Enriched in Tumorigenic, Stem-Like Cancer Cells, whereas ABCG2+ and ABCG2- Cancer Cells Are Similarly Tumorigenic -- Patrawala et al. 65 (14): 6207 -- Cancer Research
Date: Sat, 23 Feb 2008 11:38:52 +0100
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_type=3DGOOGLESCHOLARRELATED"=20
            target=3D_blank>Search for Related Content</A></STRONG> =
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          <TD class=3Dcontent_box_title colSpan=3D2>PubMed</TD></TR>
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            Citation</A></STRONG> </TD></TR>
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            =
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atrawala+L&amp;link_type=3DAUTHORSEARCH"=20
            target=3D_blank>Articles by Patrawala, L.</A></STRONG> =
</TD></TR>
        <TR>
          <TD class=3Dcontent_box_arrow vAlign=3Dtop width=3D4><IMG =
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            =
href=3D"http://cancerres.aacrjournals.org/cgi/external_ref?access_num=3DT=
ang+DG&amp;link_type=3DAUTHORSEARCH"=20
            target=3D_blank>Articles by Tang, D. G.</A></STRONG>=20
        =
</TD></TR></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE><FONT=20
size=3D-1>[<EM>Cancer Research</EM> 65, 6207-6219, July 15, 2005]<BR>=A9 =
2005 <A=20
href=3D"http://cancerres.aacrjournals.org/misc/terms.shtml">American =
Association=20
for Cancer Research</A> </FONT><BR>
<TABLE cellSpacing=3D0 cellPadding=3D0>
  <TBODY>
  <TR>
    <TD>
      <HR noShade SIZE=3D1>

      <H3>Cell and Tumor Biology</H3></TD></TR></TBODY></TABLE>
<H2>Side Population Is Enriched in Tumorigenic, Stem-Like Cancer Cells, =
whereas=20
ABCG2<SUP>+</SUP> and ABCG2<SUP>=96</SUP> Cancer Cells Are Similarly =
Tumorigenic=20
</H2><STRONG></NOBR><NOBR>Lubna Patrawala<SUP>1</SUP></NOBR>, =
<NOBR>Tammy=20
Calhoun<SUP>1</SUP></NOBR>, <NOBR>Robin =
Schneider-Broussard<SUP>1</SUP></NOBR>,=20
<NOBR>Jianjun Zhou<SUP>1</SUP></NOBR>, <NOBR>Kent =
Claypool<SUP>1</SUP></NOBR>=20
and <NOBR>Dean G. Tang<SUP>1</SUP><SUP>,2</SUP></NOBR> </STRONG>
<P><FONT size=3D-1><SUP>1</SUP> Department of Carcinogenesis, Science=20
Park-Research Division, The University of Texas M.D. Anderson Cancer =
Center,=20
Smithville, Texas and <SUP>2</SUP> Program in Environmental and =
Molecular=20
Carcinogenesis, Graduate School of Biomedical Sciences, Houston, Texas =
</FONT>
<P><FONT size=3D-1><B>Requests for reprints:</B> Dean Tang, Department =
of=20
Carcinogenesis, Science Park-Research Division, The University of Texas =
M.D.=20
Anderson Cancer Center, 1808 Park Road 1C, Smithville, TX 78957. Phone:=20
512-237-9575; Fax: 512-237-2475; E-mail: <SPAN=20
id=3Dem0>dtang{at}mdanderson.org</SPAN>
<SCRIPT type=3Dtext/javascript><!--=0A=
 var u =3D "dtang", d =3D "mdanderson.org"; =
document.getElementById("em0").innerHTML =3D '<a href=3D"mailto:' + u + =
'@' + d + '">' + u + '@' + d + '<\/a>'//--></SCRIPT>
.</FONT>
<P>
<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 =
height=3D21=20
      alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.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://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#top=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Top<BR></A><IMG height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/dot.gif" =
width=3D11=20
      border=3D0><FONT color=3D#464c53>Abstract</FONT><BR><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#SEC=
1"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Introduction<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#SEC=
2"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Materials and Methods<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#SEC=
3"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Results<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#SEC=
4"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Discussion<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#BIB=
L"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/darrow.gif" =
width=3D11=20
      =
border=3D0>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>R=
ecently,=20
several human cancers including leukemia and breast<SUP> </SUP>and brain =
tumors=20
were found to contain stem-like cancer cells<SUP> </SUP>called cancer =
stem cells=20
(CSC). Most of these CSCs were identified<SUP> </SUP>using markers that =
identify=20
putative normal stem cells. In some<SUP> </SUP>cases, stem-like cancer =
cells=20
were identified using the flow<SUP> </SUP>cytometry-based side =
population=20
technique. In this study, we<SUP> </SUP>first show that <IMG alt=3D~=20
src=3D"http://cancerres.aacrjournals.org/math/sim.gif" border=3D0>30% of =
cultured=20
human cancer cells and xenograft<SUP> </SUP>tumors examined (<IMG =
alt=3D~=20
src=3D"http://cancerres.aacrjournals.org/math/sim.gif" border=3D0>30 in =
total)=20
possess a detectable side population.<SUP> </SUP>Purified side =
population cells=20
from two cell lines (U373 glioma<SUP> </SUP>and MCF7 breast cancer) and =
a=20
xenograft prostate tumor (LAPC-9)<SUP> </SUP>are more tumorigenic than =
the=20
corresponding non=96side population<SUP> </SUP>cells. These side =
population cells=20
also possess some intrinsic<SUP> </SUP>stem cell properties as they =
generate=20
non=96side population<SUP> </SUP>cells <I>in vivo</I>, can be further=20
transplanted, and preferentially<SUP> </SUP>express some "stemness" =
genes,=20
including <I>Notch-1</I> and <I>=DF-catenin</I>.<SUP> </SUP>Because the =
side=20
population phenotype is mainly mediated by<SUP> </SUP>ABCG2, an =
ATP-binding=20
cassette half-transporter associated with<SUP> </SUP>multidrug =
resistance, we=20
subsequently studied ABCG2<SUP>+</SUP> and ABCG2<SUP>=96</SUP><SUP> =
</SUP>cancer=20
cells with respect to their tumorigenicity <I>in vivo</I>. Although<SUP> =

</SUP>side population cells show increased ABCG2 mRNA expression =
relative<SUP>=20
</SUP>to the non=96side population cells and all cancer cells<SUP> =
</SUP>and=20
xenograft tumors examined express ABCG2 in a small fraction<SUP> =
</SUP>(0.5-3%)=20
of the cells, highly purified ABCG2<SUP>+</SUP> cancer cells,<SUP>=20
</SUP>surprisingly, have very similar tumorigenicity to the=20
ABCG2<SUP>=96</SUP><SUP> </SUP>cancer cells. Mechanistic studies =
indicate that=20
ABCG2 expression<SUP> </SUP>is associated with proliferation and=20
ABCG2<SUP>+</SUP> cancer cells can<SUP> </SUP>generate =
ABCG2<SUP>=96</SUP> cells.=20
However, ABCG2<SUP>=96</SUP> cancer cells<SUP> </SUP>can also generate=20
ABCG2<SUP>+</SUP> cells. Furthermore, the ABCG2<SUP>=96</SUP><SUP> =
</SUP>cancer=20
cells form more and larger clones in the long-term clonal<SUP> =
</SUP>analyses=20
and the ABCG2<SUP>=96</SUP> population preferentially expresses<SUP> =
</SUP>several=20
"stemness" genes. Taken together, our results suggest<SUP> </SUP>that =
(a) the=20
side population is enriched with tumorigenic stem-like<SUP> </SUP>cancer =
cells,=20
(b) ABCG2 expression identifies mainly fast-cycling<SUP> </SUP>tumor=20
progenitors, and (c) the ABCG2<SUP>=96</SUP> population contains<SUP>=20
</SUP>primitive stem-like cancer cells.<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 =
height=3D21=20
      alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.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://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#top=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Top<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#ABS=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Abstract<BR></A><IMG height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/dot.gif" =
width=3D11=20
      border=3D0><FONT color=3D#464c53>Introduction</FONT><BR><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#SEC=
2"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Materials and Methods<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#SEC=
3"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Results<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#SEC=
4"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Discussion<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#BIB=
L"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/darrow.gif" =
width=3D11=20
      =
border=3D0>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>S=
tem=20
cells, which have now been found in multiple adult tissues<SUP> =
</SUP>and=20
organs, have several fundamental properties. First, they<SUP> </SUP>are=20
generally very rare. For example, the long-term hematopoietic<SUP> =
</SUP>stem=20
cells (LT-HSC) in mouse bone marrow constitute <IMG alt=3D~=20
src=3D"http://cancerres.aacrjournals.org/math/sim.gif" border=3D0>0.02% =
and<SUP>=20
</SUP>the short-term HCSs (ST-HSC) <IMG alt=3D~=20
src=3D"http://cancerres.aacrjournals.org/math/sim.gif" border=3D0>0.1% =
of the total=20
cells (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B1"=
>1</A>).=20
Second,<SUP> </SUP>stem cells in their normal microenvironment (i.e., =
niche)=20
rarely<SUP> </SUP>divide, although they possess tremendous proliferative =

potential<SUP> </SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B2"=
>2</A>).=20
Third, stem cells can self-renew; that is, they can regenerate<SUP>=20
</SUP>themselves when they divide to give rise to progenitor cells<SUP>=20
</SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B2"=
>2</A>).=20
Fourth, stem cells possess multipotential, oligopotential,<SUP> </SUP>or =

unipotential differentiation ability (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B3"=
>3</A>).=20
Many adult stem<SUP> </SUP>cells also seem to have the ability to=20
<I>trans</I>-differentiate into<SUP> </SUP>other cell types, although =
this=20
phenomenon is still being hotly<SUP> </SUP>debated (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B3"=
>3</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B4"=
>4</A>).=20
Finally, stem cells may express unique markers<SUP> </SUP>or properties =
that can=20
allow their enrichment and identification.<SUP> </SUP>
<P>Indeed, many stem cells are identified by their expression of<SUP>=20
</SUP>unique markers. For example, mouse LT-HSCs, ST-HSCs, and =
multipotent<SUP>=20
</SUP>progenitors can be identified and separated by their marker<SUP>=20
</SUP>phenotypes,=20
c-kit<SUP>hi</SUP>Sca-1<SUP>hi</SUP>Thy1.1<SUP>lo</SUP>Lin<SUP>=96/lo</SU=
P>Flk<SUP>=96</SUP>,=20
c-kit<SUP>hi</SUP>Sca-1<SUP>hi</SUP>Thy1.1<SUP>lo</SUP>Lin<SUP>=96/lo</SU=
P>Flk<SUP>+</SUP>,<SUP>=20
</SUP>and=20
c-kit<SUP>hi</SUP>Sca-1<SUP>hi</SUP>Thy1.1<SUP>=96</SUP>Lin<SUP>=96/lo</S=
UP>Flk<SUP>+</SUP>,=20
respectively<SUP> </SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B1"=
>1</A>).=20
Unfortunately, most organ-restricted stem cells or progenitors<SUP> =
</SUP>lack=20
unique and specific markers. One way to identify them relies<SUP> =
</SUP>on the=20
slow-cycling properties of stem cells. When pulsed by<SUP>=20
</SUP>bromodeoxyuridine (BrdU) for a period of time followed by =
"chasing"<SUP>=20
</SUP>for longer time intervals, slow-dividing stem cells will be<SUP>=20
</SUP>identified as label-retaining cells (LRC; refs. <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B2"=
>2</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B5"=
>5</A>).=20
The LRCs<SUP> </SUP>purified from the stem cell niche (i.e., the bulge =
in the=20
hair<SUP> </SUP>follicle) in transgenic animals possess many of the=20
expected<SUP> </SUP>stem cell properties (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B2"=
>2</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B5"=
>5</A>).=20
Another way to identify putative<SUP> </SUP>adult stem cells was =
pioneered by=20
Goodell et al. (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B6"=
>6</A>),=20
who observed<SUP> </SUP>that when bone marrow=96derived cells are =
incubated=20
with<SUP> </SUP>Hoechst dye 33342 and then analyzed by dual-wavelength =
flow<SUP>=20
</SUP>cytometry, a small population of cells does not accumulate an<SUP> =

</SUP>appreciable amount of dye and is thus identified as a=20
Hoechst<SUP>lo</SUP><SUP> </SUP>side population. Remarkably, the side =
population=20
is highly enriched<SUP> </SUP>in HSCs (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B6"=
>6</A>).=20
Since its initial application in bone marrow HSCs,<SUP> </SUP>the side=20
population technique has been adapted to identify putative<SUP> =
</SUP>stem cells=20
and progenitors in multiple tissues/organs including<SUP> =
</SUP>umbilical cord=20
blood (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B7"=
>7</A>),=20
skeletal muscle (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B8"=
>8</A>=96<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B10=
">10</A>),=20
mammary<SUP> </SUP>glands (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B11=
">11</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B12=
">12</A>),=20
lung (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B13=
">13</A>=96<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B15=
">15</A>),=20
liver (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B16=
">16</A>),=20
epidermis (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B17=
">17</A>,<SUP>=20
</SUP><A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B18=
">18</A>),=20
forebrain (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B19=
">19</A>),=20
testis (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B20=
">20</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B21=
">21</A>),=20
heart (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B22=
">22</A>),=20
kidney (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B23=
">23</A>),<SUP>=20
</SUP>limbal epithelium (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B24=
">24</A>),=20
and prostate (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B25=
">25</A>).<SUP>=20
</SUP>
<P>The side population=96enriched stem cells are rare (<IMG alt=3D~=20
src=3D"http://cancerres.aacrjournals.org/math/sim.gif" =
border=3D0>0.01-5%;<SUP>=20
</SUP>refs. <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B18=
">18</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B23=
">23</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B26=
">26</A>)=20
and heterogeneous, varying with tissue types,<SUP> </SUP>stages of =
development,=20
and methods of preparation (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B10=
">10</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B27=
">27</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B28=
">28</A>).<SUP>=20
</SUP>For example, the bone marrow side population cells contain =
not<SUP>=20
</SUP>only HSCs but also mesenchymal stem cells (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B29=
">29</A>)=20
and do not capture<SUP> </SUP>all HSCs (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B30=
">30</A>)=20
but only a subset of long-term repopulating HSCs<SUP> </SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B31=
">31</A>).=20
The skeletal muscle side population cells are composed<SUP> </SUP>of =
mostly bone=20
marrow=96derived cells (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B8"=
>8</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B9"=
>9</A>)=20
with only a<SUP> </SUP>minor population of resident muscle =
stem/progenitor cells=20
(i.e.,<SUP> </SUP>satellite cells). The lung side population cells are =
also=20
heterogeneous<SUP> </SUP>comprising both CD45<SUP>+</SUP> (i.e., bone =
marrow=20
derived) and CD45<SUP>=96</SUP><SUP> </SUP>cells (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B13=
">13</A>=96<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B15=
">15</A>).=20
Similarly, the testis side population cells<SUP> </SUP>may be enriched =
in=20
spermatogonial, germinal, as well as mesenchymal<SUP> </SUP>(i.e., =
Leydig) stem=20
cells (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B20=
">20</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B21=
">21</A>).=20
Although the side population<SUP> </SUP>cells in most cases seem =
enriched in=20
primitive stem cells, there<SUP> </SUP>are also reports that suggest =
that the=20
side population cells<SUP> </SUP>do not identify stem cells (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B17=
">17</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B18=
">18</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B32=
">32</A>).<SUP>=20
</SUP>
<P>The side population phenotype is mediated by the ABC family<SUP> =
</SUP>of=20
transporter proteins. One of the major mediators seems to<SUP> </SUP>be =
ABCG2 or=20
BCRP (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B33=
">33</A>),=20
which was initially identified in drug-selected<SUP> </SUP>MCF7 breast =
cancer=20
cells and later found to efflux multiple<SUP> </SUP>chemotherapeutic =
drugs and=20
xenobiotics (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B34=
">34</A>).=20
The strongest evidence<SUP> </SUP>linking ABCG2 and the side population=20
phenotype comes from the<SUP> </SUP>nearly complete loss of the bone =
marrow side=20
population phenotype<SUP> </SUP>in <I>abcg</I><SUP>=96/=96</SUP> mice =
(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B35=
">35</A>).=20
Other supporting evidence<SUP> </SUP>is that side population cells=20
preferentially express ABCG2 (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B13=
">13</A>,<SUP>=20
</SUP><A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B16=
">16</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B18=
">18</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B20=
">20</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B22=
">22</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B24=
">24</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B36=
">36</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B37=
">37</A>)=20
and that ABCG2 expression is detected<SUP> </SUP>in known =
stem/progenitor cells=20
such as HSCs (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B33=
">33</A>),=20
nestin-positive<SUP> </SUP>islet-derived progenitors (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B36=
">36</A>),=20
hepatic oval cells (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B16=
">16</A>),=20
limbal<SUP> </SUP>basal cells (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B24=
">24</A>),=20
and neural stem cell (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B38=
">38</A>).=20
On the other hand,<SUP> </SUP>it should be noted that only a fraction of =
the=20
side population<SUP> </SUP>cells expresses ABCG2 (e.g., ref. <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B24=
">24</A>)=20
and that both side population<SUP> </SUP>and known stem/progenitor cells =
also=20
express other ABC transporters<SUP> </SUP>such as MDR-1 (i.e., ABCB1 or=20
P-glycoprotein), MRP-1 (ABCC1),<SUP> </SUP>and ABCA2 (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B36=
">36</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B37=
">37</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B39=
">39</A>),=20
suggesting that these latter molecules<SUP> </SUP>may also be involved =
in=20
mediating the side population phenotype.<SUP> </SUP>In support, enforced =

expression of MDR-1 in murine bone marrow<SUP> </SUP>cells leads to the=20
expansion of the side population (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B40=
">40</A>).<SUP>=20
</SUP>
<P>Recently, several human cancers including leukemia (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B1"=
>1</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B41=
">41</A>)=20
and<SUP> </SUP>breast (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B42=
">42</A>)=20
and brain (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B37=
">37</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B43=
">43</A>=96<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B46=
">46</A>)=20
tumors were found to<SUP> </SUP>contain stem-like cells (SLC) called =
cancer stem=20
cell (CSCs;<SUP> </SUP>ref. <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B47=
">47</A>).=20
Most of these tumorigenic SLCs were identified using<SUP> </SUP>markers =
that=20
identify putative normal stem cells. Interestingly,<SUP> </SUP>SLCs have =
also=20
been identified in immortalized cell lines (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B39=
">39</A>),<SUP>=20
</SUP>long-term cultured cancer cells (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B37=
">37</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B48=
">48</A>),=20
or patient tumor samples<SUP> </SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B37=
">37</A>)=20
using the side population technique. These observations<SUP> =
</SUP>suggest that=20
even long-term cultured (cancer) cells may retain<SUP> </SUP>SLCs and =
that the=20
side population approach represents a valid<SUP> =
</SUP>marker-independent method=20
to identify such cells. In a recent<SUP> </SUP>study,<A =
name=3DRFN1></A><SUP><A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FN1=
">3</A></SUP>=20
we have also provided independent evidence for the existence<SUP> =
</SUP>of SLCs=20
in multiple human tumor cell cultures as well as xenograft<SUP> =
</SUP>tumors. In=20
the current study, we first seek to confirm the utility<SUP> </SUP>of =
the side=20
population technique to identify tumorigenic SLCs<SUP> </SUP>in cultured =
human=20
cancer cells and xenograft tumors. Then we<SUP> </SUP>focus on the =
question=20
whether the higher tumorigenicity associated<SUP> </SUP>with the side =
population=20
might be related to the expression<SUP> </SUP>of ABCG2, a major mediator =
of the=20
side population phenotype<SUP> </SUP>in bone marrow cells. Our results=20
surprisingly show that in<SUP> </SUP>contrast to the tumorigenic =
differences=20
between the side population<SUP> </SUP>and non=96side population cells, =
the=20
ABCG2<SUP>+</SUP> and ABCG2<SUP>=96</SUP><SUP> </SUP>cancer cells show =
very=20
similar tumorigenicities <I>in vivo</I>.<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 =
height=3D21=20
      alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/rarrow.gif" =
width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
      Materials and 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://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#top=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Top<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#ABS=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Abstract<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#SEC=
1"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Introduction<BR></A><IMG height=3D9 alt=3D" " =
hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/dot.gif" =
width=3D11=20
      border=3D0><FONT color=3D#464c53>Materials and =
Methods</FONT><BR><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#SEC=
3"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Results<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#SEC=
4"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Discussion<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#BIB=
L"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/darrow.gif" =
width=3D11=20
      =
border=3D0>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR><=
B>Cells,=20
reagents, and animals.</B> Various cancer cell lines including<SUP> =
</SUP>those=20
of prostate (PPC-1, Du145, LNCaP, and PC3 cells), breast<SUP> =
</SUP>(T47D,=20
MCF-7, MDA-MB231, MDA-MB435, and MDA-MB468), colon (COLO<SUP> </SUP>320, =
DLD-1,=20
RKO, and HCT116), bladder (RT4, UC14, UC1, and UC3),<SUP> </SUP>glioma =
(D54,=20
U87, U251, and U373), melanoma (WM266-4 and WM562-4),<SUP> </SUP>cervix =
(HeLa),=20
and ovary (SKOV-3) were obtained from American<SUP> </SUP>Type Culture=20
Collection (Manassas, MA) or collaborators and<SUP> </SUP>cultured in =
the=20
recommended medium containing 5% to 10% of heat-inactivated<SUP> =
</SUP>fetal=20
bovine serum (FBS). Xenograft human prostate tumors LAPC-4<SUP> =
</SUP>and LAPC-9=20
were kindly provided by C. Sawyers (Department of<SUP> </SUP>Medicine,=20
University of California, Los Angeles, CA) (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B49=
">49</A>)=20
and<SUP> </SUP>maintained in nonobese diabetic/severe combined=20
immunodeficiency<SUP> </SUP>(NOD/SCID) mice. Du145 xenograft tumors were =

established in<SUP> </SUP>our lab using early-passage cells and =
maintained in=20
NOD/SCID<SUP> </SUP>mice. All animals were obtained from The Jackson=20
Laboratory<SUP> </SUP>(Bar Harbor, ME) and maintained in standard =
conditions=20
according<SUP> </SUP>to the Institutional guidelines. The monoclonal=20
anti-ABCG2,<SUP> </SUP>FITC-, and PE-conjugated anti-ABCG2 monoclonal=20
antibodies, isotype<SUP> </SUP>control antibody, and secondary =
antibodies were=20
all obtained<SUP> </SUP>from Chemicon (Temecula, CA). Monoclonal =
antibodies=20
against<SUP> </SUP>Ber-EP4 and CD31 were obtained from DakoCytomation, =
Inc.=20
(Carpinteria,<SUP> </SUP>CA) and BD PharMingen (San Diego, CA), =
respectively.=20
All chemicals<SUP> </SUP>were obtained from Sigma (St. Louis, MO) unless =

specified otherwise.<SUP> </SUP>
<P><B>Side population analysis.</B> The protocol was based on =
Goodell<SUP>=20
</SUP>et al. (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B6"=
>6</A>)=20
with slight modifications. Briefly, cells (1 <FONT =
face=3Darial,helvetica>x</FONT>=20
10<SUP>6</SUP><SUP> </SUP>cells/mL) were incubated in prewarmed DMEM/5% =
FBS=20
containing<SUP> </SUP>freshly added Hoechst 33342 (5 =B5g/mL final=20
concentration)<SUP> </SUP>for 90 minutes at 37=B0C with intermittent =
mixing. In=20
some<SUP> </SUP>experiments, cells were incubated with the Hoechst dye =
in=20
the<SUP> </SUP>presence of verapamil (50 =B5mol/L) or reserpine (100 =
=B5mol/L).<SUP>=20
</SUP>At the end of incubation, cells were spun down in the cold =
and<SUP>=20
</SUP>resuspended in ice-cold PBS. 7-AAD (2 =B5g/mL final =
concentration)<SUP>=20
</SUP>was added for 5 minutes before fluorescence-activated cell =
sorting<SUP>=20
</SUP>(FACS) analysis, which allows for the discrimination of dead<SUP>=20
</SUP>versus live cells. As positive controls, we used HL60 =
promyelocytic<SUP>=20
</SUP>leukemia cells selected by chronic exposure to doxorubicin.<SUP>=20
</SUP>Samples were analyzed on a Coulter Epics flow cytometer. The<SUP>=20
</SUP>Hoechst dye was excited with the UV laser at 351 to 364 nm =
and<SUP>=20
</SUP>its fluorescence measured with a 515-nm side population =
filter<SUP>=20
</SUP>(Hoechst blue) and a 608 EFLP optical filter (Hoechst red).<SUP> =
</SUP>A=20
540 DSP filter was used to separate the emission wavelengths.<SUP> =
</SUP>
<P><B>Indirect immunofluorescence, flow cytometry analysis of ABCG2<SUP> =

</SUP>expression, and fluorescence-activated cell sorting of=20
ABCG2<SUP>+</SUP><SUP> </SUP>cells.</B> For fluorescence microscopy (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B50=
">50</A>),=20
3 to 10 <FONT face=3Darial,helvetica>x</FONT> 10<SUP>3</SUP> cells<SUP> =
</SUP>were=20
plated on glass coverslips. Next day, cells were fixed<SUP> </SUP>in 4%=20
paraformaldehyde (10 minutes at room temperature) and<SUP> </SUP>blocked =
in 10%=20
goat whole serum. Coverslips were incubated sequentially<SUP> </SUP>with =

monoclonal antibody anti-ABCG2, biotinylated goat anti-mouse<SUP> =
</SUP>IgG, and=20
FITC-conjugated streptavidin with washings in between.<SUP> =
</SUP>Generally=20
1,200 to 1,500 cells were counted for each cell type<SUP> </SUP>to =
quantify the=20
ABCG2<SUP>+</SUP> cells. For flow cytometry, cells were<SUP> =
</SUP>gently=20
dissociated with Accutase (Innovative Cell Technologies,<SUP> =
</SUP>Inc., San=20
Diego, CA) and washed (twice) in serum-free medium.<SUP> </SUP>Cells =
were=20
stained live in the staining solution containing<SUP> </SUP>bovine serum =
albumin=20
and insulin and FITC- or PE-conjugated<SUP> </SUP>monoclonal anti-ABCG2 =
(15=20
minutes at 4=B0C). Samples were<SUP> </SUP>analyzed on a Coulter flow =
cytometer. A=20
minimum of 500,000 viable<SUP> </SUP>cells was measured per sample, and =
cell=20
debris and cell aggregates<SUP> </SUP>were electronically gated out. For =
FACS, 2=20
to 4 <FONT face=3Darial,helvetica>x</FONT> 10<SUP>7</SUP> cells<SUP> =
</SUP>were=20
similarly stained for ABCG2 and used to sort out ABCG2<SUP>+</SUP><SUP>=20
</SUP>and ABCG2<SUP>=96</SUP> cells. For the positive population, only =
the<SUP>=20
</SUP>top 10% most brightly stained cells were selected. For the =
negative<SUP>=20
</SUP>population, only the bottom 5% to 10% most dimly stained =
cells<SUP>=20
</SUP>were selected. The purity of ABCG2<SUP>+</SUP> cells, as =
determined=20
by<SUP> </SUP>both post-sorting flow analyses as well as restaining=20
followed<SUP> </SUP>by fluorescence microscopy analyses, was <IMG =
alt=3D&#8805;=20
src=3D"http://cancerres.aacrjournals.org/math/ge.gif" border=3D0>98% and =
the=20
purity<SUP> </SUP>of the ABCG2<SUP>=96</SUP> cells was <IMG =
alt=3D&#8805;=20
src=3D"http://cancerres.aacrjournals.org/math/ge.gif" =
border=3D0>99%.<SUP> </SUP>
<P><B>Xenograft tumor experiments and <I>in vivo</I> tumorigenicity.</B> =

Xenograft<SUP> </SUP>prostate (Du145, LAPC-4, and LAPC-9) and glioma =
(U373)=20
tumors<SUP> </SUP>were aseptically dissected out from animals and minced =

into<SUP> </SUP><IMG alt=3D~ =
src=3D"http://cancerres.aacrjournals.org/math/sim.gif"=20
border=3D0>1 mm<SUP>3</SUP> pieces in DMEM supplemented with 10% FBS. =
After=20
rinsing<SUP> </SUP>in the same medium (twice) followed by PBS to wash =
out=20
serum,<SUP> </SUP>tumor tissues were incubated with 1<FONT=20
face=3Darial,helvetica>x</FONT> Accumax (1,200-2,000 units/mL<SUP>=20
</SUP>proteolytic activity containing collagenase and DNase; =
Innovative<SUP>=20
</SUP>Cell Technologies) at 10 mL/1 g tissue in DPBS for 20 minutes<SUP> =

</SUP>at 37=B0C under rotating conditions. At the end, residual<SUP> =
</SUP>tissues=20
were allowed to precipitate to the bottom of tubes and<SUP> =
</SUP>dissociated=20
cells collected from the supernatant. When necessary,<SUP> </SUP>the =
residual=20
tumor pieces were subjected to one or more rounds<SUP> </SUP>of Accumax=20
digestion and dissociated cells pooled. A single<SUP> </SUP>cell =
suspension was=20
obtained by filtering the supernatant through<SUP> </SUP>a 40-=B5m cell =
strainer=20
(BD Falcon, Bedford, MA). Upon viability<SUP> </SUP>count using =
erythrosin B=20
(American Type Culture Collection),<SUP> </SUP>cell suspension was =
gently loaded=20
onto a layer of Histopaque-1077<SUP> </SUP>gradient (Sigma-Aldrich, St. =
Louis,=20
MO) and centrifuged at 400<SUP> </SUP><FONT =
face=3Darial,helvetica>x</FONT>=20
<I>g</I> for 30 minutes at room temperature. RBC, dead cells, and<SUP>=20
</SUP>debris were removed from the bottom of the tube and live =
nucleated<SUP>=20
</SUP>cells collected at the interface. Then the cell mixture was<SUP>=20
</SUP>depleted of lineage-positive host cells using the <I>MACS</I> =
Lineage<SUP>=20
</SUP>Cell Depletion Kit (Miltenyi Biotec, Auburn, CA). Briefly, =
cells<SUP>=20
</SUP>were first incubated (10 minutes at 4=B0C) in the staining<SUP>=20
</SUP>solution [PBS (pH 7.2), 0.5% FBS, 0.5 =B5g/mL insulin] =
containing<SUP>=20
</SUP>biotinylated antibodies against a panel of lineage antigens<SUP>=20
</SUP>(CD5, CD45R, CD11b, anti-Ly-6G, 7-4, and Ter-119). Cells were<SUP> =

</SUP>then incubated with the anti-biotin Microbeads (15 minutes at<SUP> =

</SUP>4=B0C) and the Lin<SUP>=96</SUP> cells were eluted using the MS =
columns.<SUP>=20
</SUP>The eluted prostate cancer cells were all human epithelial =
cells<SUP>=20
</SUP>as confirmed by their expression of Ber-EP4, a surface marker<SUP> =

</SUP>unique to human epithelial cells, indicating that we had =
obtained<SUP>=20
</SUP>highly purified human tumor cells using this protocol.<SUP> </SUP>
<P>For tumor experiments, various numbers of cells, either unsorted<SUP> =

</SUP>or sorted populations (i.e., side population, non=96side<SUP>=20
</SUP>population, ABCG2<SUP>+</SUP>, and ABCG2<SUP>=96</SUP>) were =
injected in 40=20
=B5L<SUP> </SUP>of medium/Matrigel (1:1) s.c. into either male or female =

NOD/SCID<SUP> </SUP>mice (4-8 weeks old). MCF7 cells were injected into =
female=20
mice.<SUP> </SUP>Tumor development was monitored starting from the =
second=20
week.<SUP> </SUP>The primary tumor sizes were measured with a caliper on =
a=20
weekly<SUP> </SUP>basis and approximate tumor weights determined using =
the=20
formula<SUP> </SUP>0.5<I>ab</I><SUP>2</SUP>, where <I>b</I> is the =
smaller of=20
the two perpendicular diameters.<SUP> </SUP>Tumorigenicity was measured =
mainly=20
by tumor incidence (i.e.,<SUP> </SUP>the number of tumors/number of =
injections)=20
and latency (i.e.,<SUP> </SUP>time from injection to detection of =
palpable=20
tumors). All animals<SUP> </SUP>were terminated at 6 to 9 months after =
tumor=20
cell injection.<SUP> </SUP>Tumors harvested were fixed in formalin and =
paraffin=20
sections<SUP> </SUP>were made for H&amp;E staining or =
immunohistochemistry for=20
CD31.<SUP> </SUP>
<P><B>Relationship between ABCG2 expression and cell =
proliferation.</B><SUP>=20
</SUP>Two sets of experiments were done. In one, cells undergoing<SUP>=20
</SUP>mitotic division were determined in ABCG2<SUP>+</SUP> and=20
ABCG2<SUP>=96</SUP><SUP> </SUP>populations of cells. In the other, =
purified=20
ABCG2<SUP>+</SUP> and ABCG2<SUP>=96</SUP><SUP> </SUP>cancer cells, =
cultured for=20
various time intervals, were pulsed<SUP> </SUP>with BrdU (2.5 =B5mol/L =
<FONT=20
face=3Darial,helvetica>x</FONT> 3 hours) and processed for BrdUrd<SUP>=20
</SUP>staining (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B50=
">50</A>).<SUP>=20
</SUP>
<P><B><I>In vitro</I> and <I>in vivo</I> self-renewal and clonal =
analyses.</B>=20
Purified<SUP> </SUP>ABCG2<SUP>+</SUP> and ABCG2<SUP>=96</SUP> cancer =
cells were=20
plated at clonal density<SUP> </SUP>(i.e., 100-400 cells per well; =
depending on=20
cell type) in the<SUP> </SUP>flat-bottomed 6-well culture dishes. Cells =
were=20
cultured for<SUP> </SUP>different time periods. The percentage of cells =
that=20
initiated<SUP> </SUP>a clone was presented as cloning efficiency. The =
clone=20
sizes<SUP> </SUP>(i.e., the number of cells/clone) were determined for =
some=20
time<SUP> </SUP>points. Triplicate samples were run for each cell type =
and=20
experiments<SUP> </SUP>repeated when feasible. For <I>in vivo</I> =
self-renewal=20
experiments,<SUP> </SUP>tumor cells purified from the tumors derived =
from=20
unsorted,<SUP> </SUP>ABCG2<SUP>+</SUP>, or ABCG2<SUP>=96</SUP> cells =
were stained=20
for ABCG2 and used<SUP> </SUP>to quantify the ABCG2-expressing cells by =
flow=20
cytometry.<SUP> </SUP>
<P><B>Preparation of mouse bone marrow and newborn mouse =
keratinocytes.</B><SUP>=20
</SUP>To prepare bone marrow, we sacrificed C57BL/6 mice (6-8 weeks<SUP> =

</SUP>old) by cervical dislocation and removed the skin covering =
the<SUP>=20
</SUP>femurs. The bones were removed by cutting below the knee and<SUP>=20
</SUP>cutting at the hip. The muscle was then cleaned from both =
femurs.<SUP>=20
</SUP>The bone marrow cells were flushed out of the femur using a<SUP>=20
</SUP>27-gauge needle in 50 mL of PBS, washed once, and used in the<SUP> =

</SUP>side population analysis. For keratinocytes, newborn pups =
were<SUP>=20
</SUP>cleaned and anesthetized on ice for at least 30 minutes. The<SUP>=20
</SUP>tail and limbs were removed and discarded. The skin was =
removed<SUP>=20
</SUP>and floated on 2 mL trypsin (0.25%) solution with dermal side<SUP> =

</SUP>down overnight at 4=B0C. Epidermis was removed from dermis,<SUP>=20
</SUP>placed in Waymouth's Medium (Life Technologies, Gaithersburg,<SUP> =

</SUP>MD) containing 10% FBS and 1% penicillin-streptomycin and =
minced.<SUP>=20
</SUP>The minced epidermis was gently stirred for 20 minutes in a<SUP>=20
</SUP>sterile glass beaker. The resulting solution was filtered =
through<SUP>=20
</SUP>a 30-=B5m mesh and plated at 3 <FONT =
face=3Darial,helvetica>x</FONT>=20
10<SUP>6</SUP> cells per 35-mm dish<SUP> </SUP>for 2.5 hours. The medium =
was=20
changed to Keratinocyte Growth<SUP> </SUP>Medium - 2 (KGM-2; Cambrex =
BioScience=20
Walkersville, Inc., Walkersville,<SUP> </SUP>MD) with 0.5 mmol/L =
calcium. Cells=20
were either used freshly<SUP> </SUP>or cultured for a short period of =
time (to=20
expand) and used<SUP> </SUP>in the side population analysis.<SUP> </SUP>
<P><B>Reverse transcription-PCR analysis.</B> Total RNA was isolated =
using<SUP>=20
</SUP>the Absolutely RNA Nanoprep Kit (Stratagene, La Jolla, CA) =
and<SUP>=20
</SUP>used in semiquantitative reverse transcription-PCR (RT-PCR)<SUP>=20
</SUP>analysis (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B50=
">50</A>).=20
The PCR primers included ABCG2 (sense, 5'-CTGAGATCCTGAGCCTTTGG-3';<SUP>=20
</SUP>antisense, 5'-TGCCCATCACAACATCATCT-3'); Notch-1 (sense,=20
5'-ATCGGGCACCTGAACGTGGCG-3;<SUP> </SUP>antisense, 5'-CACGTCTGCCTGGCTCGG =
CTC-3');=20
=DF-catenin<SUP> </SUP>(sense, 5'-ACTGGCAGCAACAGTCTTACC-3'; antisense,=20
5'-TTTGAAGGCAGTCTGTC<SUP> </SUP>GTAAT-3'); SMO (sense,=20
5'-ATCTCCACAGGAGAGACTGGTTCGG-3'; antisense,<SUP> </SUP>5'-AAAGTGGG=20
GCCTTGGGAACATG-3'); Oct-4 (sense, 5'-GTGGAGGAAGCTGCAAACAATGAAA-3';<SUP>=20
</SUP>antisense, 5'-GACCGAGGAGTTACAGTGCAGTGAAG-3'); and=20
glyceraldehyde-3-phosphate<SUP> </SUP>dehydrogenase (sense, =
5'-ACCACAGTCCATGC=20
CATCAC-3'; antisense,<SUP> </SUP>5'-TCCACCACCCTGTTGCTGTA-3').<SUP> =
</SUP>
<P><A 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 =
height=3D21=20
      alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.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://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#top=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Top<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#ABS=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Abstract<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#SEC=
1"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Introduction<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#SEC=
2"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Materials and Methods<BR></A><IMG height=3D9 alt=3D" " =
hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/dot.gif" =
width=3D11=20
      border=3D0><FONT color=3D#464c53>Results</FONT><BR><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#SEC=
4"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Discussion<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#BIB=
L"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/darrow.gif" =
width=3D11=20
      =
border=3D0>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR><=
B>Some=20
cultured human cancer cells and xenograft tumors have a<SUP> </SUP>side=20
population.</B> Several articles have recently reported the<SUP> =
</SUP>presence=20
of stem cell=96enriched side population in long-term<SUP> </SUP>cultured =
mouse=20
C2C12 myogenic cells (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B39=
">39</A>),=20
rat C6 glioma cells<SUP> </SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B48=
">48</A>),=20
or human brain tumor (i.e., glioma and medulloblastoma;<SUP> </SUP>ref. =
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B37=
">37</A>)=20
cells. We first sought to determine whether this phenomenon<SUP> =
</SUP>is=20
generally applicable to other human tumor cells in culture,<SUP> =
</SUP>in=20
particular, the human epithelial cancer cells. To that end,<SUP> =
</SUP>we first=20
established the side population protocol on our flow<SUP> =
</SUP>cytometer using=20
as experimental controls the HL60-Dox cells<SUP> </SUP>(courtesy of Dr. =
M.=20
Andreef, Department of Blood and Marrow<SUP> </SUP>Transplantation, UT =
MD=20
Anderson Cancer Center, Houston, TX);<SUP> </SUP>i.e., HL60 leukemia =
cells=20
chronically exposed to a low concentration<SUP> </SUP>of doxorubicin. =
The=20
HL60-Dox cells overexpressed the multidrug<SUP> </SUP>resistance =
proteins that=20
allowed them to efflux various drugs<SUP> </SUP>and xenobiotics =
including the=20
Hoechst 33342 dye.<A name=3DRFN2></A><SUP><A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FN2=
">4</A></SUP>=20
As shown in<SUP> </SUP><A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
1">Fig.=20
1</A>, unselected HL60 cells did not show a side population<SUP>=20
</SUP>(<I>A</I>) whereas &gt;90% of the HL60-Dox cells were in the side=20
population<SUP> </SUP>(<I>B</I>), which presented as a distinct "tail" =
on the=20
histogram and<SUP> </SUP>was completely inhibited by either verapamil =
(<I>C</I>)=20
or reserpine<SUP> </SUP>(<I>D</I>), chemicals previously shown to block =
the side=20
population<SUP> </SUP>phenotype (e.g., refs. <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B6"=
>6</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B33=
">33</A>).=20
To determine the sensitivity<SUP> </SUP>of our system, we titrated the =
HL60-Dox=20
cells into HL60 cultures<SUP> </SUP>and then did side population =
analysis. The=20
results (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
1">Fig.=20
1<I>E-H</I></A>)<SUP> </SUP>revealed that our system could reliably =
detect a=20
side population<SUP> </SUP>of <IMG alt=3D~=20
src=3D"http://cancerres.aacrjournals.org/math/sim.gif" border=3D0>0.01%. =
Indeed,=20
using these experimental conditions, we reliably<SUP> </SUP>detected =
<IMG alt=3D~=20
src=3D"http://cancerres.aacrjournals.org/math/sim.gif" border=3D0>0.01% =
and 0.5%=20
side population in mouse bone marrow<SUP> </SUP>cells (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
1">Fig.=20
1<I>I</I></A>) and newborn mouse keratinocytes (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
1">Fig.=20
1<I>L</I></A>), respectively,<SUP> </SUP>and the side population =
phenotypes in=20
these cells could also<SUP> </SUP>be blocked by verapamil or reserpine =
(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
1">Fig.=20
1<I>J</I> and <I>K</I></A>; data not<SUP> </SUP>shown).<SUP> </SUP>
<P><A name=3DFIG1><!-- 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://cancerres.aacrjournals.org/cgi/content/full/65/14/6207/FIG=
1"><IMG=20
            height=3D200 alt=3D" " hspace=3D10=20
            =
src=3D"http://cancerres.aacrjournals.org/content/vol65/issue14/images/sma=
ll/05-0592f01c.gif"=20
            width=3D151 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (58K):<BR><NOBR><A=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207/FIG=
1">[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('FIG1', 482, 640); =
this.href=3D'/cgi/content-nw/full/65/14/6207/FIG1'"=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content-nw/full/65/14/6207/=
FIG1"=20
            target=3DFIG1>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><B>Figure 1.</B> Side population =

            (<I>SP</I>) analysis. <I>A-H,</I> determination of the =
sensitivity=20
            of the side population protocol using HL60-Dox cells. =
<I>Vera,</I>=20
            verapamil; <I>Res,</I> reserpine. <I>E-H,</I> HL60-Dox cells =
were=20
            added to HL60 cells at the concentrations indicated. =
<I>I-K,</I>=20
            mouse bone marrow (<I>BM</I>) cells were used in side =
population=20
            analysis in the absence (<I>I</I>) or presence of verapamil=20
            (<I>J</I>) or reserpine (<I>K</I>). <I>L,</I> newborn mouse=20
            keratinocytes were used in side population analysis.
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR>Using=20
the above protocol, we surveyed <IMG alt=3D~=20
src=3D"http://cancerres.aacrjournals.org/math/sim.gif" border=3D0>30 =
cultured human=20
tumor<SUP> </SUP>cell lines of the prostate, breast, colon, glioma,=20
bladder,<SUP> </SUP>ovary, cervix, glioma, and melanoma and we reliably=20
detected<SUP> </SUP>a side population (0.04-0.2%) in <IMG alt=3D~=20
src=3D"http://cancerres.aacrjournals.org/math/sim.gif" border=3D0>30% of =
the cell=20
lines (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#TBL=
1">Table=20
1</A>;<SUP> </SUP>data not shown). We also analyzed side population in=20
tumor<SUP> </SUP>cells freshly purified from three xenograft human =
prostate=20
tumors<SUP> </SUP>(i.e., Du145, LAPC-4, and LAPC-9), and we only =
detected a=20
distinct<SUP> </SUP>side population (0.07%) in the LAPC-9 tumor (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#TBL=
1">Table=20
1</A>; data not<SUP> </SUP>shown). These results suggest that only some =
cultured=20
human<SUP> </SUP>cancer cells and tumors cells freshly purified from=20
xenograft<SUP> </SUP>tumors contain a detectable side population and =
that most=20
cultured<SUP> </SUP>human cancer cells may have a side population too =
small=20
(i.e.,<SUP> </SUP>&lt;0.01%) to be reliably detected.<SUP> </SUP>
<P><A name=3DTBL1><!-- 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://cancerres.aacrjournals.org/cgi/content/full/65/14/6207/TBL=
1">[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('TBL1', 500, 400); =
this.href=3D'/cgi/content-nw/full/65/14/6207/TBL1'"=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content-nw/full/65/14/6207/=
TBL1"=20
            target=3DTBL1>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><B>Table 1.</B> Side population =
and ABCG2=20
            in human tumor cells
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR><B>Side=20
population cells are more tumorigenic than the non=96side<SUP> =
</SUP>population=20
cells.</B> The side population cells isolated from the<SUP> </SUP>rat C6 =
glioma=20
have been shown to be more tumorigenic than the<SUP> </SUP>non=96side =
population=20
cells (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B48=
">48</A>).=20
To determine whether the<SUP> </SUP>side population cells we identified =
in human=20
cancer cells might<SUP> </SUP>also be more tumorigenic, we did several=20
small-scale tumor experiments.<SUP> </SUP>We first purified the side =
population=20
cells from the U373 glioma<SUP> </SUP>cells, which had <IMG alt=3D~=20
src=3D"http://cancerres.aacrjournals.org/math/sim.gif" border=3D0>0.1% =
side=20
population (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#TBL=
1">Table=20
1</A>; <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
2">Fig.=20
2<I>A</I>, <I>a-b</I></A>).<SUP> </SUP>When 1,000 U373 side population =
cells=20
were injected into the<SUP> </SUP>NOD/SCID mice, a prominent tumor arose =
within=20
about 1 month<SUP> </SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#TBL=
2">Table=20
2</A>; <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
2">Fig.=20
2<I>A, c</I></A>). The side population tumor histologically<SUP> =
</SUP>resembled=20
clinical samples in that it had palisades-like structures<SUP> </SUP>(<A =

href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
2">Fig.=20
2<I>A, d</I></A>) and was highly vascularized (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
2">Fig.=20
2<I>A, e</I></A>). In contrast,<SUP> </SUP>no tumor was observed in 7 =
months=20
when 50,000 non=96side<SUP> </SUP>population U373 cells were injected =
(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#TBL=
2">Table=20
2</A>).<SUP> </SUP>
<P><A name=3DFIG2><!-- 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://cancerres.aacrjournals.org/cgi/content/full/65/14/6207/FIG=
2"><IMG=20
            height=3D137 alt=3D" " hspace=3D10=20
            =
src=3D"http://cancerres.aacrjournals.org/content/vol65/issue14/images/sma=
ll/05-0592f02c.gif"=20
            width=3D200 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (47K):<BR><NOBR><A=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207/FIG=
2">[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('FIG2', 590, 501); =
this.href=3D'/cgi/content-nw/full/65/14/6207/FIG2'"=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content-nw/full/65/14/6207/=
FIG2"=20
            target=3DFIG2>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><B>Figure 2.</B> Side population =

            (<I>SP</I>) cells are more tumorigenic and have some stem =
cell=20
            properties. <I>A,</I> U373 side population analysis =
(<I>a-b</I>) and=20
            the side population cell-initiated tumor (<I>c</I>) analyzed =
for=20
            histology (<I>d</I>; <FONT =
face=3Darial,helvetica>x</FONT>100) or CD31=20
            staining (<I>e</I>; <FONT =
face=3Darial,helvetica>x</FONT>100).=20
            Clonogenic assays using side population and non=96side =
population=20
            cells (<I>f</I>). <I>B,</I> MCF7 side population analysis =
(<I>a</I>)=20
            or RT-PCR assays (<I>b</I>). <I>C,</I> LAPC-9 side =
population=20
            analysis (<I>a-b</I>) and RT-PCR assays (<I>c</I>).
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR><A=20
name=3DTBL2><!-- 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://cancerres.aacrjournals.org/cgi/content/full/65/14/6207/TBL=
2">[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('TBL2', 500, 400); =
this.href=3D'/cgi/content-nw/full/65/14/6207/TBL2'"=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content-nw/full/65/14/6207/=
TBL2"=20
            target=3DTBL2>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><B>Table 2.</B> Side population =
is=20
            enriched with tumorigenic cells
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR>We=20
similarly isolated side population cells from MCF7 breast<SUP> =
</SUP>cancer=20
cells, which had <IMG alt=3D~ =
src=3D"http://cancerres.aacrjournals.org/math/sim.gif"=20
border=3D0>0.2% side population (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#TBL=
1">Table=20
1</A>; <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
2">Fig.<SUP>=20
</SUP>2<I>B, a</I></A>). When injected into the NOD/SCID mice, we =
observed=20
a<SUP> </SUP>cell number=96dependent tumor development (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#TBL=
2">Table=20
2</A>). For<SUP> </SUP>example, we observed a 17% (one of six) tumor =
incidence=20
with<SUP> </SUP>1,000 side population cells injected and 50% (three of =
six)<SUP>=20
</SUP>tumor incidence with 10,000 side population cells injected (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#TBL=
2">Table=20
2</A>).<SUP> </SUP>Tumor latency was also reduced with increased numbers =
of<SUP>=20
</SUP>side population cells injected (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#TBL=
2">Table=20
2</A>). In contrast to the<SUP> </SUP>side population MCF7 cells, the =
non=96side=20
population MCF7<SUP> </SUP>at 1,000 cells did not give rise to any =
tumors (zero=20
of six).<SUP> </SUP>With 10,000 cells injected, we observed one tumor =
with six=20
injections<SUP> </SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#TBL=
2">Table=20
2</A>). Even with 250,000 cells injected, we only observed<SUP> =
</SUP>one of two=20
tumor incidence (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#TBL=
2">Table=20
2</A>). In addition, the tumors<SUP> </SUP>from the non=96side =
population MCF7=20
cells arose with longer<SUP> </SUP>latencies (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#TBL=
2">Table=20
2</A>).<SUP> </SUP>
<P>Finally, we purified from the LAPC-9 prostate xenograft tumors<SUP> =
</SUP>the=20
side population cells, which constituted <IMG alt=3D~=20
src=3D"http://cancerres.aacrjournals.org/math/sim.gif" border=3D0>0.07% =
of the=20
total<SUP> </SUP>tumor (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#TBL=
1">Table=20
1</A>; <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
2">Fig.=20
2<I>C, a-b</I></A>). When injected into the NOD/SCID<SUP> </SUP>mice, as =
few as=20
100 cells generated a tumor (25% incidence;<SUP> </SUP><A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#TBL=
2">Table=20
2</A>). With 1,000 side population cells injected, we observed<SUP> =
</SUP>a=20
tumor incidence of 75% (three of four; <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#TBL=
2">Table=20
2</A>). With 1,500<SUP> </SUP>side population cells injected, we =
observed two of=20
two tumor<SUP> </SUP>formation with shorter latencies (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#TBL=
2">Table=20
2</A>). Tumors derived from<SUP> </SUP>the side population cells =
histologically=20
resembled the unsorted<SUP> </SUP>LAPC-9 tumors (data not shown). In =
contrast,=20
no tumor generation<SUP> </SUP>was observed with 1,500 (zero of six) or =
15,000=20
(zero of four)<SUP> </SUP>non=96side population LAPC-9 cells injected. =
Even=20
150,000<SUP> </SUP>non=96side population LAPC-9 cells injected did not =
give<SUP>=20
</SUP>rise to tumors within 9 months, although tumor did arise with<SUP> =

</SUP>300,000 non=96side population cells (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#TBL=
2">Table=20
2</A>). These results<SUP> </SUP>suggest that the side population LAPC-9 =
tumor=20
cells are probably<SUP> </SUP>&gt;100 times more tumorigenic than the =
non=96side=20
population<SUP> </SUP>LAPC-9 cells.<SUP> </SUP>
<P><B>Side population cells have some stem cell properties.</B> To=20
determine<SUP> </SUP>whether the higher tumorigenicity in the side =
population=20
cells<SUP> </SUP>might be associated with some of the intrinsic stem =
cell=20
properties,<SUP> </SUP>we first used the purified side population and=20
non=96side<SUP> </SUP>population U373 cells in a clonogenic assay, which =

partially<SUP> </SUP>measures the self-renewal capacity of the cells. As =
shown=20
in<SUP> </SUP><A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
2">Fig.=20
2<I>A, f</I></A>, whereas <IMG alt=3D~=20
src=3D"http://cancerres.aacrjournals.org/math/sim.gif" border=3D0>10% of =
the side=20
population U373 cells could<SUP> </SUP>sustain a clonal growth, =
&lt;0.01% of the=20
non=96side population<SUP> </SUP>U373 cells were clonogenic. Then we =
asked whether=20
the side population<SUP> </SUP>cell-generated tumors contain non=96side =
population=20
cells<SUP> </SUP>and can be further passaged <I>in vivo</I>. To that =
end, we=20
took the<SUP> </SUP>U373 side population tumor obtained from the =
preceding=20
experiments<SUP> </SUP>(above) and purified tumor cells out and did side =

population<SUP> </SUP>analysis. The results revealed a side population =
of <IMG=20
alt=3D~ src=3D"http://cancerres.aacrjournals.org/math/sim.gif" =
border=3D0>0.1%=20
(data<SUP> </SUP>not shown), which was similar to the percentage of side =

population<SUP> </SUP>cells in the first-generation tumor (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#TBL=
1">Table=20
1</A>; <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
2">Fig.=20
2<I>A, a</I></A>). These<SUP> </SUP>observations suggest that the side=20
population cells can give<SUP> </SUP>rise to non=96side population cells =
<I>in=20
vivo</I>. When injected<SUP> </SUP>into the NOD/SCID mice, 100 side =
population=20
cells generated<SUP> </SUP>tumors with <IMG alt=3D~=20
src=3D"http://cancerres.aacrjournals.org/math/sim.gif" border=3D0>60% (7 =
of 11)=20
efficiency and 1,000 side population<SUP> </SUP>U373 cells also =
generated a=20
tumor (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#TBL=
2">Table=20
2</A>). By contrast, no<SUP> </SUP>tumors were observed with 1,000 =
non=96side=20
population cells<SUP> </SUP>injected (zero of six). Even 200,000 =
non=96side=20
population<SUP> </SUP>U373 cells injected did not generate a tumor (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#TBL=
2">Table=20
2</A>), suggesting<SUP> </SUP>that the U373 side population cells =
possess=20
self-renewal capacities<SUP> </SUP><I>in vitro</I> and <I>in vivo</I> =
and they=20
are probably &gt;200 more tumorigenic<SUP> </SUP>than the non=96side =
population=20
cells.<SUP> </SUP>
<P>To determine whether the side population cells have some other<SUP>=20
</SUP>intrinsic properties of stem cells such as preferential =
expression<SUP>=20
</SUP>of "stemness" genes, which are important for stem cell =
self-renewal,<SUP>=20
</SUP>proliferative capacity, or fate determination (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B2"=
>2</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B47=
">47</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B51=
">51</A>),<A=20
name=3DRFN1></A><SUP><A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FN1=
">3</A></SUP><SUP>=20
</SUP>we did semiquantitative RT-PCR analysis of Notch-1, =
=DF-catenin<SUP>=20
</SUP>(a crucial molecule in the Wnt signaling pathway), and =
Smoothened<SUP>=20
</SUP>(SMO; the activating receptor for the Hedgehog signaling =
pathway).<SUP>=20
</SUP>As shown in <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
2">Fig.=20
2<I>B, b</I></A>, the side population MCF7 cells expressed<SUP> =
</SUP>higher=20
levels of Notch-1 and =DF-catenin mRNAs than<SUP> </SUP>the non=96side =
population=20
MCF7 cells although both populations<SUP> </SUP>expressed similar levels =
of SMO=20
mRNA.<SUP> </SUP>
<P>Taken together, these results suggest that the side population<SUP>=20
</SUP>cancer cells have some intrinsic properties of stem cells, =
similar<SUP>=20
</SUP>to observations in various normal stem cell populations (see<SUP>=20
</SUP>Introduction).<SUP> </SUP>
<P><B>Expression of ABCG2 in a small subset of cancer cells: =
association<SUP>=20
</SUP>of ABCG2 with cell proliferation.</B> Three considerations =
made<SUP>=20
</SUP>us to turn our attention to ABCG2. First, ABCG2 is one of the<SUP> =

</SUP>primary mediators of the side population phenotype in mouse<SUP>=20
</SUP>bone marrow and some other cells (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B35=
">35</A>).=20
Second, the majority<SUP> </SUP>of the cancer cells we have studied do =
not=20
possess a detectable<SUP> </SUP>side population under our experimental=20
conditions therefore<SUP> </SUP>an alternate "marker" is needed to =
identify the=20
rare tumorigenic<SUP> </SUP>cells. Third, one of the potential concerns =
in the=20
side population<SUP> </SUP>analysis is that the chronic accumulation of =
the low=20
levels<SUP> </SUP>of the Hoechst dye in the non=96side population cells =
might<SUP>=20
</SUP>be toxic to these cells, although our post-sort viability =
analysis<SUP>=20
</SUP>as well as culture of multiple non=96side population cells<SUP> =
</SUP>did=20
not reveal such cytotoxicities (data not shown). Regardless,<SUP> =
</SUP>if ABCG2=20
could be used as a surrogate marker for the side population<SUP> =
</SUP>cells, it=20
would completely avoid the potential cytotoxicity<SUP> </SUP>problem. =
With these=20
considerations, we first examined the relationship<SUP> </SUP>between =
side=20
population cells and ABCG2 expression. As expected,<SUP> </SUP>the side=20
population MCF7 cells expressed higher levels of ABCG2<SUP> </SUP>mRNA =
than the=20
non=96side population cells (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
2">Fig.=20
2<I>B, b</I></A>).<SUP> </SUP>We then examined the ABCG2 protein =
expression,=20
using both immunofluorescence<SUP> </SUP>staining and flow cytometry, in =
the=20
same spectrum of human tumor<SUP> </SUP>cell lines and xenograft =
tumor-derived=20
cells. In every case,<SUP> </SUP>we detected ABCG2 expression in a small =

percentage (0.1-4%)<SUP> </SUP>of the cells (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#TBL=
1">Table=20
1</A>; <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
3">Fig.=20
3</A>). A similar ABCG2 expression pattern<SUP> </SUP>(i.e., 0.1-2%) was =
also=20
observed in several bladder cell lines<SUP> </SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
3">Fig.=20
3<I>E, d</I></A>; data not shown) as well as in LAPC-4 and LAPC-9<SUP>=20
</SUP>xenograft tumors (data not shown).<SUP> </SUP>
<P><A name=3DFIG3><!-- 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://cancerres.aacrjournals.org/cgi/content/full/65/14/6207/FIG=
3"><IMG=20
            height=3D160 alt=3D" " hspace=3D10=20
            =
src=3D"http://cancerres.aacrjournals.org/content/vol65/issue14/images/sma=
ll/05-0592f03c.gif"=20
            width=3D200 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (79K):<BR><NOBR><A=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207/FIG=
3">[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('FIG3', 590, 553); =
this.href=3D'/cgi/content-nw/full/65/14/6207/FIG3'"=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content-nw/full/65/14/6207/=
FIG3"=20
            target=3DFIG3>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><B>Figure 3.</B> ABCG2 =
expression in human=20
            cancer cells. Cultured glioma (<I>A</I>), or prostate =
(<I>B</I>),=20
            breast (<I>C</I>), colon (<I>D</I>), or other (<I>E</I>; see =
<A=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#TBL=
1">Table=20
            1</A>) cancer cells were stained for ABCG2 using a =
monoclonal=20
            antibody. Original magnifications, <FONT=20
            face=3Darial,helvetica>x</FONT>100.
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR>Interestingly,=20
we observed that many of the ABCG2<SUP>+</SUP> cancer cells<SUP> =
</SUP>were in=20
the process of cell division (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
4">Fig.=20
4</A>). Overall, we observed<SUP> </SUP>that <IMG alt=3D~=20
src=3D"http://cancerres.aacrjournals.org/math/sim.gif" border=3D0>30% of =
the=20
ABCG2<SUP>+</SUP> cancer cells were mitotic, whereas only<SUP> =
</SUP><IMG alt=3D~=20
src=3D"http://cancerres.aacrjournals.org/math/sim.gif" border=3D0>1% of =
the=20
ABCG2<SUP>=96</SUP> cells were mitotic. In clonal analyses,<SUP> =
</SUP>we found=20
that the majority of divided cells that had completed<SUP> </SUP>or were =
about=20
to complete cytokinesis equally distributed ABCG2<SUP> </SUP>to both =
daughter=20
cells (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
4">Fig.=20
4<I>G-I</I> and <I>J-L</I></A>). However, in <IMG alt=3D~=20
src=3D"http://cancerres.aacrjournals.org/math/sim.gif" border=3D0>1% =
of<SUP>=20
</SUP>the dividing cells undergoing cytokinesis ABCG2 seemed to =
segregate<SUP>=20
</SUP>asymmetrically to mainly one daughter cell (e.g., <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
4">Fig.=20
4<I>M-O</I></A>).<SUP> </SUP>These observations suggest that ABCG2 might =

preferentially mark<SUP> </SUP>proliferating cells and that some=20
ABCG2-expressing cancer cells<SUP> </SUP>might be undergoing =
asymmetrical cell=20
division, a cardinal feature<SUP> </SUP>of stem cells. To determine =
whether=20
ABCG2 expression might be<SUP> </SUP>associated with cell proliferation =
in=20
general, we prospectively<SUP> </SUP>purified ABCG2<SUP>+</SUP> and=20
ABCG2<SUP>=96</SUP> cancer cells to near homogeneity<SUP> </SUP>and used =
them in a=20
BrdU-labeling experiment. As shown in <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
5">Fig.=20
5</A>,<SUP> </SUP>acutely purified ABCG2<SUP>+</SUP> Du145 prostate =
(<I>A</I>)=20
and MDA-MB435<SUP> </SUP>breast (<I>B</I>) cancer cells that had been=20
BrdU-pulsed and cultured<SUP> </SUP>for only 3 hours showed =
significantly more=20
proliferation than<SUP> </SUP>the corresponding ABCG2<SUP>=96</SUP> =
cells.<SUP>=20
</SUP>
<P><A name=3DFIG4><!-- 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://cancerres.aacrjournals.org/cgi/content/full/65/14/6207/FIG=
4"><IMG=20
            height=3D200 alt=3D" " hspace=3D10=20
            =
src=3D"http://cancerres.aacrjournals.org/content/vol65/issue14/images/sma=
ll/05-0592f04c.gif"=20
            width=3D192 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (47K):<BR><NOBR><A=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207/FIG=
4">[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('FIG4', 573, 640); =
this.href=3D'/cgi/content-nw/full/65/14/6207/FIG4'"=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content-nw/full/65/14/6207/=
FIG4"=20
            target=3DFIG4>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><B>Figure 4.</B> Association of =
ABCG2=20
            expression with cell division. <I>B-C</I> and <I>E-F,</I> =
cells that=20
            have just undergone nuclear division but have not undergone=20
            cytokinesis (<I>arrows</I>). By contrast, cells in (<I>G-I, =
J-L</I>,=20
            and <I>M-O</I>) have just undergone cytokinesis. Cells in=20
            (<I>D-O</I>) were clonal cultures. Original magnifications, =
<FONT=20
            face=3Darial,helvetica>x</FONT>400.
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR><A=20
name=3DFIG5><!-- 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://cancerres.aacrjournals.org/cgi/content/full/65/14/6207/FIG=
5"><IMG=20
            height=3D200 alt=3D" " hspace=3D10=20
            =
src=3D"http://cancerres.aacrjournals.org/content/vol65/issue14/images/sma=
ll/05-0592f05g.gif"=20
            width=3D109 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (32K):<BR><NOBR><A=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207/FIG=
5">[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('FIG5', 389, 640); =
this.href=3D'/cgi/content-nw/full/65/14/6207/FIG5'"=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content-nw/full/65/14/6207/=
FIG5"=20
            target=3DFIG5>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><B>Figure 5.</B> Proliferative =
and=20
            self-renewal properties of ABCG2<SUP>+</SUP> and =
ABCG2<SUP>-</SUP>=20
            tumor cells. Purified ABCG2<SUP>+</SUP> and =
ABCG2<SUP>-</SUP> Du145=20
            (<I>A</I>) or MDA-MB435 (<I>B</I>) cells were plated for =
either 3=20
            hours or cultured for the time periods indicated. Cells were =
pulsed=20
            with BrdUrd for 3 hours before the end of each time point.=20
            <I>Columns,</I> mean % BrdUrd<SUP>+</SUP> cells from two =
experiments=20
            with 500 to 1,200 total cells counted; <I>bars,</I> =B1SE. =
*, <I>P</I>=20
            &lt; 0.001 (<I>t</I> test). #, <I>P</I> &lt; 0.01 (<I>A</I>) =
or=20
            &lt;0.05 (<I>B</I>). Purified ABCG2<SUP>+</SUP> and=20
            ABCG2<SUP>-</SUP> Du145 (<I>C</I>) or MDA-MB435 (<I>D</I>) =
cells=20
            were plated at clone density (400 cells per well) and =
cultured for=20
            the times indicated. At the end, the numbers of clones were=20
            quantified. % Cloning efficiency. *, <I>P</I> &lt; 0.01. =
Purified=20
            ABCG2<SUP>+</SUP> and ABCG2<SUP>-</SUP> Du145 (<I>E</I> and=20
            <I>G</I>) or MDA-MB435 (<I>F</I> and <I>H</I>) cells were =
plated at=20
            clone density (100 cells per well) and cultured for 7 =
(<I>E</I> and=20
            <I>F</I>), 14 (<I>G</I>), or 11 (<I>H</I>) days. At the end, =
the=20
            numbers of cells in each clone were counted and clones were =
grouped=20
            according to their sizes. On average 100 to 200 clones were =
randomly=20
            counted for each condition. Representative of two =
independent=20
            experiments. *, <I>P</I> &lt; 0.05.
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR><B>ABCG2<SUP>+</SUP>=20
and ABCG2<SUP>=96</SUP> tumor cells are similarly tumorigenic.</B><SUP>=20
</SUP>Next, we purified ABCG2<SUP>+</SUP> and ABCG2<SUP>=96</SUP> cells =
and did=20
tumor<SUP> </SUP>experiments to determine whether the ABCG2<SUP>+</SUP> =
cancer=20
cells might<SUP> </SUP>be more tumorigenic. Much to our surprise, when =
the two=20
populations<SUP> </SUP>of U373 cells were injected into the NOD/SCID =
mice, we=20
did not<SUP> </SUP>observe any major differences with respect to their=20
tumorigenicities<SUP> </SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#TBL=
3">Table=20
3</A>). In fact, the ABCG2<SUP>=96</SUP> cells tended to generate<SUP>=20
</SUP>tumors slightly faster than the ABCG2<SUP>+</SUP> or unsorted =
cells (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#TBL=
3">Table=20
3</A>).<SUP> </SUP><SUP></SUP>
<P><A name=3DTBL3><!-- 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://cancerres.aacrjournals.org/cgi/content/full/65/14/6207/TBL=
3">[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('TBL3', 500, 400); =
this.href=3D'/cgi/content-nw/full/65/14/6207/TBL3'"=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content-nw/full/65/14/6207/=
TBL3"=20
            target=3DTBL3>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><B>Table 3.</B> ABCG2 and =
tumorigenesis
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR>To=20
determine whether the lack of correlation between ABCG2 expression<SUP>=20
</SUP>and tumorigenicity may be a cell type=96restricted =
phenomenon,<SUP> </SUP>we=20
carried out similar tumor experiments using purified =
ABCG2<SUP>+</SUP><SUP>=20
</SUP>and ABCG2<SUP>=96</SUP> cells from prostate (Du145), breast=20
(MDA-MB435),<SUP> </SUP>and colon (HCT116) cancer cell cultures. In =
every case,=20
we failed<SUP> </SUP>to observe any significant difference in tumor =
incidence=20
or<SUP> </SUP>latency periods between the two populations (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#TBL=
3">Table=20
3</A>; data not<SUP> </SUP>shown). We also compared the =
ABCG2<SUP>+</SUP> and=20
ABCG2<SUP>=96</SUP> cells purified<SUP> </SUP>from Du145 xenograft =
tumors and=20
again did not observe any major<SUP> </SUP>differences in their =
tumorigenicities=20
(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#TBL=
3">Table=20
3</A>).<SUP> </SUP>
<P><B>Evidence that ABCG2 expression marks proliferating tumor =
progenitors<SUP>=20
</SUP>whereas ABCG2<SUP>=96</SUP> population contains primitive cancer =
stem<SUP>=20
</SUP>cells.</B> If the ABCG2<SUP>+</SUP> cells proliferate faster than =
the=20
ABCG2<SUP>=96</SUP><SUP> </SUP>cancer cells, why are they not more =
tumorigenic?=20
One possibility<SUP> </SUP>is that ABCG2<SUP>+</SUP> cells are mostly =
fast=20
proliferating tumor progenitors<SUP> </SUP>(i.e., transit amplifying =
cells)=20
rather than primitive, slow-cycling<SUP> </SUP>CSCs. To test this =
possibility,=20
we first determined whether<SUP> </SUP>the ABCG2<SUP>+</SUP> tumor cells =
could=20
generate ABCG2<SUP>=96</SUP> cells and,<SUP> </SUP>more importantly, =
whether=20
ABCG2<SUP>=96</SUP> cells could generate<SUP> </SUP>ABCG2<SUP>+</SUP> =
cells. As=20
shown in <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#TBL=
4">Table=20
4</A>, tumors derived from the ABCG2<SUP>+</SUP><SUP> </SUP>cancer cells =
all=20
contained only a fraction of ABCG2<SUP>+</SUP> cells (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#TBL=
4">Table=20
4</A>),<SUP> </SUP>suggesting that ABCG2<SUP>+</SUP> cells generated=20
ABCG2<SUP>=96</SUP> tumor<SUP> </SUP>cells <I>in vivo</I>. Except for =
one tumor=20
derived from the 1,000 ABCG2<SUP>+</SUP><SUP> </SUP>Du145 cells, we =
detected=20
only small percentages of ABCG2<SUP>+</SUP> cells<SUP> </SUP>in all =
other tumors=20
derived from the ABCG2<SUP>+</SUP> tumor cells (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#TBL=
4">Table=20
4</A>).<SUP> </SUP>On the other hand, tumors derived from the=20
ABCG2<SUP>=96</SUP><SUP> </SUP>cells also contained a small fraction of=20
ABCG2<SUP>+</SUP> cells (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#TBL=
4">Table=20
4</A>),<SUP> </SUP>suggesting that some ABCG2<SUP>=96</SUP> cells also =
have the=20
ability<SUP> </SUP>to generate ABCG2<SUP>+</SUP> tumor cells.<SUP> =
</SUP>
<P><A name=3DTBL4><!-- 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://cancerres.aacrjournals.org/cgi/content/full/65/14/6207/TBL=
4">[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('TBL4', 500, 400); =
this.href=3D'/cgi/content-nw/full/65/14/6207/TBL4'"=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content-nw/full/65/14/6207/=
TBL4"=20
            target=3DTBL4>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><B>Table 4.</B> =
ABCG2<SUP>+</SUP> and=20
            ABCG2<SUP>=96</SUP> cells in tumors
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR>Next,=20
we did a series of clonal analyses to determine the relationship<SUP>=20
</SUP>between ABCG2<SUP>+</SUP> and ABCG2<SUP>=96</SUP> cancer cells. =
Although=20
freshly<SUP> </SUP>purified ABCG2<SUP>+</SUP> Du145 (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
5">Fig.=20
5<I>A</I></A>; 3 hours) or MDA-MB435 (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
5">Fig.<SUP>=20
</SUP>5<I>B</I></A>; 3 hours) cells proliferated faster than their=20
corresponding<SUP> </SUP>ABCG2<SUP>=96</SUP> counterparts, culture for =
as short as=20
1 day eliminated<SUP> </SUP>or reduced this proliferative difference. =
Continued=20
cultures<SUP> </SUP>of these cells revealed increasing proliferating =
(i.e.,=20
BrdU<SUP>+</SUP>)<SUP> </SUP>cells in the ABCG2<SUP>=96</SUP> =
populations (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
5">Fig.=20
5<I>A-B</I></A>). These results<SUP> </SUP>suggest the possibility that, =
with=20
time in culture, the ABCG2<SUP>+</SUP><SUP> </SUP>tumor progenitors =
gradually=20
lose their proliferative capacity<SUP> </SUP>whereas primitive CSCs in =
the=20
ABCG2<SUP>=96</SUP> population give rise<SUP> </SUP>to highly =
proliferative=20
ABCG2<SUP>+</SUP> tumor progenitors. In support,<SUP> =
</SUP>immunostaining=20
revealed the emergence of ABCG2<SUP>+</SUP> cells from the<SUP> =
</SUP>starting=20
ABCG2<SUP>=96</SUP> cancer cells within 1 week (data not shown),<SUP>=20
</SUP>consistent with the ability of some ABCG2<SUP>=96</SUP> tumor =
cells<SUP>=20
</SUP>to generate ABCG2<SUP>+</SUP> cells <I>in vivo</I> (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#TBL=
4">Table=20
4</A>).<SUP> </SUP>
<P>Consistent with the BrdU incorporation assays, clonal analyses<SUP>=20
</SUP>revealed that at earlier time points the ABCG2<SUP>+</SUP> tumor=20
cells<SUP> </SUP>had higher cloning efficiency; that is, more cells had =
the=20
ability<SUP> </SUP>to establish a clone (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
5">Fig.=20
5<I>C-D</I></A>). However, at later time points,<SUP> </SUP>the=20
ABCG2<SUP>=96</SUP> tumor cells picked up and formed similar or<SUP> =
</SUP>higher=20
(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
5">Fig.=20
5<I>C-D</I></A>) percentages of clones. Subsequently, we carried<SUP> =
</SUP>out=20
differential clonal analyses in which purified ABCG2<SUP>+</SUP> =
and<SUP>=20
</SUP>ABCG2<SUP>=96</SUP> tumor cells were plated at clonal density and=20
clonal<SUP> </SUP>sizes were quantified at a shorter and a longer time=20
point.<SUP> </SUP>As shown in <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
5">Fig.=20
5<I>E</I></A>, 7 days after plating, more ABCG2<SUP>+</SUP> Du145<SUP>=20
</SUP>cells formed larger clones. However, at 14 days post plating,<SUP> =

</SUP>there were significantly more large clones derived from the<SUP>=20
</SUP>ABCG2<SUP>=96</SUP> Du145 cells (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
5">Fig.=20
5<I>G</I></A>). The average clonal sizes<SUP> </SUP>(cells/clone) of the =

ABCG2<SUP>+</SUP> versus ABCG2<SUP>=96</SUP> Du145 cells<SUP> </SUP>were =
101 and=20
60 cells at 7 days versus 4,716 and 5,658 cells<SUP> </SUP>at 14 days,=20
respectively (<I>P</I> &lt; 0.01 in both cases, ANOVA).<SUP> =
</SUP>Similarly,=20
more ABCG2<SUP>+</SUP> MDA-MB435 cells formed larger clones<SUP> =
</SUP>than the=20
ABCG2<SUP>=96</SUP> MDA-MB435 cells at 7 days after plating<SUP> =
</SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
5">Fig.=20
5<I>F</I></A>). However, by 11 days after plating, there were =
significantly<SUP>=20
</SUP>more large clones (i.e., &gt;500 cells per clone) derived =
from<SUP>=20
</SUP>the ABCG2<SUP>=96</SUP> MDA-MB435 cells (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
5">Fig.=20
5<I>H</I></A>). The average clonal<SUP> </SUP>sizes of the =
ABCG2<SUP>+</SUP>=20
versus ABCG2<SUP>=96</SUP> MDA-MB435 cells were<SUP> </SUP>30 and 16 =
cells at 7=20
days (<I>P</I> &lt; 0.01) versus 346 and 356 cells<SUP> </SUP>at 11 =
days,=20
respectively. Together, the proliferation (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
5">Fig.<SUP>=20
</SUP>5<I>A-B</I></A>) and clonal (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
5">Fig.=20
5<I>C-H</I></A>) analyses provide strong evidence<SUP> </SUP>that the=20
ABCG2<SUP>+</SUP> tumor cells likely represent fast-proliferating<SUP>=20
</SUP>tumor progenitor cells, whereas the ABCG2<SUP>=96</SUP> =
population<SUP>=20
</SUP>contains slow-cycling, primitive CSC cells that, with time,<SUP>=20
</SUP>could establish robust clonal growth and also generate =
fast-cycling<SUP>=20
</SUP>progenitor cells.<SUP> </SUP>
<P>Finally, we did RT-PCR analysis to assess the mRNA expression<SUP> =
</SUP>of=20
several stemness genes (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
6">Fig.=20
6<I>A-B</I></A>). Consistent with the concept<SUP> </SUP>that the=20
ABCG2<SUP>=96</SUP> population contains primitive, stem-like<SUP> =
</SUP>cancer=20
cells, we found that purified ABCG2<SUP>=96</SUP> tumor cells<SUP> =
</SUP>expressed=20
higher mRNA levels of Notch-1, =DF-catenin,<SUP> </SUP>and SMO (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
6">Fig.=20
6<I>A-B</I></A>). Even Oct-4, a transcription factor essential<SUP> =
</SUP>for=20
embryonic stem cell self-renewal (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B51=
">51</A>)=20
and recently shown<SUP> </SUP>to be expressed in some adult stem cells =
(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B52=
">52</A>),=20
also showed preferential<SUP> </SUP>expression in the =
ABCG2<SUP>=96</SUP> cells in=20
three of four cell types<SUP> </SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
6">Fig.=20
6<I>A</I></A>). Interestingly, the Notch-1 mRNA was detected nearly<SUP> =

</SUP>exclusively in the ABCG2<SUP>=96</SUP> tumor cells (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
6">Fig.=20
6<I>A</I></A>). Similarly,<SUP> </SUP>the =DF-catenin mRNA was observed =
only in=20
the ABCG2<SUP>=96</SUP><SUP> </SUP>Du145 cells (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
6">Fig.=20
6<I>B</I></A>). These RT-PCR results provide strong support<SUP> =
</SUP>for the=20
existence of primitive CSC in the ABCG2<SUP>=96</SUP> tumor<SUP> =
</SUP>cell=20
population.<SUP> </SUP>
<P><A name=3DFIG6><!-- 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://cancerres.aacrjournals.org/cgi/content/full/65/14/6207/FIG=
6"><IMG=20
            height=3D151 alt=3D" " hspace=3D10=20
            =
src=3D"http://cancerres.aacrjournals.org/content/vol65/issue14/images/sma=
ll/05-0592f06g.gif"=20
            width=3D200 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (37K):<BR><NOBR><A=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207/FIG=
6">[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('FIG6', 590, 533); =
this.href=3D'/cgi/content-nw/full/65/14/6207/FIG6'"=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content-nw/full/65/14/6207/=
FIG6"=20
            target=3DFIG6>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><B>Figure 6.</B> =
ABCG2<SUP>-</SUP> cancer=20
            cells express higher levels of stemness genes. <I>A-B,</I> =
RT-PCR=20
            analysis of stemness genes using purified ABCG2<SUP>+</SUP> =
(+) and=20
            ABCG2<SUP>-</SUP> (=96) cancer cells. Negative controls =
(<I>Neg.=20
            CTL</I>) refer to RT using H<SUB>2</SUB>O and positive =
control=20
            (<I>Pos. CTL</I>) in (<I>H</I>) refers to unsorted Du145 =
cells=20
            previously shown to express =DF-catenin.<A =
name=3DRFN1></A><SUP><A=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FN1=
">3</A></SUP>=20
            <I>C,</I> a hypothetical model. See text for more =
discussion.
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR><A=20
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 =
height=3D21=20
      alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.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://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#top=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Top<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#ABS=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Abstract<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#SEC=
1"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Introduction<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#SEC=
2"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Materials and Methods<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#SEC=
3"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Results<BR></A><IMG height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/dot.gif" =
width=3D11=20
      border=3D0><FONT color=3D#464c53>Discussion</FONT><BR><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#BIB=
L"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/darrow.gif" =
width=3D11=20
      =
border=3D0>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>A=
=20
long-time puzzle to tumor biologists is the observations that<SUP> =
</SUP>even=20
with long-term cultured cancer cells, in general sufficient<SUP> =
</SUP>numbers=20
of cells have to be injected to initiate an orthotopic<SUP> </SUP>tumor =
in=20
recipient animals (reviewed in refs. <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B1"=
>1</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B47=
">47</A>),=20
suggesting<SUP> </SUP>that even in long-term tumor cell cultures, not =
all cells=20
are<SUP> </SUP>equal and only a small population of cells is =
tumorigenic.=20
Indeed,<SUP> </SUP>when multiple human cancer cells, which have been in=20
culture<SUP> </SUP>under different conditions for years or even decades =
are=20
assessed<SUP> </SUP>for their clonal growth and clonogenic potentials, =
we find=20
that<SUP> </SUP>only a small percentage of cells possesses such =
potentials.<A=20
name=3DRFN1></A><SUP><A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FN1=
">3</A></SUP><SUP>=20
</SUP>Furthermore, when tumor cell=96derived spheres or xenograft<SUP>=20
</SUP>tumors <I>in situ</I> are pulsed with BrdU followed by extended=20
chase,<SUP> </SUP>only a very minor population of the cells manifests as =
the=20
long-term<SUP> </SUP>LRCs,<A name=3DRFN1></A><SUP><A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FN1=
">3</A></SUP>=20
which are known to preferentially identify stem cells<SUP> </SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B2"=
>2</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B5"=
>5</A>).=20
In further support, long-term cultured rat C6 glioma<SUP> </SUP>cells =
(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B48=
">48</A>)=20
and some human brain tumor (i.e., glioma and medulloblastoma;<SUP> =
</SUP>ref. <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B37=
">37</A>)=20
cells are found to contain a side population, which<SUP> </SUP>is known =
to be=20
enriched in stem cells (see Introduction). Importantly,<SUP> </SUP>the =
C6 side=20
population cells are more tumorigenic than and can<SUP> </SUP>also =
generate the=20
non=96side population cells (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B48=
">48</A>),=20
providing<SUP> </SUP>the first direct evidence for a population of more=20
tumorigenic<SUP> </SUP>cells in long-term tumor cell cultures. It is =
these=20
observations<SUP> </SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B37=
">37</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B48=
">48</A>)<A=20
name=3DRFN1></A><SUP><A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FN1=
">3</A></SUP>=20
that have prompted us to first determine whether the<SUP> </SUP>side =
population=20
technique can be generally applied to other<SUP> </SUP>cultured human =
tumor=20
cells, in particular, the human epithelial<SUP> </SUP>cancer cells.<SUP> =
</SUP>
<P>Our results reveal that <IMG alt=3D~=20
src=3D"http://cancerres.aacrjournals.org/math/sim.gif" border=3D0>30% =
cultured human=20
cancer cell lines<SUP> </SUP>and xenograft tumor-derived cells possess a =
side=20
population<SUP> </SUP>that can be reliably detected under the current=20
experimental<SUP> </SUP>conditions. Several notable points are worthy of =

mention. First,<SUP> </SUP>in most literature reports, the side =
population is=20
identified<SUP> </SUP>on either a MoFlo or FACS Vantage flow cytometer =
as a=20
continuous<SUP> </SUP>tail of the non=96side population. Therefore, the=20
discrimination<SUP> </SUP>of the side population from the non=96side =
population=20
is,<SUP> </SUP>to a certain extent, arbitrary and can vary significantly =

from<SUP> </SUP>experiment to experiment. In contrast, using a Coulter=20
Epics<SUP> </SUP>flow cytometer and our modified protocol, we have in =
most=20
cases<SUP> </SUP>identified the side population as a distinct "side"=20
population<SUP> </SUP>separate from the main non=96side population. This =

could<SUP> </SUP>potentially give us relatively pure side population =
cells.=20
Second,<SUP> </SUP>in support of this possibility, our system seems to=20
identify<SUP> </SUP>the side population cells in a more stringent manner =
and=20
the<SUP> </SUP>percentages of the side population cells may be more=20
representative<SUP> </SUP>of putative CSCs in the cultures or xenograft =
tumors.=20
Therefore,<SUP> </SUP>only <IMG alt=3D~=20
src=3D"http://cancerres.aacrjournals.org/math/sim.gif" border=3D0>30% =
cultured human=20
cancer cell lines and xenograft tumor-derived<SUP> </SUP>cells possess a =
side=20
population of 0.04% to 0.2%. These percentages<SUP> </SUP>are similar to =
the=20
side population of multiple normal stem cell<SUP> </SUP>or progenitor =
cell=20
populations [i.e., 0.01-5%; refs. <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B18=
">18</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B23=
">23</A>,<SUP>=20
</SUP><A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B26=
">26</A>;=20
e.g., mouse bone marrow (0.01%; <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
1">Fig.=20
1</A>), newborn mouse keratinocyte<SUP> </SUP>progenitors (0.5%; <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
1">Fig.=20
1</A>), and human bone marrow (<IMG alt=3D~=20
src=3D"http://cancerres.aacrjournals.org/math/sim.gif" border=3D0>0.03%; =
ref.<SUP>=20
</SUP><A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B8"=
>8</A>)].=20
The majority of the cancer cell lines or xenograft tumors<SUP> =
</SUP>examined=20
seems to possess too small a side population to be<SUP> </SUP>reliably=20
detected.<SUP> </SUP>
<P>Importantly, the side population cells purified from two cell<SUP>=20
</SUP>lines and one xenograft tumor are more tumorigenic than the<SUP>=20
</SUP>non=96side population counterparts. Furthermore, the side<SUP>=20
</SUP>population cells are found to possess several intrinsic =
properties<SUP>=20
</SUP>of stem cells: self-renewal, preferential expression of some<SUP>=20
</SUP>stemness genes, and an ability to give rise to non=96side<SUP>=20
</SUP>population cells. These results thus extend the others =
studies<SUP>=20
</SUP>on rat C6 glioma cells (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B48=
">48</A>)=20
and support the concept that the<SUP> </SUP>side population is indeed =
enriched=20
in stem-like tumorigenic<SUP> </SUP>cells. It should be noted that with =
higher=20
numbers of the non=96side<SUP> </SUP>population epithelial cancer cells =
(i.e.,=20
MCF7 and LAPC-9) injected,<SUP> </SUP>we also observed tumor =
development. These=20
results may suggest<SUP> </SUP>that the non=96side population also =
contains a very=20
small<SUP> </SUP>percentage of tumorigenic cells, although the results=20
might<SUP> </SUP>have stemmed from the contamination of small numbers of =

the<SUP> </SUP>side population cells in the non=96side population as=20
epithelial<SUP> </SUP>cancer cells are very "sticky".<SUP> </SUP>
<P>The major focus of the current study is to address whether the<SUP>=20
</SUP>higher tumorigenicity associated with the side population =
cells<SUP>=20
</SUP>is related to ABCG2 expression. Because the side population<SUP>=20
</SUP>phenotype in some cell types is mainly mediated by ABCG2, the<SUP> =

</SUP>side population cells (e.g., in MCF7) express higher levels<SUP> =
</SUP>of=20
ABCG2 mRNA, ABCG2 is expressed only in a small subset of<SUP> =
</SUP>cancer=20
cells, and ABCG2 expression in cancer cells seems associated<SUP> =
</SUP>with=20
cell proliferation, it stands to reason that the ABCG2<SUP>+</SUP><SUP>=20
</SUP>cancer cells might or should be more tumorigenic than the=20
ABCG2<SUP>=96</SUP><SUP> </SUP>tumor cells. Surprisingly, however, =
highly purified=20
ABCG2<SUP>+</SUP> cells<SUP> </SUP>from several types of tumor cells are =
not=20
more tumorigenic than<SUP> </SUP>the corresponding ABCG2<SUP>=96</SUP> =
cells.=20
Further proliferation<SUP> </SUP>assays, clonal analyses, self-renewal, =
and=20
molecular studies<SUP> </SUP>suggest a model in which the =
ABCG2<SUP>=96</SUP>=20
population contains<SUP> </SUP>primitive stem-like cancer cells with =
higher=20
self-renewal (because<SUP> </SUP>of higher levels of stemness genes) and =

proliferative potentials<SUP> </SUP>but are normally slow cycling (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
6">Fig.=20
6<I>C</I></A>). These cells then give<SUP> </SUP>rise to =
ABCG2<SUP>+</SUP> tumor=20
progenitor cells that are more actively<SUP> </SUP>proliferating but =
possess=20
reduced self-renewal and long-term<SUP> </SUP>proliferative capacities =
(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
6">Fig.=20
6</A>). The ABCG2<SUP>+</SUP> tumor progenitor<SUP> </SUP>cells =
eventually give=20
rise to ABCG2<SUP>=96</SUP>, partially or even<SUP> </SUP>fully =
differentiated=20
tumor cells that constitute the bulk of<SUP> </SUP>tumor cell mass (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#FIG=
6">Fig.=20
6</A>).<SUP> </SUP>
<P>The side population has been shown to be very heterogeneous<SUP> =
</SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B10=
">10</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B27=
">27</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B28=
">28</A>).=20
Therefore, the side population detected in cancer<SUP> </SUP>cells might =
contain=20
several subsets of cells, one of which expresses<SUP> </SUP>ABCG2 thus=20
explaining the increased ABCG2 expression in the<SUP> </SUP>side =
population. The=20
higher tumorigenicity associated with the<SUP> </SUP>side population =
might be=20
conferred by combined effects of several<SUP> </SUP>other subpopulations =
of=20
cells in addition to the ABCG2<SUP>+</SUP> cells.<SUP> </SUP>For =
example, cells=20
expressing other ABC family members might<SUP> </SUP>also contribute to =
the=20
cancer cell side population phenotype.<SUP> </SUP>Indeed, it has been =
shown that=20
only a fraction of side population<SUP> </SUP>cells expresses ABCG2 (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B24=
">24</A>)=20
and that both side population and<SUP> </SUP>known stem/progenitor cells =
also=20
express other ABC transporters<SUP> </SUP>such as MDR-1 (i.e., ABCB1 or=20
P-glycoprotein), MRP-1 (ABCC1),<SUP> </SUP>and ABCA2 (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B36=
">36</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B37=
">37</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B39=
">39</A>).=20
In addition, enforced expression of<SUP> </SUP>MDR-1 in murine bone =
marrow cells=20
is sufficient to expand the<SUP> </SUP>side population (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#B40=
">40</A>).=20
We are currently using cultured cancer<SUP> </SUP>cells as well as =
xenograft and=20
primary human tumor samples to<SUP> </SUP>determine the molecular basis =
of the=20
higher tumorigenicity associated<SUP> </SUP>with the side population =
(e.g.,=20
amplification of oncogenes and/or<SUP> </SUP>mutations of specific tumor =

suppressors), dissect different<SUP> </SUP>subpopulations of the side =
population=20
with respect to their<SUP> </SUP>tumorigenic potentials, and elucidate =
the=20
interrelationship<SUP> </SUP>between the side population and several =
other=20
tumorigenic populations<SUP> </SUP>we have identified.<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 =
height=3D21=20
      alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.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><B>Grant support:</B>=20
NIH grants CA90297, AG023374, and P30 CA16672;<SUP> </SUP>NIEHS grant =
ES07784;=20
American Cancer Society grant RSG MGO-105961;<SUP> </SUP>Department of =
Defense=20
grant DAMD17-03-1-0137; Prostate Cancer<SUP> </SUP>Foundation; and M.D. =
Anderson=20
Cancer Center (PCRP and IRG).<SUP> </SUP>
<P>The costs of publication of this article were defrayed in part<SUP> =
</SUP>by=20
the payment of page charges. This article must therefore<SUP> </SUP>be =
hereby=20
marked <I>advertisement</I> in accordance with 18 U.S.C.<SUP> =
</SUP>Section 1734=20
solely to indicate this fact.<SUP> </SUP>
<P>We thank C. Conti, T-J. Liu, M. Andreef, and C. Sawyers for<SUP>=20
</SUP>providing cells; C. Carter for assistance in preparing mouse<SUP>=20
</SUP>bone marrow cells; the Histology Core for excellent =
assistance<SUP>=20
</SUP>in tissue processing and immunohistochemistry; the Animal =
Facility<SUP>=20
</SUP>Core for help in tumor experiments; E. Richie for her =
insights;<SUP>=20
</SUP>and members of the Tang lab for support and helpful =
discussion.<SUP>=20
</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 =
height=3D21=20
      alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.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=20
name=3D""><!-- null --></A><B>Note:</B> J. Zhou is currently at the =
Dermatology=20
Branch, National<SUP> </SUP>Cancer Institute, NIH, Building 10, Room =
12N262, 10=20
Center Drive,<SUP> </SUP>MSC 1908, Bethesda, MD 20892-1908.<SUP> </SUP>
<P><A name=3DFN1><!-- null --></A><SUP>3</SUP> C. Jeter et al. Stem-like =
cancer=20
cells in culture and xenograft<SUP> </SUP>tumors: expression and roles =
of=20
stemness genes, submitted for<SUP> </SUP>publication.<SUP> </SUP><A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#RFN=
1"><IMG=20
height=3D12 alt=3DBack =
src=3D"http://cancerres.aacrjournals.org/icons/back.gif"=20
width=3D12 border=3D0></A>
<P><A name=3DFN2><!-- null --></A><SUP>4</SUP> Unpublished =
observations.<SUP>=20
</SUP><A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#RFN=
2"><IMG=20
height=3D12 alt=3DBack =
src=3D"http://cancerres.aacrjournals.org/icons/back.gif"=20
width=3D12 border=3D0></A>
<P>Received 2/21/05. Revised 4/16/05. Accepted 4/28/05.
<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 =
height=3D21=20
      alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.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://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#top=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Top<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#ABS=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Abstract<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#SEC=
1"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Introduction<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#SEC=
2"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Materials and Methods<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#SEC=
3"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Results<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/14/6207#SEC=
4"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Discussion<BR></A><IMG height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/dot.gif" =
width=3D11=20
      border=3D0><FONT=20
color=3D#464c53>References</FONT><BR></FONT></TH></TR></TBODY></TABLE>&nb=
sp;<BR>
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breast=20
      cancer stem-like cells is required for viability and=20
      maintenance</STRONG><BR>PNAS, October&nbsp;9,&nbsp;2007; 104(41): =
16158 -=20
      16163. <BR><A=20
      =
href=3D"http://www.pnas.org/cgi/content/abstract/104/41/16158">[Abstract]=
</A>=20
      <A =
href=3D"http://www.pnas.org/cgi/content/full/104/41/16158">[Full=20
      Text]</A> <A =
href=3D"http://www.pnas.org/cgi/reprint/104/41/16158">[PDF]</A>=20
      <BR><IMG height=3D1 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D499>=20
    </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.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://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://jnci.oxfordjournals.org/"><IMG height=3D80 =
alt=3D"Home page"=20
      =
src=3D"http://jnci.oxfordjournals.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://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A=20
      href=3D"http://jnci.oxfordjournals.org/"><IMG height=3D16=20
      alt=3D"JNCI J Natl Cancer Inst"=20
      =
src=3D"http://cancerres.aacrjournals.org/icons/shared/searchall/journals/=
jnci.gif"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
      =
src=3D"http://cancerres.aacrjournals.org/icons/shared/search/homelink.gif=
"=20
      width=3D49 vspace=3D5 border=3D0></A><BR><FONT =
face=3Dverdana,arial,helvetica=20
      size=3D-1>R. P. Hill and R. Perris<BR><STRONG>"Destemming" Cancer =
Stem=20
      Cells</STRONG><BR>J Natl Cancer Inst, October&nbsp;3,&nbsp;2007; =
99(19):=20
      1435 - 1440. <BR><A=20
      =
href=3D"http://jnci.oxfordjournals.org/cgi/content/abstract/99/19/1435">[=
Abstract]</A>=20
      <A =
href=3D"http://jnci.oxfordjournals.org/cgi/content/full/99/19/1435">[Full=
=20
      Text]</A> <A=20
      =
href=3D"http://jnci.oxfordjournals.org/cgi/reprint/99/19/1435">[PDF]</A> =

      <BR><IMG height=3D1 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D499>=20
    </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.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://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.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
      =
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
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A=20
      href=3D"http://cancerres.aacrjournals.org/"><IMG height=3D16 =
alt=3D"Cancer Res."=20
      =
src=3D"http://cancerres.aacrjournals.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://cancerres.aacrjournals.org/icons/shared/search/homelink.gif=
"=20
      width=3D49 vspace=3D5 border=3D0></A><BR><FONT =
face=3Dverdana,arial,helvetica=20
      size=3D-1>S. E. Kern and D. Shibata<BR><STRONG>The Fuzzy Math of =
Solid Tumor=20
      Stem Cells: A Perspective</STRONG><BR>Cancer Res.,=20
      October&nbsp;1,&nbsp;2007; 67(19): 8985 - 8988. <BR><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/abstract/67/19/8985=
">[Abstract]</A>=20
      <A=20
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href=3D"http://cancerres.aacrjournals.org/cgi/content/full/67/19/8985">[F=
ull=20
      Text]</A> <A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/reprint/67/19/8985">[PDF]</=
A>=20
      <BR><IMG height=3D1 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D499>=20
    </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.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://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://annonc.oxfordjournals.org/"><IMG height=3D80 =
alt=3D"Home page"=20
      =
src=3D"http://annonc.oxfordjournals.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://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A=20
      href=3D"http://annonc.oxfordjournals.org/"><IMG height=3D16 =
alt=3D"Ann Oncol"=20
      =
src=3D"http://cancerres.aacrjournals.org/icons/shared/searchall/journals/=
annonc.gif"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
      =
src=3D"http://cancerres.aacrjournals.org/icons/shared/search/homelink.gif=
"=20
      width=3D49 vspace=3D5 border=3D0></A><BR><FONT =
face=3Dverdana,arial,helvetica=20
      size=3D-1>M. Mimeault and S. K. Batra<BR><STRONG>Interplay of =
distinct=20
      growth factors during epithelial mesenchymal transition of cancer=20
      progenitor cells and molecular targeting as novel cancer=20
      therapies</STRONG><BR>Ann. Onc., October&nbsp;1,&nbsp;2007; =
18(10): 1605 -=20
      1619. <BR><A=20
      =
href=3D"http://annonc.oxfordjournals.org/cgi/content/abstract/18/10/1605"=
>[Abstract]</A>=20
      <A=20
      =
href=3D"http://annonc.oxfordjournals.org/cgi/content/full/18/10/1605">[Fu=
ll=20
      Text]</A> <A=20
      =
href=3D"http://annonc.oxfordjournals.org/cgi/reprint/18/10/1605">[PDF]</A=
>=20
      <BR><IMG height=3D1 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D499>=20
    </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.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://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://stemcells.alphamedpress.org/"><IMG height=3D80 =
alt=3D"Home page"=20
      =
src=3D"http://stemcells.alphamedpress.org/portal_imgs/search_result.gif" =

      width=3D59 vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A=20
      href=3D"http://stemcells.alphamedpress.org/"><IMG height=3D16 =
alt=3D"Stem Cells"=20
      =
src=3D"http://cancerres.aacrjournals.org/icons/shared/searchall/journals/=
stemcells.gif"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
      =
src=3D"http://cancerres.aacrjournals.org/icons/shared/search/homelink.gif=
"=20
      width=3D49 vspace=3D5 border=3D0></A><BR><FONT =
face=3Dverdana,arial,helvetica=20
      size=3D-1>E. E. Bar, A. Chaudhry, A. Lin, X. Fan, K. Schreck, W. =
Matsui, S.=20
      Piccirillo, A. L. Vescovi, F. DiMeco, A. Olivi, <EM>et=20
      al.</EM><BR><STRONG>Cyclopamine-Mediated Hedgehog Pathway =
Inhibition=20
      Depletes Stem-Like Cancer Cells in Glioblastoma</STRONG><BR>Stem =
Cells,=20
      October&nbsp;1,&nbsp;2007; 25(10): 2524 - 2533. <BR><A=20
      =
href=3D"http://stemcells.alphamedpress.org/cgi/content/abstract/25/10/252=
4">[Abstract]</A>=20
      <A=20
      =
href=3D"http://stemcells.alphamedpress.org/cgi/content/full/25/10/2524">[=
Full=20
      Text]</A> <A=20
      =
href=3D"http://stemcells.alphamedpress.org/cgi/reprint/25/10/2524">[PDF]<=
/A>=20
      <BR><IMG height=3D1 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D499>=20
    </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.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://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.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
      =
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
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A=20
      href=3D"http://cancerres.aacrjournals.org/"><IMG height=3D16 =
alt=3D"Cancer Res."=20
      =
src=3D"http://cancerres.aacrjournals.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://cancerres.aacrjournals.org/icons/shared/search/homelink.gif=
"=20
      width=3D49 vspace=3D5 border=3D0></A><BR><FONT =
face=3Dverdana,arial,helvetica=20
      size=3D-1>B. Tang, N. Yoo, M. Vu, M. Mamura, J.-S. Nam, A. =
Ooshima, Z. Du,=20
      P.-Y. Desprez, M. R. Anver, A. M. Michalowska, <EM>et=20
      al.</EM><BR><STRONG>Transforming Growth Factor-{beta} Can Suppress =

      Tumorigenesis through Effects on the Putative Cancer Stem or Early =

      Progenitor Cell and Committed Progeny in a Breast Cancer Xenograft =

      Model</STRONG><BR>Cancer Res., September&nbsp;15,&nbsp;2007; =
67(18): 8643=20
      - 8652. <BR><A=20
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href=3D"http://cancerres.aacrjournals.org/cgi/content/abstract/67/18/8643=
">[Abstract]</A>=20
      <A=20
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href=3D"http://cancerres.aacrjournals.org/cgi/content/full/67/18/8643">[F=
ull=20
      Text]</A> <A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/reprint/67/18/8643">[PDF]</=
A>=20
      <BR><IMG height=3D1 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D499>=20
    </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.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://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.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
      =
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
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A=20
      href=3D"http://cancerres.aacrjournals.org/"><IMG height=3D16 =
alt=3D"Cancer Res."=20
      =
src=3D"http://cancerres.aacrjournals.org/icons/shared/searchall/journals/=
canres.gif"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
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src=3D"http://cancerres.aacrjournals.org/icons/shared/search/homelink.gif=
"=20
      width=3D49 vspace=3D5 border=3D0></A><BR><FONT =
face=3Dverdana,arial,helvetica=20
      size=3D-1>C. Wu, Q. Wei, V. Utomo, P. Nadesan, H. Whetstone, R. =
Kandel, J.=20
      S. Wunder, and B. A. Alman<BR><STRONG>Side Population Cells =
Isolated from=20
      Mesenchymal Neoplasms Have Tumor Initiating =
Potential</STRONG><BR>Cancer=20
      Res., September&nbsp;1,&nbsp;2007; 67(17): 8216 - 8222. <BR><A=20
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href=3D"http://cancerres.aacrjournals.org/cgi/content/abstract/67/17/8216=
">[Abstract]</A>=20
      <A=20
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href=3D"http://cancerres.aacrjournals.org/cgi/content/full/67/17/8216">[F=
ull=20
      Text]</A> <A=20
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href=3D"http://cancerres.aacrjournals.org/cgi/reprint/67/17/8216">[PDF]</=
A>=20
      <BR><IMG height=3D1 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D499>=20
    </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.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://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.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
      =
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
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A=20
      href=3D"http://cancerres.aacrjournals.org/"><IMG height=3D16 =
alt=3D"Cancer Res."=20
      =
src=3D"http://cancerres.aacrjournals.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://cancerres.aacrjournals.org/icons/shared/search/homelink.gif=
"=20
      width=3D49 vspace=3D5 border=3D0></A><BR><FONT =
face=3Dverdana,arial,helvetica=20
      size=3D-1>L. Patrawala, T. Calhoun-Davis, R. Schneider-Broussard, =
and D. G.=20
      Tang<BR><STRONG>Hierarchical Organization of Prostate Cancer Cells =
in=20
      Xenograft Tumors: The CD44+{alpha}2{beta}1+ Cell Population Is =
Enriched in=20
      Tumor-Initiating Cells</STRONG><BR>Cancer Res., =
July&nbsp;15,&nbsp;2007;=20
      67(14): 6796 - 6805. <BR><A=20
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href=3D"http://cancerres.aacrjournals.org/cgi/content/abstract/67/14/6796=
">[Abstract]</A>=20
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href=3D"http://cancerres.aacrjournals.org/cgi/content/full/67/14/6796">[F=
ull=20
      Text]</A> <A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/reprint/67/14/6796">[PDF]</=
A>=20
      <BR><IMG height=3D1 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D499>=20
    </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D5></TD></TR>
  <TR>
    <TD colSpan=3D6>
      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
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<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://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D25><BR></TD>
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      Y. Nakanuma<BR><STRONG>Histological and Culture Studies with =
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    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
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    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
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    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
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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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<TABLE class=3Dcontent_box_outer_table align=3Dright>
  <TBODY>
  <TR>
    <TD><!-- beginning of inner table -->
      <TABLE class=3Dcontent_box_inner_table><!-- citation -->
        <TBODY>
        <TR>
          <TD class=3Dcontent_box_title_highlight colSpan=3D2>This =
Article</TD></TR>
        <TR>
          <TD class=3Dcontent_box_space_between_sections =
colSpan=3D2><IMG height=3D1=20
            alt=3D" " =
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      }=0A=
      // open connection=0A=
      var url =3D new java.net.URL(new =
java.net.URL(window.location.href), this.url);=0A=
      var conn =3D url.openConnection();=0A=
      for (var i =3D 0; i < this._headers.length; i++) {=0A=
        conn.setRequestProperty(this._headers[i].h, this._headers[i].v);=0A=
      }=0A=
      this._headers =3D [];=0A=
      if (this.method =3D=3D 'POST') {=0A=
        // POST data=0A=
        conn.setDoOutput(true);=0A=
        var wr =3D new =
java.io.OutputStreamWriter(conn.getOutputStream(), this._getCharset());=0A=
        wr.write(data);=0A=
        wr.flush();=0A=
        wr.close();=0A=
      }=0A=
      // read response headers=0A=
      // NOTE: the getHeaderField() methods always return nulls for me :(=0A=
      var gotContentEncoding =3D false;=0A=
      var gotContentLength =3D false;=0A=
      var gotContentType =3D false;=0A=
      var gotDate =3D false;=0A=
      var gotExpiration =3D false;=0A=
      var gotLastModified =3D false;=0A=
      for (var i =3D 0; ; i++) {=0A=
        var hdrName =3D conn.getHeaderFieldKey(i);=0A=
        var hdrValue =3D conn.getHeaderField(i);=0A=
        if (hdrName =3D=3D null && hdrValue =3D=3D null) {=0A=
          break;=0A=
        }=0A=
        if (hdrName !=3D null) {=0A=
          this._headers[this._headers.length] =3D {h:hdrName, =
v:hdrValue};=0A=
          switch (hdrName.toLowerCase()) {=0A=
            case 'content-encoding': gotContentEncoding =3D true; break;=0A=
            case 'content-length'  : gotContentLength   =3D true; break;=0A=
            case 'content-type'    : gotContentType     =3D true; break;=0A=
            case 'date'            : gotDate            =3D true; break;=0A=
            case 'expires'         : gotExpiration      =3D true; break;=0A=
            case 'last-modified'   : gotLastModified    =3D true; break;=0A=
          }=0A=
        }=0A=
      }=0A=
      // try to fill in any missing header information=0A=
      var val;=0A=
      val =3D conn.getContentEncoding();=0A=
      if (val !=3D null && !gotContentEncoding) =
this._headers[this._headers.length] =3D {h:'Content-encoding', v:val};=0A=
      val =3D conn.getContentLength();=0A=
      if (val !=3D -1 && !gotContentLength) =
this._headers[this._headers.length] =3D {h:'Content-length', v:val};=0A=
      val =3D conn.getContentType();=0A=
      if (val !=3D null && !gotContentType) =
this._headers[this._headers.length] =3D {h:'Content-type', v:val};=0A=
      val =3D conn.getDate();=0A=
      if (val !=3D 0 && !gotDate) this._headers[this._headers.length] =
=3D {h:'Date', v:(new Date(val)).toUTCString()};=0A=
      val =3D conn.getExpiration();=0A=
      if (val !=3D 0 && !gotExpiration) =
this._headers[this._headers.length] =3D {h:'Expires', v:(new =
Date(val)).toUTCString()};=0A=
      val =3D conn.getLastModified();=0A=
      if (val !=3D 0 && !gotLastModified) =
this._headers[this._headers.length] =3D {h:'Last-modified', v:(new =
Date(val)).toUTCString()};=0A=
      // read response data=0A=
      var reqdata =3D '';=0A=
      var stream =3D conn.getInputStream();=0A=
      if (stream) {=0A=
        var reader =3D new java.io.BufferedReader(new =
java.io.InputStreamReader(stream, this._getCharset()));=0A=
        var line;=0A=
        while ((line =3D reader.readLine()) !=3D null) {=0A=
          if (this.readyState =3D=3D 2) {=0A=
            this.readyState =3D 3;=0A=
            if (this.onreadystatechange) {=0A=
              this.onreadystatechange();=0A=
            }=0A=
          }=0A=
          reqdata +=3D line + '\n';=0A=
        }=0A=
        reader.close();=0A=
        this.status =3D 200;=0A=
        this.statusText =3D 'OK';=0A=
        this.responseText =3D reqdata;=0A=
        this.readyState =3D 4;=0A=
        if (this.onreadystatechange) {=0A=
          this.onreadystatechange();=0A=
        }=0A=
        if (this.onload) {=0A=
          this.onload();=0A=
        }=0A=
      } else {=0A=
        // error=0A=
        this.status =3D 404;=0A=
        this.statusText =3D 'Not Found';=0A=
        this.responseText =3D '';=0A=
        this.readyState =3D 4;=0A=
        if (this.onreadystatechange) {=0A=
          this.onreadystatechange();=0A=
        }=0A=
        if (this.onerror) {=0A=
          this.onerror();=0A=
        }=0A=
      }=0A=
    };=0A=
  };=0A=
}=0A=
// ActiveXObject emulation=0A=
if (!window.ActiveXObject && window.XMLHttpRequest) {=0A=
  window.ActiveXObject =3D function(type) {=0A=
    switch (type.toLowerCase()) {=0A=
      case 'microsoft.xmlhttp':=0A=
      case 'msxml2.xmlhttp':=0A=
      case 'msxml2.xmlhttp.3.0':=0A=
      case 'msxml2.xmlhttp.4.0':=0A=
      case 'msxml2.xmlhttp.5.0':=0A=
        return new XMLHttpRequest();=0A=
    }=0A=
    return null;=0A=
  };=0A=
}=0A=

------=_NextPart_000_004B_01C87610.AA478FB0
Content-Type: application/octet-stream
Content-Transfer-Encoding: quoted-printable
Content-Location: http://cancerres.aacrjournals.org/javascript/ajax/utility.js

/************************************************************************=
*****=0A=
 * javascript/ajax/utility.js=0A=
 *=0A=
 * Utility functions for working with XMLHttpRequest data.=0A=
 *=0A=
 * Copyright 2006 Board of Trustees of the Leland Stanford Junior =
University.=0A=
 =
*************************************************************************=
***/=0A=
=0A=
/*=0A=
 * Copy XML nodes into an HTMLElement. This effectively=0A=
 * clones XML markup which uses XHTML naming conventions=0A=
 * into an HTML DOM.=0A=
 */=0A=
function copy_xml_to_html(src, dst) {=0A=
  if (src.nodeType =3D=3D 1) { /* Node.ELEMENT_NODE */=0A=
    var e =3D document.createElement(src.nodeName);=0A=
    for (var i =3D 0; i < src.childNodes.length; i++) {=0A=
	  copy_xml_to_html(src.childNodes[i], e);=0A=
    }=0A=
    for (var i =3D 0; i < src.attributes.length; i++) {=0A=
      var n =3D src.attributes[i].name;=0A=
      var v =3D unescape_xml_string(src.attributes[i].value);      =0A=
      e.setAttribute(n, v);=0A=
      if (n =3D=3D "class") {=0A=
        e.className =3D v;=0A=
      }=0A=
      else if (n =3D=3D "style") {=0A=
        set_css_style(v, e, "");=0A=
      }=0A=
    }=0A=
    dst.appendChild(e);=0A=
  }=0A=
  else if (src.nodeType =3D=3D 3) { /* Node.TEXT_NODE */=0A=
    dst.appendChild(document.createTextNode(src.nodeValue));=0A=
  }=0A=
}=0A=
=0A=
/* =0A=
 * It is unclear that this is the right thing to be calling=0A=
 * from copy_xml_to_html, but it appears that Safari decides=0A=
 * to convert &amp; to the NCR &#35;, and then encodes that=0A=
 * NCR to &%26%2338;.  So, I'm going to treat the DOM Attr=0A=
 * value as a plain string, and run our XML string input=0A=
 * through the decoding routine below.=0A=
 */=0A=
function unescape_xml_string(s) {=0A=
  return s.replace(/&apos;/g, "'")=0A=
          .replace(/&#39;/g,  "'")=0A=
          .replace(/&quot;/g, "\"")=0A=
          .replace(/&#34;/g,  "\"")=0A=
          .replace(/&gt;/g,   ">")=0A=
          .replace(/&#62;/g,  ">")=0A=
          .replace(/&lt;/g,   "<")=0A=
          .replace(/&#60;/g,  "<")=0A=
          .replace(/&amp;/g,  "&")=0A=
          .replace(/&#38;/g,  "&");=0A=
}=0A=
=0A=
/*=0A=
 * Parse set of CSS rules and apply them to an element.=0A=
 * This is quite horrifying, but I'm unable to determine=0A=
 * how else to handle this with IE 6.  FireFox and other=0A=
 * sane browsers let you simply set the style attribute=0A=
 * or use e.style.setProperty(rule, value, priority),=0A=
 * IE 6 appears to have neither of these capabilities..=0A=
 */=0A=
function set_css_style(css, e, priority) {=0A=
  var rules =3D css.split(";");=0A=
  for (var i =3D 0; i < rules.length; i++) {=0A=
    var nvpair =3D rules[i].split(":");=0A=
    if (nvpair.length =3D=3D 2) {=0A=
      try {=0A=
        var name  =3D nvpair[0]; /* style attribute */=0A=
        var value =3D nvpair[1]; /* attribute value */=0A=
  =0A=
        /*=0A=
         * For each possible style attribute, set the=0A=
         * appropriate style property in the element.=0A=
         */=0A=
        if (name =3D=3D "background") {=0A=
           e.style.background =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-attachment") {=0A=
          e.style.backgroundAttachment =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-color") {=0A=
          e.style.backgroundColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-image") {=0A=
          e.style.backgroundImage =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-position") {=0A=
          e.style.backgroundPosition =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-position-x") {=0A=
          e.style.backgroundPositionX =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-position-y") {=0A=
          e.style.backgroundPositionY =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-repeat") {=0A=
          e.style.backgroundRepeat =3D value;=0A=
        }=0A=
        else if (name =3D=3D "behavior") {=0A=
          e.style.behavior =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border") {=0A=
          e.style.border =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-bottom") {=0A=
          e.style.borderBottom =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-bottom-color") {=0A=
          e.style.borderBottomColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-bottom-style") {=0A=
          e.style.borderBottomStyle =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-bottom-width") {=0A=
          e.style.borderBottomWidth =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-collapse") {=0A=
          e.style.borderCollapse =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-color") {=0A=
          e.style.borderColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-left") {=0A=
          e.style.borderLeft =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-left-color") {=0A=
          e.style.borderLeftColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-left-style") {=0A=
          e.style.borderLeftStyle =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-left-width") {=0A=
          e.style.borderLeftWidth =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-right") {=0A=
          e.style.borderRight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-right-color") {=0A=
          e.style.borderRightColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-right-style") {=0A=
          e.style.borderRightStyle =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-right-width") {=0A=
          e.style.borderRightWidth =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-style") {=0A=
          e.style.borderStyle =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-top") {=0A=
          e.style.borderTop =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-top-color") {=0A=
          e.style.borderTopColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-top-style") {=0A=
          e.style.borderTopStyle =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-top-width") {=0A=
          e.style.borderTopWidth =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-width") {=0A=
          e.style.borderWidth =3D value;=0A=
        }=0A=
        else if (name =3D=3D "bottom") {=0A=
          e.style.bottom =3D value;=0A=
        }=0A=
        else if (name =3D=3D "clear") {=0A=
          e.style.clear =3D value;=0A=
        }=0A=
        else if (name =3D=3D "clip") {=0A=
          e.style.clip =3D value;=0A=
        }=0A=
        else if (name =3D=3D "color") {=0A=
          e.style.color =3D value;=0A=
        }=0A=
        else if (name =3D=3D "cssText") {=0A=
          e.style.Sets =3D value;=0A=
        }=0A=
        else if (name =3D=3D "cursor") {=0A=
          e.style.cursor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "direction") {=0A=
          e.style.direction =3D value;=0A=
        }=0A=
        else if (name =3D=3D "display") {=0A=
          e.style.display =3D value;=0A=
        }=0A=
        else if (name =3D=3D "font") {=0A=
          e.style.font =3D value;=0A=
        }=0A=
        else if (name =3D=3D "font-family") {=0A=
          e.style.fontFamily =3D value;=0A=
        }=0A=
        else if (name =3D=3D "font-size") {=0A=
          e.style.fontSize =3D value;=0A=
        }=0A=
        else if (name =3D=3D "font-style") {=0A=
          e.style.fontStyle =3D value;=0A=
        }=0A=
        else if (name =3D=3D "font-variant") {=0A=
          e.style.fontVariant =3D value;=0A=
        }=0A=
        else if (name =3D=3D "font-weight") {=0A=
          e.style.fontWeight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "height") {=0A=
          e.style.height =3D value;=0A=
        }=0A=
        else if (name =3D=3D "ime-mode") {=0A=
          e.style.imeMode =3D value;=0A=
        }=0A=
        else if (name =3D=3D "layout-flow") {=0A=
          e.style.layoutFlow =3D value;=0A=
        }=0A=
        else if (name =3D=3D "layout-grid") {=0A=
          e.style.layoutGrid =3D value;=0A=
        }=0A=
        else if (name =3D=3D "layout-grid-char") {=0A=
          e.style.layoutGridChar =3D value;=0A=
        }=0A=
        else if (name =3D=3D "layout-grid-line") {=0A=
          e.style.layoutGridLine =3D value;=0A=
        }=0A=
        else if (name =3D=3D "layout-grid-mode") {=0A=
          e.style.layoutGridMode =3D value;=0A=
        }=0A=
        else if (name =3D=3D "layout-grid-type") {=0A=
          e.style.layoutGridType =3D value;=0A=
        }=0A=
        else if (name =3D=3D "left") {=0A=
          e.style.left =3D value;=0A=
        }=0A=
        else if (name =3D=3D "letter-spacing") {=0A=
          e.style.letterSpacing =3D value;=0A=
        }=0A=
        else if (name =3D=3D "line-break") {=0A=
          e.style.lineBreak =3D value;=0A=
        }=0A=
        else if (name =3D=3D "line-height") {=0A=
          e.style.lineHeight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "list-style") {=0A=
          e.style.listStyle =3D value;=0A=
        }=0A=
        else if (name =3D=3D "list-style-image") {=0A=
          e.style.listStyleImage =3D value;=0A=
        }=0A=
        else if (name =3D=3D "list-style-position") {=0A=
          e.style.listStylePosition =3D value;=0A=
        }=0A=
        else if (name =3D=3D "list-style-type") {=0A=
          e.style.listStyleType =3D value;=0A=
        }=0A=
        else if (name =3D=3D "margin") {=0A=
          e.style.margin =3D value;=0A=
        }=0A=
        else if (name =3D=3D "margin-bottom") {=0A=
          e.style.marginBottom =3D value;=0A=
        }=0A=
        else if (name =3D=3D "margin-left") {=0A=
          e.style.marginLeft =3D value;=0A=
        }=0A=
        else if (name =3D=3D "margin-right") {=0A=
          e.style.marginRight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "margin-top") {=0A=
          e.style.marginTop =3D value;=0A=
        }=0A=
        else if (name =3D=3D "min-height") {=0A=
          e.style.minHeight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "overflow") {=0A=
          e.style.overflow =3D value;=0A=
        }=0A=
        else if (name =3D=3D "overflow-x") {=0A=
          e.style.overflowX =3D value;=0A=
        }=0A=
        else if (name =3D=3D "overflow-y") {=0A=
          e.style.overflowY =3D value;=0A=
        }=0A=
        else if (name =3D=3D "padding") {=0A=
          e.style.padding =3D value;=0A=
        }=0A=
        else if (name =3D=3D "padding-bottom") {=0A=
          e.style.paddingBottom =3D value;=0A=
        }=0A=
        else if (name =3D=3D "padding-left") {=0A=
          e.style.paddingLeft =3D value;=0A=
        }=0A=
        else if (name =3D=3D "padding-right") {=0A=
          e.style.paddingRight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "padding-top") {=0A=
          e.style.paddingTop =3D value;=0A=
        }=0A=
        else if (name =3D=3D "page-break-after") {=0A=
          e.style.pageBreakAfter =3D value;=0A=
        }=0A=
        else if (name =3D=3D "page-break-before") {=0A=
          e.style.pageBreakBefore =3D value;=0A=
        }=0A=
        else if (name =3D=3D "pixelBottom") {=0A=
          e.style.pixelBottom =3D value;=0A=
        }=0A=
        else if (name =3D=3D "pixelHeight") {=0A=
          e.style.pixelHeight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "pixelLeft") {=0A=
          e.style.pixelLeft =3D value;=0A=
        }=0A=
        else if (name =3D=3D "pixelRight") {=0A=
          e.style.pixelRight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "pixelTop") {=0A=
          e.style.pixelTop =3D value;=0A=
        }=0A=
        else if (name =3D=3D "pixelWidth") {=0A=
          e.style.pixelWidth =3D value;=0A=
        }=0A=
        else if (name =3D=3D "posBottom") {=0A=
          e.style.posBottom =3D value;=0A=
        }=0A=
        else if (name =3D=3D "posHeight") {=0A=
          e.style.posHeight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "position") {=0A=
          e.style.position =3D value;=0A=
        }=0A=
        else if (name =3D=3D "posLeft") {=0A=
          e.style.posLeft =3D value;=0A=
        }=0A=
        else if (name =3D=3D "posRight") {=0A=
          e.style.posRight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "posTop") {=0A=
          e.style.posTop =3D value;=0A=
        }=0A=
        else if (name =3D=3D "posWidth") {=0A=
          e.style.posWidth =3D value;=0A=
        }=0A=
        else if (name =3D=3D "right") {=0A=
          e.style.right =3D value;=0A=
        }=0A=
        else if (name =3D=3D "ruby-align") {=0A=
          e.style.rubyAlign =3D value;=0A=
        }=0A=
        else if (name =3D=3D "ruby-overhang") {=0A=
          e.style.rubyOverhang =3D value;=0A=
        }=0A=
        else if (name =3D=3D "ruby-position") {=0A=
          e.style.rubyPosition =3D value;=0A=
        }=0A=
        else if (name =3D=3D "scrollbar-3dlight-color") {=0A=
          e.style.scrollbar3dLightColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "scrollbar-arrow-color") {=0A=
          e.style.scrollbarArrowColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "scrollbar-base-color") {=0A=
          e.style.scrollbarBaseColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "scrollbar-darkshadow-color") {=0A=
          e.style.scrollbarDarkShadowColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "scrollbar-face-color") {=0A=
          e.style.scrollbarFaceColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "scrollbar-highlight-color") {=0A=
          e.style.scrollbarHighlightColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "scrollbar-shadow-color") {=0A=
          e.style.scrollbarShadowColor =3D value;=0A=
        }=0A=
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          e.style.textTransform =3D value;=0A=
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          e.style.textUnderlinePosition =3D value;=0A=
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          e.style.wordSpacing =3D value;=0A=
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}=0A=

------=_NextPart_000_004B_01C87610.AA478FB0
Content-Type: application/octet-stream
Content-Transfer-Encoding: quoted-printable
Content-Location: http://cancerres.aacrjournals.org/javascript/entrez/callback.js

/************************************************************************=
*****=0A=
 * javascript/entrez/callback.js=0A=
 *=0A=
 * Entrez Linking callback to populate content box.=0A=
 *=0A=
 * Copyright 2006 Board of Trustees of the Leland Stanford Junior =
University.=0A=
 =
*************************************************************************=
***/=0A=
=0A=
/*=0A=
 * Execute callback to fill content box with Entrez Linking information.=0A=
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function entrez_callback(pmid, callback_url) {=0A=
  /*=0A=
   * MSIE 5.5 and below have issues with the JavaScript=0A=
   * used for Entrez Linking. For now we have to disable=0A=
   * the callback until we can track down a proper fix=0A=
   * (or everybody sanely upgrades to version 6 or 7!).=0A=
   */=0A=
  if (navigator) {=0A=
    var appname =3D navigator.appName;=0A=
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=0A=
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   * Acquire table row element to update, initiate callback=0A=
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  var tr =3D document.getElementById('entrez_callback_'+pmid);=0A=
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}=0A=

------=_NextPart_000_004B_01C87610.AA478FB0
Content-Type: application/octet-stream
Content-Transfer-Encoding: quoted-printable
Content-Location: http://www.google-analytics.com/urchin.js

//-- Google Analytics Urchin Module=0A=
//-- Copyright 2007 Google, All Rights Reserved.=0A=
=0A=
//-- Urchin On Demand Settings ONLY=0A=
var _uacct=3D"";			// set up the Urchin Account=0A=
var _userv=3D1;			// service mode (0=3Dlocal,1=3Dremote,2=3Dboth)=0A=
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//-- UTM User Settings=0A=
var _ufsc=3D1;			// set client info flag (1=3Don|0=3Doff)=0A=
var _udn=3D"auto";		// (auto|none|domain) set the domain name for cookies=0A=
var _uhash=3D"on";		// (on|off) unique domain hash for cookies=0A=
var _utimeout=3D"1800";   	// set the inactive session timeout in seconds=0A=
var _ugifpath=3D"/__utm.gif";	// set the web path to the __utm.gif file=0A=
var _utsp=3D"|";			// transaction field separator=0A=
var _uflash=3D1;			// set flash version detect option (1=3Don|0=3Doff)=0A=
var _utitle=3D1;			// set the document title detect option =
(1=3Don|0=3Doff)=0A=
var _ulink=3D0;			// enable linker functionality (1=3Don|0=3Doff)=0A=
var _uanchor=3D0;			// enable use of anchors for campaign =
(1=3Don|0=3Doff)=0A=
var _utcp=3D"/";			// the cookie path for tracking=0A=
var _usample=3D100;		// The sampling % of visitors to track (1-100).=0A=
=0A=
//-- UTM Campaign Tracking Settings=0A=
var _uctm=3D1;			// set campaign tracking module (1=3Don|0=3Doff)=0A=
var _ucto=3D"15768000";		// set timeout in seconds (6 month default)=0A=
var _uccn=3D"utm_campaign";	// name=0A=
var _ucmd=3D"utm_medium";		// medium (cpc|cpm|link|email|organic)=0A=
var _ucsr=3D"utm_source";		// source=0A=
var _uctr=3D"utm_term";		// term/keyword=0A=
var _ucct=3D"utm_content";	// content=0A=
var _ucid=3D"utm_id";		// id number=0A=
var _ucno=3D"utm_nooverride";	// don't override=0A=
=0A=
//-- Auto/Organic Sources and Keywords=0A=
var _uOsr=3Dnew Array();=0A=
var _uOkw=3Dnew Array();=0A=
_uOsr[0]=3D"google";	_uOkw[0]=3D"q";=0A=
_uOsr[1]=3D"yahoo";	_uOkw[1]=3D"p";=0A=
_uOsr[2]=3D"msn";		_uOkw[2]=3D"q";=0A=
_uOsr[3]=3D"aol";		_uOkw[3]=3D"query";=0A=
_uOsr[4]=3D"aol";		_uOkw[4]=3D"encquery";=0A=
_uOsr[5]=3D"lycos";	_uOkw[5]=3D"query";=0A=
_uOsr[6]=3D"ask";		_uOkw[6]=3D"q";=0A=
_uOsr[7]=3D"altavista";	_uOkw[7]=3D"q";=0A=
_uOsr[8]=3D"netscape";	_uOkw[8]=3D"query";=0A=
_uOsr[9]=3D"cnn";	_uOkw[9]=3D"query";=0A=
_uOsr[10]=3D"looksmart";	_uOkw[10]=3D"qt";=0A=
_uOsr[11]=3D"about";	_uOkw[11]=3D"terms";=0A=
_uOsr[12]=3D"mamma";	_uOkw[12]=3D"query";=0A=
_uOsr[13]=3D"alltheweb";	_uOkw[13]=3D"q";=0A=
_uOsr[14]=3D"gigablast";	_uOkw[14]=3D"q";=0A=
_uOsr[15]=3D"voila";	_uOkw[15]=3D"rdata";=0A=
_uOsr[16]=3D"virgilio";	_uOkw[16]=3D"qs";=0A=
_uOsr[17]=3D"live";	_uOkw[17]=3D"q";=0A=
_uOsr[18]=3D"baidu";	_uOkw[18]=3D"wd";=0A=
_uOsr[19]=3D"alice";	_uOkw[19]=3D"qs";=0A=
_uOsr[20]=3D"yandex";	_uOkw[20]=3D"text";=0A=
_uOsr[21]=3D"najdi";	_uOkw[21]=3D"q";=0A=
_uOsr[22]=3D"aol";	_uOkw[22]=3D"q";=0A=
_uOsr[23]=3D"club-internet"; _uOkw[23]=3D"q";=0A=
_uOsr[24]=3D"mama";	_uOkw[24]=3D"query";=0A=
_uOsr[25]=3D"seznam";	_uOkw[25]=3D"q";=0A=
_uOsr[26]=3D"search";	_uOkw[26]=3D"q";=0A=
_uOsr[27]=3D"szukaj";	_uOkw[27]=3D"szukaj";=0A=
_uOsr[28]=3D"szukaj";	_uOkw[28]=3D"qt";=0A=
_uOsr[29]=3D"netsprint";	_uOkw[29]=3D"q";=0A=
_uOsr[30]=3D"google.interia";	_uOkw[30]=3D"q";=0A=
_uOsr[31]=3D"szukacz";	_uOkw[31]=3D"q";=0A=
_uOsr[32]=3D"yam";	_uOkw[32]=3D"k";=0A=
_uOsr[33]=3D"pchome";	_uOkw[33]=3D"q";=0A=
=0A=
=0A=
//-- Auto/Organic Keywords to Ignore=0A=
var _uOno=3Dnew Array();=0A=
//_uOno[0]=3D"urchin";=0A=
//_uOno[1]=3D"urchin.com";=0A=
//_uOno[2]=3D"www.urchin.com";=0A=
=0A=
//-- Referral domains to Ignore=0A=
var _uRno=3Dnew Array();=0A=
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=0A=
//-- **** Don't modify below this point ***=0A=
var =
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var _ugifpath2=3D"http://www.google-analytics.com/__utm.gif";=0A=
if (_udl.hash) _udlh=3D_udl.href.substring(_udl.href.indexOf('#'));=0A=
if (_udl.protocol=3D=3D"https:") =
_ugifpath2=3D"https://ssl.google-analytics.com/__utm.gif";=0A=
if (!_utcp || _utcp=3D=3D"") _utcp=3D"/";=0A=
function urchinTracker(page) {=0A=
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 if (_udn && _udn!=3D"") { _udo=3D" domain=3D"+_udn+";"; }=0A=
 if (_utimeout && _utimeout!=3D"") {=0A=
  x=3Dnew Date(_udt.getTime()+(_utimeout*1000));=0A=
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 if (_ulink) {=0A=
  if (_uanchor && _udlh && _udlh!=3D"") s=3D_udlh+"&";=0A=
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  if(s && s!=3D"" && s.indexOf("__utma=3D")>=3D0) {=0A=
   if (!(_uIN(a=3D_uGC(s,"__utma=3D","&")))) a=3D"-";=0A=
   if (!(_uIN(b=3D_uGC(s,"__utmb=3D","&")))) b=3D"-";=0A=
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   v=3D_uGC(s,"__utmv=3D","&");=0A=
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   k=3D_uGC(s,"__utmk=3D","&");=0A=
   xx=3D_uGC(s,"__utmx=3D","&");=0A=
   if ((k*1) !=3D ((_uHash(a+b+c+xx+z+v)*1)+(_udh*1))) =
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  _ubd.cookie=3D"__utmb=3D"+_udh+"; path=3D"+_utcp+";"+x+_udo;=0A=
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 if (_ulink && v && v!=3D"" && v!=3D"-") {=0A=
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 _ufno=3D0;=0A=
 if (!page || page=3D=3D"") _uff=3D1;=0A=
}=0A=
function _uInfo(page) {=0A=
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 if (page && page!=3D"") pg=3D_uES(page,1);=0A=
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i2.src=3D_ugifpath2+"?"+"utmwv=3D"+_uwv+s+"&utmac=3D"+_uacct+"&utmcc=3D"+=
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function _uVoid() { return; }=0A=
function _uCInfo() {=0A=
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 if (_uanchor && _udlh && _udlh!=3D"") s=3D_udlh+"&";=0A=
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 var dc=3D_ubd.cookie;=0A=
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 if (_ulink && !_ubl) {=0A=
  z=3D_uUES(_uGC(s,"__utmz=3D","&"));=0A=
  if (z!=3D"-" && z.indexOf(";")=3D=3D-1) { =
_ubd.cookie=3D"__utmz=3D"+z+"; path=3D"+_utcp+";"+x+_udo; return ""; }=0A=
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 if ((t!=3D"-" && t!=3D"") || (t2!=3D"-" && t2!=3D"") || (t3!=3D"-" && =
t3!=3D"")) {=0A=
  if (t!=3D"-" && t!=3D"") c+=3D"utmcid=3D"+_uEC(t);=0A=
  if (t2!=3D"-" && t2!=3D"") { if (c !=3D "") c+=3D"|"; =
c+=3D"utmcsr=3D"+_uEC(t2); }=0A=
  if (t3!=3D"-" && t3!=3D"") { if (c !=3D "") c+=3D"|"; =
c+=3D"utmgclid=3D"+_uEC(t3); }=0A=
  t=3D_uGC(s,_uccn+"=3D","&");=0A=
  if (t!=3D"-" && t!=3D"") c+=3D"|utmccn=3D"+_uEC(t);=0A=
  else c+=3D"|utmccn=3D(not+set)";=0A=
  t=3D_uGC(s,_ucmd+"=3D","&");=0A=
  if (t!=3D"-" && t!=3D"") c+=3D"|utmcmd=3D"+_uEC(t);=0A=
  else  c+=3D"|utmcmd=3D(not+set)";=0A=
  t=3D_uGC(s,_uctr+"=3D","&");=0A=
  if (t!=3D"-" && t!=3D"") c+=3D"|utmctr=3D"+_uEC(t);=0A=
  else { t=3D_uOrg(1); if (t!=3D"-" && t!=3D"") =
c+=3D"|utmctr=3D"+_uEC(t); }=0A=
  t=3D_uGC(s,_ucct+"=3D","&");=0A=
  if (t!=3D"-" && t!=3D"") c+=3D"|utmcct=3D"+_uEC(t);=0A=
  t=3D_uGC(s,_ucno+"=3D","&");=0A=
  if (t=3D=3D"1") o=3D1;=0A=
  if (z!=3D"-" && o=3D=3D1) return "";=0A=
 }=0A=
 if (c=3D=3D"-" || c=3D=3D"") { c=3D_uOrg(); if (z!=3D"-" && =
_ufno=3D=3D1)  return ""; }=0A=
 if (c=3D=3D"-" || c=3D=3D"") { if (_ufns=3D=3D1)  c=3D_uRef(); if =
(z!=3D"-" && _ufno=3D=3D1)  return ""; }=0A=
 if (c=3D=3D"-" || c=3D=3D"") {=0A=
  if (z=3D=3D"-" && _ufns=3D=3D1) { =
c=3D"utmccn=3D(direct)|utmcsr=3D(direct)|utmcmd=3D(none)"; }=0A=
  if (c=3D=3D"-" || c=3D=3D"") return "";=0A=
 }=0A=
 if (z!=3D"-") {=0A=
  i=3Dz.indexOf(".");=0A=
  if (i>-1) i=3Dz.indexOf(".",i+1);=0A=
  if (i>-1) i=3Dz.indexOf(".",i+1);=0A=
  if (i>-1) i=3Dz.indexOf(".",i+1);=0A=
  t=3Dz.substring(i+1,z.length);=0A=
  if (t.toLowerCase()=3D=3Dc.toLowerCase()) cs=3D1;=0A=
  t=3Dz.substring(0,i);=0A=
  if ((i=3Dt.lastIndexOf(".")) > -1) {=0A=
   t=3Dt.substring(i+1,t.length);=0A=
   cn=3D(t*1);=0A=
  }=0A=
 }=0A=
 if (cs=3D=3D0 || _ufns=3D=3D1) {=0A=
  t=3D_uGC(dc,"__utma=3D"+_udh,";");=0A=
  if ((i=3Dt.lastIndexOf(".")) > 9) {=0A=
   _uns=3Dt.substring(i+1,t.length);=0A=
   _uns=3D(_uns*1);=0A=
  }=0A=
  cn++;=0A=
  if (_uns=3D=3D0) _uns=3D1;=0A=
  _ubd.cookie=3D"__utmz=3D"+_udh+"."+_ust+"."+_uns+"."+cn+"."+c+"; =
path=3D"+_utcp+"; "+x+_udo;=0A=
 }=0A=
 if (cs=3D=3D0 || _ufns=3D=3D1) return "&utmcn=3D1";=0A=
 else return "&utmcr=3D1";=0A=
}=0A=
function _uRef() {=0A=
 if (_ur=3D=3D"0" || _ur=3D=3D"" || _ur=3D=3D"-") return "";=0A=
 var i=3D0,h,k,n;=0A=
 if ((i=3D_ur.indexOf("://"))<0) return "";=0A=
 h=3D_ur.substring(i+3,_ur.length);=0A=
 if (h.indexOf("/") > -1) {=0A=
  k=3Dh.substring(h.indexOf("/"),h.length);=0A=
  if (k.indexOf("?") > -1) k=3Dk.substring(0,k.indexOf("?"));=0A=
  h=3Dh.substring(0,h.indexOf("/"));=0A=
 }=0A=
 h=3Dh.toLowerCase();=0A=
 n=3Dh;=0A=
 if ((i=3Dn.indexOf(":")) > -1) n=3Dn.substring(0,i);=0A=
 for (var ii=3D0;ii<_uRno.length;ii++) {=0A=
  if ((i=3Dn.indexOf(_uRno[ii].toLowerCase())) > -1 && =
n.length=3D=3D(i+_uRno[ii].length)) { _ufno=3D1; break; }=0A=
 }=0A=
 if (h.indexOf("www.")=3D=3D0) h=3Dh.substring(4,h.length);=0A=
 return =
"utmccn=3D(referral)|utmcsr=3D"+_uEC(h)+"|"+"utmcct=3D"+_uEC(k)+"|utmcmd=3D=
referral";=0A=
}=0A=
function _uOrg(t) {=0A=
 if (_ur=3D=3D"0" || _ur=3D=3D"" || _ur=3D=3D"-") return "";=0A=
 var i=3D0,h,k;=0A=
 if ((i=3D_ur.indexOf("://")) < 0) return "";=0A=
 h=3D_ur.substring(i+3,_ur.length);=0A=
 if (h.indexOf("/") > -1) {=0A=
  h=3Dh.substring(0,h.indexOf("/"));=0A=
 }=0A=
 for (var ii=3D0;ii<_uOsr.length;ii++) {=0A=
  if (h.toLowerCase().indexOf(_uOsr[ii].toLowerCase()) > -1) {=0A=
   if ((i=3D_ur.indexOf("?"+_uOkw[ii]+"=3D")) > -1 || =
(i=3D_ur.indexOf("&"+_uOkw[ii]+"=3D")) > -1) {=0A=
    k=3D_ur.substring(i+_uOkw[ii].length+2,_ur.length);=0A=
    if ((i=3Dk.indexOf("&")) > -1) k=3Dk.substring(0,i);=0A=
    for (var yy=3D0;yy<_uOno.length;yy++) {=0A=
     if (_uOno[yy].toLowerCase()=3D=3Dk.toLowerCase()) { _ufno=3D1; =
break; }=0A=
    }=0A=
    if (t) return _uEC(k);=0A=
    else return =
"utmccn=3D(organic)|utmcsr=3D"+_uEC(_uOsr[ii])+"|"+"utmctr=3D"+_uEC(k)+"|=
utmcmd=3Dorganic";=0A=
   }=0A=
  }=0A=
 }=0A=
 return "";=0A=
}=0A=
function _uBInfo() {=0A=
 var sr=3D"-",sc=3D"-",ul=3D"-",fl=3D"-",cs=3D"-",je=3D1;=0A=
 var n=3Dnavigator;=0A=
 if (self.screen) {=0A=
  sr=3Dscreen.width+"x"+screen.height;=0A=
  sc=3Dscreen.colorDepth+"-bit";=0A=
 } else if (self.java) {=0A=
  var j=3Djava.awt.Toolkit.getDefaultToolkit();=0A=
  var s=3Dj.getScreenSize();=0A=
  sr=3Ds.width+"x"+s.height;=0A=
 }=0A=
 if (n.language) { ul=3Dn.language.toLowerCase(); }=0A=
 else if (n.browserLanguage) { ul=3Dn.browserLanguage.toLowerCase(); }=0A=
 je=3Dn.javaEnabled()?1:0;=0A=
 if (_uflash) fl=3D_uFlash();=0A=
 if (_ubd.characterSet) cs=3D_uES(_ubd.characterSet);=0A=
 else if (_ubd.charset) cs=3D_uES(_ubd.charset);=0A=
 return =
"&utmcs=3D"+cs+"&utmsr=3D"+sr+"&utmsc=3D"+sc+"&utmul=3D"+ul+"&utmje=3D"+j=
e+"&utmfl=3D"+fl;=0A=
}=0A=
function __utmSetTrans() {=0A=
 var e;=0A=
 if (_ubd.getElementById) e=3D_ubd.getElementById("utmtrans");=0A=
 else if (_ubd.utmform && _ubd.utmform.utmtrans) =
e=3D_ubd.utmform.utmtrans;=0A=
 if (!e) return;=0A=
 var l=3De.value.split("UTM:");=0A=
 var i,i2,c;=0A=
 if (_userv=3D=3D0 || _userv=3D=3D2) i=3Dnew Array();=0A=
 if (_userv=3D=3D1 || _userv=3D=3D2) { i2=3Dnew Array(); c=3D_uGCS(); }=0A=
=0A=
 for (var ii=3D0;ii<l.length;ii++) {=0A=
  l[ii]=3D_uTrim(l[ii]);=0A=
  if (l[ii].charAt(0)!=3D'T' && l[ii].charAt(0)!=3D'I') continue;=0A=
  var r=3DMath.round(Math.random()*2147483647);=0A=
  if (!_utsp || _utsp=3D=3D"") _utsp=3D"|";=0A=
  var f=3Dl[ii].split(_utsp),s=3D"";=0A=
  if (f[0].charAt(0)=3D=3D'T') {=0A=
   s=3D"&utmt=3Dtran"+"&utmn=3D"+r;=0A=
   f[1]=3D_uTrim(f[1]); if(f[1]&&f[1]!=3D"") =
s+=3D"&utmtid=3D"+_uES(f[1]);=0A=
   f[2]=3D_uTrim(f[2]); if(f[2]&&f[2]!=3D"") =
s+=3D"&utmtst=3D"+_uES(f[2]);=0A=
   f[3]=3D_uTrim(f[3]); if(f[3]&&f[3]!=3D"") =
s+=3D"&utmtto=3D"+_uES(f[3]);=0A=
   f[4]=3D_uTrim(f[4]); if(f[4]&&f[4]!=3D"") =
s+=3D"&utmttx=3D"+_uES(f[4]);=0A=
   f[5]=3D_uTrim(f[5]); if(f[5]&&f[5]!=3D"") =
s+=3D"&utmtsp=3D"+_uES(f[5]);=0A=
   f[6]=3D_uTrim(f[6]); if(f[6]&&f[6]!=3D"") =
s+=3D"&utmtci=3D"+_uES(f[6]);=0A=
   f[7]=3D_uTrim(f[7]); if(f[7]&&f[7]!=3D"") =
s+=3D"&utmtrg=3D"+_uES(f[7]);=0A=
   f[8]=3D_uTrim(f[8]); if(f[8]&&f[8]!=3D"") =
s+=3D"&utmtco=3D"+_uES(f[8]);=0A=
  } else {=0A=
   s=3D"&utmt=3Ditem"+"&utmn=3D"+r;=0A=
   f[1]=3D_uTrim(f[1]); if(f[1]&&f[1]!=3D"") =
s+=3D"&utmtid=3D"+_uES(f[1]);=0A=
   f[2]=3D_uTrim(f[2]); if(f[2]&&f[2]!=3D"") =
s+=3D"&utmipc=3D"+_uES(f[2]);=0A=
   f[3]=3D_uTrim(f[3]); if(f[3]&&f[3]!=3D"") =
s+=3D"&utmipn=3D"+_uES(f[3]);=0A=
   f[4]=3D_uTrim(f[4]); if(f[4]&&f[4]!=3D"") =
s+=3D"&utmiva=3D"+_uES(f[4]);=0A=
   f[5]=3D_uTrim(f[5]); if(f[5]&&f[5]!=3D"") =
s+=3D"&utmipr=3D"+_uES(f[5]);=0A=
   f[6]=3D_uTrim(f[6]); if(f[6]&&f[6]!=3D"") =
s+=3D"&utmiqt=3D"+_uES(f[6]);=0A=
  }=0A=
  if ((_userv=3D=3D0 || _userv=3D=3D2) && _uSP()) {=0A=
   i[ii]=3Dnew Image(1,1);=0A=
   i[ii].src=3D_ugifpath+"?"+"utmwv=3D"+_uwv+s;=0A=
   i[ii].onload=3Dfunction() { _uVoid(); }=0A=
  }=0A=
  if ((_userv=3D=3D1 || _userv=3D=3D2) && _uSP()) {=0A=
   i2[ii]=3Dnew Image(1,1);=0A=
   =
i2[ii].src=3D_ugifpath2+"?"+"utmwv=3D"+_uwv+s+"&utmac=3D"+_uacct+"&utmcc=3D=
"+c;=0A=
   i2[ii].onload=3Dfunction() { _uVoid(); }=0A=
  }=0A=
 }=0A=
 return;=0A=
}=0A=
function _uFlash() {=0A=
 var f=3D"-",n=3Dnavigator;=0A=
 if (n.plugins && n.plugins.length) {=0A=
  for (var ii=3D0;ii<n.plugins.length;ii++) {=0A=
   if (n.plugins[ii].name.indexOf('Shockwave Flash')!=3D-1) {=0A=
    f=3Dn.plugins[ii].description.split('Shockwave Flash ')[1];=0A=
    break;=0A=
   }=0A=
  }=0A=
 } else if (window.ActiveXObject) {=0A=
  for (var ii=3D10;ii>=3D2;ii--) {=0A=
   try {=0A=
    var fl=3Deval("new =
ActiveXObject('ShockwaveFlash.ShockwaveFlash."+ii+"');");=0A=
    if (fl) { f=3Dii + '.0'; break; }=0A=
   }=0A=
   catch(e) {}=0A=
  }=0A=
 }=0A=
 return f;=0A=
}=0A=
function __utmLinker(l,h) {=0A=
 if (!_ulink) return;=0A=
 var p,k,a=3D"-",b=3D"-",c=3D"-",x=3D"-",z=3D"-",v=3D"-";=0A=
 var dc=3D_ubd.cookie;=0A=
 if (!l || l=3D=3D"") return;=0A=
 var iq =3D l.indexOf("?"); =0A=
 var ih =3D l.indexOf("#"); =0A=
 if (dc) {=0A=
  a=3D_uES(_uGC(dc,"__utma=3D"+_udh,";"));=0A=
  b=3D_uES(_uGC(dc,"__utmb=3D"+_udh,";"));=0A=
  c=3D_uES(_uGC(dc,"__utmc=3D"+_udh,";"));=0A=
  x=3D_uES(_uGC(dc,"__utmx=3D"+_udh,";"));=0A=
  z=3D_uES(_uGC(dc,"__utmz=3D"+_udh,";"));=0A=
  v=3D_uES(_uGC(dc,"__utmv=3D"+_udh,";"));=0A=
  k=3D(_uHash(a+b+c+x+z+v)*1)+(_udh*1);=0A=
  =
p=3D"__utma=3D"+a+"&__utmb=3D"+b+"&__utmc=3D"+c+"&__utmx=3D"+x+"&__utmz=3D=
"+z+"&__utmv=3D"+v+"&__utmk=3D"+k;=0A=
 }=0A=
 if (p) {=0A=
  if (h && ih>-1) return;=0A=
  if (h) { _udl.href=3Dl+"#"+p; }=0A=
  else {=0A=
   if (iq=3D=3D-1 && ih=3D=3D-1) _udl.href=3Dl+"?"+p;=0A=
   else if (ih=3D=3D-1) _udl.href=3Dl+"&"+p;=0A=
   else if (iq=3D=3D-1) =
_udl.href=3Dl.substring(0,ih-1)+"?"+p+l.substring(ih);=0A=
   else _udl.href=3Dl.substring(0,ih-1)+"&"+p+l.substring(ih);=0A=
  }=0A=
 } else { _udl.href=3Dl; }=0A=
}=0A=
function __utmLinkPost(f,h) {=0A=
 if (!_ulink) return;=0A=
 var p,k,a=3D"-",b=3D"-",c=3D"-",x=3D"-",z=3D"-",v=3D"-";=0A=
 var dc=3D_ubd.cookie;=0A=
 if (!f || !f.action) return;=0A=
 var iq =3D f.action.indexOf("?"); =0A=
 var ih =3D f.action.indexOf("#"); =0A=
 if (dc) {=0A=
  a=3D_uES(_uGC(dc,"__utma=3D"+_udh,";"));=0A=
  b=3D_uES(_uGC(dc,"__utmb=3D"+_udh,";"));=0A=
  c=3D_uES(_uGC(dc,"__utmc=3D"+_udh,";"));=0A=
  x=3D_uES(_uGC(dc,"__utmx=3D"+_udh,";"));=0A=
  z=3D_uES(_uGC(dc,"__utmz=3D"+_udh,";"));=0A=
  v=3D_uES(_uGC(dc,"__utmv=3D"+_udh,";"));=0A=
  k=3D(_uHash(a+b+c+x+z+v)*1)+(_udh*1);=0A=
  =
p=3D"__utma=3D"+a+"&__utmb=3D"+b+"&__utmc=3D"+c+"&__utmx=3D"+x+"&__utmz=3D=
"+z+"&__utmv=3D"+v+"&__utmk=3D"+k;=0A=
 }=0A=
 if (p) {=0A=
  if (h && ih>-1) return;=0A=
  if (h) { f.action+=3D"#"+p; }=0A=
  else {=0A=
   if (iq=3D=3D-1 && ih=3D=3D-1) f.action+=3D"?"+p;=0A=
   else if (ih=3D=3D-1) f.action+=3D"&"+p;=0A=
   else if (iq=3D=3D-1) =
f.action=3Df.action.substring(0,ih-1)+"?"+p+f.action.substring(ih);=0A=
   else =
f.action=3Df.action.substring(0,ih-1)+"&"+p+f.action.substring(ih);=0A=
  }=0A=
 }=0A=
 return;=0A=
}=0A=
function __utmSetVar(v) {=0A=
 if (!v || v=3D=3D"") return;=0A=
 if (!_udo || _udo =3D=3D "") {=0A=
  _udh=3D_uDomain();=0A=
  if (_udn && _udn!=3D"") { _udo=3D" domain=3D"+_udn+";"; }=0A=
 }=0A=
 if (!_uVG()) return;=0A=
 var r=3DMath.round(Math.random() * 2147483647);=0A=
 _ubd.cookie=3D"__utmv=3D"+_udh+"."+_uES(v)+"; path=3D"+_utcp+"; =
expires=3D"+_uNx()+";"+_udo;=0A=
 var s=3D"&utmt=3Dvar&utmn=3D"+r;=0A=
 if ((_userv=3D=3D0 || _userv=3D=3D2) && _uSP()) {=0A=
  var i=3Dnew Image(1,1);=0A=
  i.src=3D_ugifpath+"?"+"utmwv=3D"+_uwv+s;=0A=
  i.onload=3Dfunction() { _uVoid(); }=0A=
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 if ((_userv=3D=3D1 || _userv=3D=3D2) && _uSP()) {=0A=
  var i2=3Dnew Image(1,1);=0A=
  =
i2.src=3D_ugifpath2+"?"+"utmwv=3D"+_uwv+s+"&utmac=3D"+_uacct+"&utmcc=3D"+=
_uGCS();=0A=
  i2.onload=3Dfunction() { _uVoid(); }=0A=
 }=0A=
}=0A=
function _uGCS() {=0A=
 var t,c=3D"",dc=3D_ubd.cookie;=0A=
 if ((t=3D_uGC(dc,"__utma=3D"+_udh,";"))!=3D"-") =
c+=3D_uES("__utma=3D"+t+";+");=0A=
 if ((t=3D_uGC(dc,"__utmb=3D"+_udh,";"))!=3D"-") =
c+=3D_uES("__utmb=3D"+t+";+");=0A=
 if ((t=3D_uGC(dc,"__utmc=3D"+_udh,";"))!=3D"-") =
c+=3D_uES("__utmc=3D"+t+";+");=0A=
 if ((t=3D_uGC(dc,"__utmx=3D"+_udh,";"))!=3D"-") =
c+=3D_uES("__utmx=3D"+t+";+");=0A=
 if ((t=3D_uGC(dc,"__utmz=3D"+_udh,";"))!=3D"-") =
c+=3D_uES("__utmz=3D"+t+";+");=0A=
 if ((t=3D_uGC(dc,"__utmv=3D"+_udh,";"))!=3D"-") =
c+=3D_uES("__utmv=3D"+t+";");=0A=
 if (c.charAt(c.length-1)=3D=3D"+") c=3Dc.substring(0,c.length-1);=0A=
 return c;=0A=
}=0A=
function _uGC(l,n,s) {=0A=
 if (!l || l=3D=3D"" || !n || n=3D=3D"" || !s || s=3D=3D"") return "-";=0A=
 var i,i2,i3,c=3D"-";=0A=
 i=3Dl.indexOf(n);=0A=
 i3=3Dn.indexOf("=3D")+1;=0A=
 if (i > -1) {=0A=
  i2=3Dl.indexOf(s,i); if (i2 < 0) { i2=3Dl.length; }=0A=
  c=3Dl.substring((i+i3),i2);=0A=
 }=0A=
 return c;=0A=
}=0A=
function _uDomain() {=0A=
 if (!_udn || _udn=3D=3D"" || _udn=3D=3D"none") { _udn=3D""; return 1; }=0A=
 if (_udn=3D=3D"auto") {=0A=
  var d=3D_ubd.domain;=0A=
  if (d.substring(0,4)=3D=3D"www.") {=0A=
   d=3Dd.substring(4,d.length);=0A=
  }=0A=
  _udn=3Dd;=0A=
 }=0A=
 _udn =3D _udn.toLowerCase(); =0A=
 if (_uhash=3D=3D"off") return 1;=0A=
 return _uHash(_udn);=0A=
}=0A=
function _uHash(d) {=0A=
 if (!d || d=3D=3D"") return 1;=0A=
 var h=3D0,g=3D0;=0A=
 for (var i=3Dd.length-1;i>=3D0;i--) {=0A=
  var c=3DparseInt(d.charCodeAt(i));=0A=
  h=3D((h << 6) & 0xfffffff) + c + (c << 14);=0A=
  if ((g=3Dh & 0xfe00000)!=3D0) h=3D(h ^ (g >> 21));=0A=
 }=0A=
 return h;=0A=
}=0A=
function _uFixA(c,s,t) {=0A=
 if (!c || c=3D=3D"" || !s || s=3D=3D"" || !t || t=3D=3D"") return "-";=0A=
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 var lt=3D0,i=3D0;=0A=
 if ((i=3Da.lastIndexOf(".")) > 9) {=0A=
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  _uns=3D(_uns*1)+1;=0A=
  a=3Da.substring(0,i);=0A=
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   lt=3Da.substring(i+1,a.length);=0A=
   a=3Da.substring(0,i);=0A=
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  if ((i=3Da.lastIndexOf(".")) > 5) {=0A=
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}=0A=
function _uTrim(s) {=0A=
  if (!s || s=3D=3D"") return "";=0A=
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(s.charAt(0,1)=3D=3D'\r')) s=3Ds.substring(1,s.length);=0A=
  while ((s.charAt(s.length-1)=3D=3D' ') || =
(s.charAt(s.length-1)=3D=3D'\n') || (s.charAt(s.length-1)=3D=3D'\r')) =
s=3Ds.substring(0,s.length-1);=0A=
  return s;=0A=
}=0A=
function _uEC(s) {=0A=
  var n=3D"";=0A=
  if (!s || s=3D=3D"") return "";=0A=
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else n+=3Ds.charAt(i);}=0A=
  return n;=0A=
}=0A=
function __utmVisitorCode(f) {=0A=
 var r=3D0,t=3D0,i=3D0,i2=3D0,m=3D31;=0A=
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 if ((i=3Da.indexOf(".",0))<0) return;=0A=
 if ((i2=3Da.indexOf(".",i+1))>0) r=3Da.substring(i+1,i2); else return =
"";  =0A=
 if ((i=3Da.indexOf(".",i2+1))>0) t=3Da.substring(i2+1,i); else return =
"";  =0A=
 if (f) {=0A=
  return r;=0A=
 } else {=0A=
  var c=3Dnew =
Array('A','B','C','D','E','F','G','H','J','K','L','M','N','P','R','S','T'=
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  return =
c[r>>28&m]+c[r>>23&m]+c[r>>18&m]+c[r>>13&m]+"-"+c[r>>8&m]+c[r>>3&m]+c[((r=
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&m]+c[t&m];=0A=
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}=0A=
function _uIN(n) {=0A=
 if (!n) return false;=0A=
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  var c=3Dn.charAt(i);=0A=
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 return true;=0A=
}=0A=
function _uES(s,u) {=0A=
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}=0A=
function _uUES(s) {=0A=
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}=0A=
function _uVG() {=0A=
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=3D=3D 0 || _udn.indexOf("google.") =3D=3D 0) && _utcp=3D=3D'/' && =
_udn.indexOf("google.org")=3D=3D-1) {=0A=
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 return true;=0A=
}=0A=
function _uSP() {=0A=
 var s=3D100;=0A=
 if (_usample) s=3D_usample;=0A=
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}=0A=
function urchinPathCopy(p){=0A=
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 for (i=3D0;i<6;i++){=0A=
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t+=3Dsx; else t+=3Dnx;=0A=
  c=3D_uGC(d.cookie,"__utm"+cs[i]+"=3D"+h,";");=0A=
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}=0A=
function _uCO() {=0A=
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 var sc=3Ddocument.createElement('script');=0A=
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sc.src=3D'https://'+d+'/analytics/reporting/overlay_js?gaso=3D'+_utk+'&'+=
Math.random();=0A=
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}=0A=
function _uGT() {=0A=
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}=0A=
var _utk=3D_uGT();=0A=
if (_utk && _utk!=3D"" && _utk.length>10) {=0A=
 if (window.addEventListener) {=0A=
  window.addEventListener('load', _uCO, false); =0A=
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}=0A=
=0A=
function _uNx() {=0A=
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}=0A=

------=_NextPart_000_004B_01C87610.AA478FB0--

