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Subject: Identification of a Cancer Stem Cell in Human Brain Tumors -- Singh et al. 63 (18): 5821 -- Cancer Research
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          <TD class=3Dcontent_box_title colSpan=3D2>PubMed</TD></TR>
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        =
</TD></TR></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE><FONT=20
size=3D-1>[<EM>Cancer Research</EM> 63, 5821-5828, September 15, =
2003]<BR>=A9 2003=20
<A href=3D"http://cancerres.aacrjournals.org/misc/terms.shtml">American=20
Association for Cancer Research</A> </FONT><BR>
<TABLE cellSpacing=3D0 cellPadding=3D0>
  <TBODY>
  <TR>
    <TD>
      <HR noShade SIZE=3D1>

      <H3>Regular Articles</H3></TD></TR></TBODY></TABLE>
<H2>Identification of a Cancer Stem Cell in Human Brain Tumors=20
</H2><STRONG></NOBR><NOBR>Sheila K. Singh</NOBR>, <NOBR>Ian D. =
Clarke</NOBR>,=20
<NOBR>Mizuhiko Terasaki</NOBR>, <NOBR>Victoria E. Bonn</NOBR>, =
<NOBR>Cynthia=20
Hawkins</NOBR>, <NOBR>Jeremy Squire</NOBR> and <NOBR>Peter B. =
Dirks</NOBR>=20
</STRONG>
<P><FONT size=3D-1>The Arthur and Sonia Labatt Brain Tumour Research =
Centre, The=20
Hospital for Sick Children, Toronto, Ontario M5G 1X8, Canada [S. K. S., =
I. D.=20
C., M. T., V. E. B., P. B. D.], and Program in Developmental Biology [S. =
K. S.,=20
I. D. C., M. T., V. E. B., P. B. D.], Division of Neurosurgery [S. K. =
S., P. B.=20
D.], Department of Pediatric Laboratory Medicine [C. H.], and Department =
of=20
Laboratory Medicine and Pathobiology [J. S.], University of Toronto, =
Toronto,=20
Ontario M5G 1X8 Canada </FONT>
<P><A name=3DABS><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
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/63/18/5821#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/63/18/5821#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/63/18/5821#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/63/18/5821#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/63/18/5821#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/63/18/5821#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>M=
ost=20
current research on human brain tumors is focused on the<SUP> =
</SUP>molecular=20
and cellular analysis of the bulk tumor mass. However,<SUP> </SUP>there =
is=20
overwhelming evidence in some malignancies that the<SUP> </SUP>tumor =
clone is=20
heterogeneous with respect to proliferation and<SUP> =
</SUP>differentiation. In=20
human leukemia, the tumor clone is organized<SUP> </SUP>as a hierarchy =
that=20
originates from rare leukemic stem cells<SUP> </SUP>that possess =
extensive=20
proliferative and self-renewal potential,<SUP> </SUP>and are responsible =
for=20
maintaining the tumor clone. We report<SUP> </SUP>here the =
identification and=20
purification of a cancer stem cell<SUP> </SUP>from human brain tumors of =

different phenotypes that possesses<SUP> </SUP>a marked capacity for=20
proliferation, self-renewal, and differentiation.<SUP> </SUP>The =
increased=20
self-renewal capacity of the brain tumor stem<SUP> </SUP>cell (BTSC) was =
highest=20
from the most aggressive clinical samples<SUP> </SUP>of medulloblastoma =
compared=20
with low-grade gliomas. The BTSC<SUP> </SUP>was exclusively isolated =
with the=20
cell fraction expressing the<SUP> </SUP>neural stem cell surface marker =
CD133.=20
These CD133+ cells could<SUP> </SUP>differentiate in culture into tumor =
cells=20
that phenotypically<SUP> </SUP>resembled the tumor from the patient. The =

identification of<SUP> </SUP>a BTSC provides a powerful tool to =
investigate the=20
tumorigenic<SUP> </SUP>process in the central nervous system and to =
develop=20
therapies<SUP> </SUP>targeted to the BTSC.<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/63/18/5821#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/63/18/5821#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/63/18/5821#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/63/18/5821#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/63/18/5821#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/63/18/5821#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=
rain=20
tumors are the leading cause of cancer mortality in children<SUP> =
</SUP>and=20
remain difficult to cure despite advances in surgery and<SUP> =
</SUP>adjuvant=20
therapy. Most current brain tumor research is focused<SUP> </SUP>on the=20
molecular and cellular analysis of the bulk tumor mass.<SUP> </SUP>Brain =
tumors=20
are typically comprised of morphologically diverse<SUP> </SUP>cells that =
express=20
a variety of neural lineage markers. Study<SUP> </SUP>of the basic =
morphology=20
and phenotype of brain tumors has only<SUP> </SUP>yielded a limited =
amount of=20
knowledge of the clinical behavior<SUP> </SUP>of the tumor, as brain =
tumors that=20
share similar morphology<SUP> </SUP>and phenotype can have a very =
different=20
prognosis and response<SUP> </SUP>to treatment. We lack a functional =
assay of=20
the brain tumor<SUP> </SUP>cells that could determine which of the=20
morphologically diverse<SUP> </SUP>tumor cells are capable of =
maintaining the=20
growth of the tumor.<SUP> </SUP>Determination of key cells in the tumor=20
population that are<SUP> </SUP>able to maintain the tumor will give =
insight into=20
the mechanism<SUP> </SUP>of brain tumorigenesis and will allow us to =
trace back=20
to the<SUP> </SUP>cell of origin in the normal brain.<SUP> </SUP>
<P>There is overwhelming evidence in other malignancies, such as<SUP>=20
</SUP>leukemia, that the clonal population of neoplastic cells =
exhibits<SUP>=20
</SUP>marked heterogeneity with respect to proliferation and=20
differentiation<SUP> </SUP><A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B1"=
>(1</A>=20
<A =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B2"=
>,=20
2)</A> . Rare stem cells within the leukemic population possess<SUP>=20
</SUP>extensive proliferation and self-renewal capacity that is not<SUP> =

</SUP>found in the majority of the leukemic cells. The ability to<SUP>=20
</SUP>fractionate and functionally analyze leukemic stem cells led<SUP> =
</SUP>to=20
the determination that they are necessary and sufficient<SUP> </SUP>to =
maintain=20
the leukemia <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B1"=
>(1</A>=20
<A =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B3"=
>,=20
3)</A> .<SUP> </SUP>
<P>We have applied the techniques used to isolate normal neural<SUP> =
</SUP>stem=20
cells in culture (as clonally derived neurospheres, each<SUP> </SUP>of =
which=20
arise from a single stem cell; Ref. <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B4"=
>4</A> )=20
to the analysis<SUP> </SUP>of human pediatric brain tumors. We used =
assays of=20
neurosphere<SUP> </SUP>cells to functionally characterize the tumor cell =

populations.<SUP> </SUP>We report the identification and purification of =
a cell=20
from<SUP> </SUP>primary human brain tumors of different phenotypes that =
has<SUP>=20
</SUP>marked capacity for proliferation, self-renewal, and =
differentiation.<SUP>=20
</SUP>This cell represented a minority of the tumor cell population<SUP> =

</SUP>and was identified by expression of the cell surface marker<SUP>=20
</SUP>CD133. This CD133+ cell, which we have termed the BTSC,<A=20
name=3DRFN3></A><SUP><A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#FN3=
">3</A></SUP>=20
lacked<SUP> </SUP>the expression of neural differentiation markers, and =
was=20
necessary<SUP> </SUP>for the proliferation and self-renewal of the tumor =
in=20
culture.<SUP> </SUP>This cell was also capable of differentiating <I>in=20
vitro</I> into<SUP> </SUP>cell phenotypes identical to the tumor <I>in =
situ</I>.=20
The marker phenotype<SUP> </SUP>of the BTSC was similar to that of =
normal neural=20
stem cells,<SUP> </SUP>in that it expressed CD133 and nestin, and was =
the same=20
in patients<SUP> </SUP>with the same pathological type of tumor and in =
patients=20
with<SUP> </SUP>different pathological subtypes. This suggests that =
brain=20
tumors<SUP> </SUP>can be generated from BTSCs that share a very similar=20
phenotype.<SUP> </SUP>A better understanding of brain tumor biology will =
come=20
from<SUP> </SUP>additional cellular and molecular studies of the BTSC.=20
Comparison<SUP> </SUP>of normal neural stem cells and BTSCs will aid in =
finding=20
the<SUP> </SUP>normal brain cell that originates the tumor.<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/63/18/5821#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/63/18/5821#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/63/18/5821#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/63/18/5821#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/63/18/5821#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/63/18/5821#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><=
STRONG>Primary=20
Tumor Sphere Culture.</STRONG><BR>Tumor samples were obtained from =
consenting=20
patients, as approved<SUP> </SUP>by the Research Ethics Board at The =
Hospital=20
for Sick Children.<SUP> </SUP>Tumors were washed, acutely dissociated in =

oxygenated artificial<SUP> </SUP>cerebrospinal fluid and subject to =
enzymatic=20
dissociation as<SUP> </SUP>described previously <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B4"=
>(4)</A>=20
. Tumor cells were then resuspended<SUP> </SUP>in TSM consisting of a =
chemically=20
defined serum-free neural<SUP> </SUP>stem cell medium <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B4"=
>(4)</A>=20
, human recombinant EGF (20 ng/ml; Sigma),<SUP> </SUP>bFGF (20 ng/ml; =
Upstate),=20
leukemia inhibitory factor (10 ng/ml;<SUP> </SUP>Chemicon), Neuronal =
Survival=20
Factor (NSF) (1x; Clonetics), and<SUP> </SUP><I>N</I>-acetylcysteine (60 =
=B5g/ml;=20
Sigma; Ref. <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B5"=
>5</A> ),=20
and plated<SUP> </SUP>at a density of 3 <FONT =
face=3Darial,helvetica>x</FONT>=20
10<SUP>6</SUP> live cells/60-mm plate. RBCs were removed<SUP> =
</SUP>using=20
lympholyte-M (Cedarlane).<SUP> </SUP>
<P><STRONG>Limiting Dilution Assay and Primary Sphere Formation=20
Assay.</STRONG><BR>Limiting dilution assay was performed as described=20
previously<SUP> </SUP><A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B6"=
>(6</A>=20
<A =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B7"=
>,=20
7)</A> . After primary sphere formation was noted, sphere cells<SUP> =
</SUP>were=20
dissociated and plated in 96-well microwell plates in 0.2<SUP> </SUP>ml =
volumes=20
of TSM. Final cell dilutions ranged from 200 cells/well<SUP> </SUP>to 1=20
cell/well in 0.2-ml volumes. Cultures were fed 0.025 ml<SUP> </SUP>of =
TSM every=20
2 days until day 7, when the percentage of wells<SUP> </SUP>not =
containing=20
spheres for each cell plating density was calculated<SUP> </SUP>and =
plotted=20
against the number of cells per well. Regression<SUP> </SUP>lines were =
plotted=20
and x-intercept values calculated, which<SUP> </SUP>represent the number =
of=20
cells required to form at least 1 tumor<SUP> </SUP>sphere in every well. =

CD133-adherent tumor cells were trypsinized<SUP> </SUP>before collection =
for=20
assays. For primary sphere formation assays,<SUP> </SUP>this analysis =
was=20
performed on the entire acutely dissociated<SUP> </SUP>tumor cell =
population on=20
day 0 to quantify stem cell frequency<SUP> </SUP>within the tumor.<SUP> =
</SUP>
<P><STRONG>Cell Proliferation Assays.</STRONG><BR>Cells were plated in =
96-well=20
microwell plates in 0.1-ml volumes<SUP> </SUP>of SFM supplemented with =
growth=20
factors, at a density of 1000<SUP> </SUP>cells/well. Cell proliferation =
assays=20
were performed on days<SUP> </SUP>0, 3 5, and 7 postplating using the =
Roche=20
3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium<SUP> =
</SUP>bromide-based=20
Colorimetric Assay Cell Proliferation kit 1. Quantification<SUP> =
</SUP>of viable=20
cells through reading of UV absorption spectrums at<SUP> </SUP>575 nm =
was=20
performed on a Versamax microplate reader.<SUP> </SUP>
<P><STRONG>Differentiation Assay of Tumor Spheres.</STRONG><BR>Two days =
after=20
primary culture, cells were plated onto glass<SUP> </SUP>coverslips =
coated in=20
poly-<FONT size=3D-2>L</FONT>-ornithine (Sigma; Ref. <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B4"=
>4</A> )=20
in medium<SUP> </SUP>with 10% FBS in individual wells of a 24-well =
culture=20
plate.<SUP> </SUP>Cells were fed with FBS-supplemented medium every 2 =
days,=20
and<SUP> </SUP>coverslips were processed 7 days after plating using=20
immunocytochemistry.<SUP> </SUP>
<P><STRONG>Immunocytochemical Staining of Tumor Stem=20
Cells.</STRONG><BR>Immunocytochemistry was performed as described =
previously <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B7"=
>(7)</A>=20
.<SUP> </SUP>Briefly, for immunostaining of undifferentiated tumor =
spheres,<SUP>=20
</SUP>cells were plated onto poly-<FONT size=3D-2>L</FONT>-ornithine =
coated glass=20
coverslips<SUP> </SUP>in SFM containing 10% FBS, for 4 h. Cells were =
then fixed=20
with<SUP> </SUP>4% paraformaldehyde and stained with antibodies against=20
CD133/1<SUP> </SUP>(mouse monoclonal IgG1; Miltenyi Biotec), nestin =
(rabbit=20
polyclonal;<SUP> </SUP>Chemicon), =DF-tubulin 3 (mouse monoclonal IgG1;=20
Chemicon),<SUP> </SUP>GFAP (rabbit polyclonal; DAKO), mitogen-activated =
protein=20
2<SUP> </SUP>(mouse monoclonal IgG1; Chemicon), and PDGFR <IMG =
alt=3D{alpha}=20
src=3D"http://cancerres.aacrjournals.org/math/agr.gif" border=3D0> =
(rabbit=20
polyclonal<SUP> </SUP>C20; Santa Cruz Biotechnology). Appropriate =
secondary=20
antibodies<SUP> </SUP>(Texas Red donkey antirabbit; Jackson =
Immunoresearch; and=20
Alexa<SUP> </SUP>488 goat antimouse; Molecular Probes) were used.<SUP> =
</SUP>
<P>For immunostaining of differentiated tumor cells, =
differentiation<SUP>=20
</SUP>assays were performed 2 days after primary tumor culture; 7<SUP>=20
</SUP>days after differentiation, immunocytochemistry was performed<SUP> =

</SUP>as described above. Cells were additionally immunostained =
with<SUP>=20
</SUP>4',6-diamidino-2-phenylindole (Sigma), to permit counting of<SUP>=20
</SUP>cell nuclei in at least 5 microscopic fields per specimen.=20
Quantification<SUP> </SUP>of cells stained with each antibody could then =
be=20
averaged and<SUP> </SUP>estimated as a percentage of total nuclei =
counted.<SUP>=20
</SUP>
<P><STRONG>Magnetic Cell Sorting and Flow Cytometry.</STRONG><BR>Within =
3 days=20
of primary culture, cells were centrifuged at<SUP> </SUP>800 <FONT=20
face=3Darial,helvetica>x</FONT> <I>g</I> for 5 min, triturated with a=20
fire-narrowed Pasteur pipette,<SUP> </SUP>and resuspended in 1<FONT=20
face=3Darial,helvetica>x</FONT> PBS with 0.5% BSA and 2 m<FONT =
size=3D-2>M</FONT>=20
EDTA. Magnetic<SUP> </SUP>labeling with 1 =B5l CD133/1 Microbeads/1 =
million=20
cells<SUP> </SUP>was performed using the Miltenyi Biotec CD133 Cell=20
Isolation<SUP> </SUP>kit. Ten =B5l of CD133=962-phycoerythrin=20
(fluorochrome-conjugated<SUP> </SUP>mouse monoclonal IgG1; Miltenyi =
Biotec) was=20
added for an additional<SUP> </SUP>30 min to evaluate the efficiency of =
magnetic=20
separation by<SUP> </SUP>flow cytometry. Magnetic separation was carried =
out on=20
the autoMACS<SUP> </SUP>machine (Miltenyi Biotec). Positive and negative =

fractions were<SUP> </SUP>eluted with a double-sensitive mode. Aliquots =
of=20
CD133+ and<SUP> </SUP>CD133- sorted cells were evaluated for purity by =
flow=20
cytometry<SUP> </SUP>with a FACSCalibur machine (BD Biosciences). CD133+ =
and=20
CD133-<SUP> </SUP>sorted cell populations were resuspended in SFM with=20
growth<SUP> </SUP>hormones.<SUP> </SUP>
<P><STRONG>Spectral Karyotype Analysis of Tumor Sphere =
Cells.</STRONG><BR>Tumor=20
spheres were gently aspirated to disaggregate and cultured<SUP> </SUP>in =
TSM as=20
described above. The cultures were harvested within<SUP> </SUP>3=965 =
days with 0.1=20
=B5g/ml Colcemid (Life Technologies,<SUP> </SUP>Inc.) for 2=963 h, KCl =
(0.075 <FONT=20
size=3D-2>M</FONT>) -treated, and fixed in<SUP> </SUP>3:1 methanol: =
acetic acid.=20
SKY was performed on tumor metaphase<SUP> </SUP>cells according to the=20
manufacturer=92s instructions (ASI,<SUP> </SUP>Carlsbad, CA) and as =
published=20
previously <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B8"=
>(8)</A>=20
. Spectral images<SUP> </SUP>were acquired and analyzed with an SD 200 =
Spectral=20
Bio-imaging<SUP> </SUP>System (ASI Ltd., MigdalHaemek, Israel) attached =
to a=20
Zeiss<SUP> </SUP>Axioplan 2 microscope (Carl Zeiss, Toronto, Ontario,=20
Canada),<SUP> </SUP>and analyzed using SKYVIEW (ver. 1.2; ASI) =
software.<SUP>=20
</SUP>
<P><STRONG>Immunohistochemistry on Tumor =
Sections.</STRONG><BR>Formalin-fixed,=20
paraffin-embedded tissue sections were mounted<SUP> </SUP>on positive =
charged=20
microscope slides. Tissue sections were<SUP> </SUP>then baked overnight =
at 60=B0C,=20
and treated with epitope retrieval<SUP> </SUP>techniques and blocked for =

endogenous peroxidase and biotin<SUP> </SUP>before the application of =
the=20
primary antibody. Incubation of<SUP> </SUP>antihuman CD133 at a 1:10 =
dilution=20
was performed overnight at<SUP> </SUP>room temperature. Subsequent=20
immunodetection was performed using<SUP> </SUP>the Elite Vector Stain =
ABC System=20
(Vector Laboratories, Burlingham,<SUP> </SUP>CA). Color visualization =
was=20
performed using 3-3'-diaminobenzidine<SUP> </SUP>as the chromagen =
substrate=20
(Sigma Chemical Company, St. Louis,<SUP> </SUP>MO).<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/63/18/5821#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/63/18/5821#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/63/18/5821#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/63/18/5821#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/63/18/5821#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/63/18/5821#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><=
STRONG>Primary=20
Brain Tumors of Different Phenotypes Form Neurosphere-like=20
Colonies.</STRONG><BR>One key determinant of stem cells is the capacity =
for=20
extensive<SUP> </SUP>proliferation. To determine whether cells with =
distinct=20
proliferative<SUP> </SUP>abilities were present in human brain tumors, =
we=20
established<SUP> </SUP>cultures from 14 solid primary pediatric brain =
tumors=20
(Table<SUP> </SUP>1)<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#T1"=
><IMG=20
height=3D7 alt=3DCitation=20
src=3D"http://cancerres.aacrjournals.org/icons/ref-arrow.gif" width=3D8=20
border=3D1></A> , which were acutely dissociated into individual cells. =
We<SUP>=20
</SUP>used culture conditions that favored stem cell growth, =
established<SUP>=20
</SUP>previously for isolation of neural stem cells as neurospheres<SUP> =

</SUP><A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B4"=
>(4)</A>=20
. SFM allows for the maintenance of an undifferentiated<SUP> </SUP>stem =
cell=20
state, and the addition of bFGF and EGF induced the<SUP> =
</SUP>proliferation of=20
multipotent, self-renewing, and expandable<SUP> </SUP>neural stem cells =
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B9"=
>(9</A>=20
<A =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B10=
">,=20
10)</A> . Regardless of pathological subtype,<SUP> </SUP>within 24=9648 =
h of=20
primary culture all of the brain tumors<SUP> </SUP>yielded a minority =
fraction=20
of cells that demonstrated growth<SUP> </SUP>into clonally derived=20
neurosphere-like clusters, termed tumor<SUP> </SUP>spheres (Fig. 1)<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#F1"=
><IMG=20
height=3D7 alt=3DCitation=20
src=3D"http://cancerres.aacrjournals.org/icons/ref-arrow.gif" width=3D8=20
border=3D1></A> . The frequency of the stem cell population<SUP> =
</SUP>within the=20
tumor was determined by primary sphere formation<SUP> </SUP>assays =
performed on=20
6 tumors, yielding a stem cell frequency<SUP> </SUP>ranging from 0.3% to =
25.1%=20
(Table 2)<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#T2"=
><IMG=20
height=3D7 alt=3DCitation=20
src=3D"http://cancerres.aacrjournals.org/icons/ref-arrow.gif" width=3D8=20
border=3D1></A> . The remaining majority<SUP> </SUP>of tumor cells =
exhibited=20
adherence, loss of proliferation, and<SUP> </SUP>subsequent =
differentiation,=20
whereas tumor spheres remained nonadherent,<SUP> </SUP>continuing to =
proliferate=20
and expand the tumor cell culture<SUP> </SUP>over time. Tumor spheres =
generated=20
from all 14 of the specimens<SUP> </SUP>showed immunoreactivity for =
nestin (an=20
intermediate filament<SUP> </SUP>protein found in undifferentiated =
central=20
nervous system cells<SUP> </SUP>and a characteristic neural stem cell =
marker;=20
Ref. <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B11=
">11</A>=20
) and<SUP> </SUP>for CD133, a novel putative neural stem cell marker =
(Refs. <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B5"=
>5</A> <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B12=
">,=20
12</A><SUP> </SUP>; Fig. 1, <I>E=96L</I><A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#F1"=
><IMG=20
height=3D7 alt=3DCitation=20
src=3D"http://cancerres.aacrjournals.org/icons/ref-arrow.gif" width=3D8=20
border=3D1></A> ). Furthermore, the tumor spheres did<SUP> </SUP>not =
express=20
markers for differentiated neurons, astrocytes,<SUP> </SUP>or=20
oligodendrocytes.<SUP> </SUP>
<P><A name=3DT1><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><STRONG>View =
this=20
            table:</STRONG><BR><NOBR><A=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821/T1"=
>[in=20
            this window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View table in a separate =
window'; return true"=20
            onclick=3D"startTarget('T1', 500, 400); =
this.href=3D'/cgi/content-nw/full/63/18/5821/T1'"=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content-nw/full/63/18/5821/=
T1"=20
            target=3DT1>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft>Table 1 Summary of patient =
population
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR><A=20
name=3DF1><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821/F1"=
><IMG=20
            height=3D119 alt=3D" " hspace=3D10=20
            =
src=3D"http://cancerres.aacrjournals.org/content/vol63/issue18/images/sma=
ll/ch1833961001.gif"=20
            width=3D200 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (70K):<BR><NOBR><A=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821/F1"=
>[in=20
            this window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('F1', 590, 461); =
this.href=3D'/cgi/content-nw/full/63/18/5821/F1'"=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content-nw/full/63/18/5821/=
F1"=20
            target=3DF1>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft>Fig. 1. Primary brain tumors of =
different=20
            phenotypes form neurosphere-like colonies. Photomicrographs =
of=20
            cultured brain tumor cells (magnification <FONT=20
            face=3Darial,helvetica>x</FONT>20) at 24=9648 h after =
plating in TSM,=20
            containing EGF and bFGF. Each tumor subtype yielded growth =
of cells=20
            in neurosphere-like clusters, termed tumor spheres. Tumor =
spheres=20
            are shown from a medulloblastoma (<I>A</I>), pilocytic =
astrocytoma=20
            (<I>B</I>), ependymoma (<I>C</I>), and ganglioglioma =
(<I>D</I>).=20
            Undifferentiated primary tumor spheres from a =
medulloblastoma (<I>E,=20
            F, I</I>, and <I>J</I>) and a pilocytic astrocytoma (<I>G, =
H, K</I>,=20
            and <I>L</I>) are immunostained at 4 h for characteristic =
neural=20
            stem cell marker nestin (<I>E</I> and <I>G</I>) and for =
CD133=20
            (<I>F</I> and <I>H</I>). Individual undifferentiated =
medulloblastoma=20
            sphere cells and astrocytoma sphere cells are also shown =
stained for=20
            nestin (<I>I</I> and <I>K</I>) and CD133 (<I>J</I> and =
<I>L</I>).
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR><A=20
name=3DT2><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><STRONG>View =
this=20
            table:</STRONG><BR><NOBR><A=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821/T2"=
>[in=20
            this window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View table in a separate =
window'; return true"=20
            onclick=3D"startTarget('T2', 500, 400); =
this.href=3D'/cgi/content-nw/full/63/18/5821/T2'"=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content-nw/full/63/18/5821/=
T2"=20
            target=3DT2>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft>Table 2 Primary sphere formation =
assay
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR><STRONG>Tumor=20
Sphere Cells Exhibit Increased Potential For =
Self-Renewal.</STRONG><BR>Only a=20
small proportion (&lt;1%) of cells composing individual<SUP> =
</SUP>neurospheres=20
from a normal brain are stem cells with the ability<SUP> </SUP>to =
self-renew and=20
generate all neural lineages <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B9"=
>(9</A>=20
<A =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B13=
">,=20
13)</A> . The<SUP> </SUP>remaining majority are progenitor cells with =
more=20
restricted<SUP> </SUP>self-renewal capacity and lineage potential. Tumor =
spheres=20
are<SUP> </SUP>defined as clonally derived nonadherent colonies of cells =

derived<SUP> </SUP>from a single tumor stem cell. To build on the =
analogy=20
between<SUP> </SUP>neurosphere and tumor sphere, we subjected tumor =
spheres=20
to<SUP> </SUP>stem cell assays designed to test the self-renewal,=20
proliferation,<SUP> </SUP>and differentiation capacities of a putative=20
BTSC.<SUP> </SUP>
<P>The self-renewing capacity of the tumor spheres was assayed<SUP> =
</SUP>by=20
dissociation of primary tumor spheres, and plating of cells<SUP> =
</SUP>at serial=20
dilutions down to 1 cell/well. All of the dissociated<SUP> </SUP>primary =
tumor=20
spheres demonstrated the capacity to form secondary<SUP> </SUP>tumor =
spheres,=20
exhibiting an ability to self-renew. When self-renewal<SUP> =
</SUP>capacity was=20
compared among tumor subtypes at a plating density<SUP> </SUP>of 100 =
cells/well,=20
medulloblastomas were found to generate a<SUP> </SUP>greater mean number =
of=20
secondary tumor spheres (20.27 =B1<SUP> </SUP>SE 5.24), compared with =
pilocytic=20
astrocytomas (5.85 =B1<SUP> </SUP>SE 1.96) and to control sphere forming =
human=20
fetal neural stem<SUP> </SUP>cells (Clonetics; 2.88 =B1 SE 0.25; Fig. =
2<I>A</I><A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#F2"=
><IMG=20
height=3D7 alt=3DCitation=20
src=3D"http://cancerres.aacrjournals.org/icons/ref-arrow.gif" width=3D8=20
border=3D1></A> ).<SUP> </SUP>
<P><A name=3DF2><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821/F2"=
><IMG=20
            height=3D146 alt=3D" " hspace=3D10=20
            =
src=3D"http://cancerres.aacrjournals.org/content/vol63/issue18/images/sma=
ll/ch1833961002.gif"=20
            width=3D200 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (53K):<BR><NOBR><A=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821/F2"=
>[in=20
            this window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('F2', 590, 521); =
this.href=3D'/cgi/content-nw/full/63/18/5821/F2'"=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content-nw/full/63/18/5821/=
F2"=20
            target=3DF2>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft>Fig. 2. Tumor sphere cells =
exhibit=20
            increased self-renewal potential compared with controls. =
<I>A</I>,=20
            when tumor cells were plated at a density of 100 cells/well, =

            medulloblastomas were found to generate a greater mean =
number of=20
            secondary tumor spheres (20.27 =B1 5.24) than pilocytic =
astrocytomas=20
            (5.85 =B1 1.96) or control human neural stem cells (2.88 =B1 =
0.25).=20
            <I>B</I>, cells plated at limiting dilution in 200 =B5l =
volumes of=20
            medium showed that the frequency at which one tumor stem =
cell=20
            proliferates to form a secondary tumor sphere varied =
according to=20
            tumor pathology [representative samples of each tumor =
subtype shown:=20
            medulloblastoma, patient 14 (<IMG alt=3D{blacktriangleup}=20
            src=3D"http://cancerres.aacrjournals.org/math/utrif.gif" =
border=3D0>),=20
            pilocytic astrocytoma, patient 10 (<IMG alt=3D{circ}=20
            src=3D"http://cancerres.aacrjournals.org/math/cir.gif" =
border=3D0>), and=20
            control fetal human neural stem cells (<IMG alt=3D{bullet}=20
            src=3D"http://cancerres.aacrjournals.org/math/bullet.gif" =
border=3D0>)].=20
            The mean x-intercept values calculated from limiting =
dilution=20
            analysis for each tumor subtype reveal that the number of =
cells=20
            required to form at least 1 tumor sphere/well was much lower =
in=20
            medulloblastomas (<IMG alt=3D{circ}=20
            src=3D"http://cancerres.aacrjournals.org/math/cir.gif" =
border=3D0>),=20
            compared with gliomas (<IMG alt=3D{blacktriangleup}=20
            src=3D"http://cancerres.aacrjournals.org/math/utrif.gif" =
border=3D0>) or=20
            human controls (<IMG alt=3D{bullet}=20
            src=3D"http://cancerres.aacrjournals.org/math/bullet.gif" =
border=3D0>;=20
            Fig. 2<I>B;</I> Table 2<A=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#T2"=
><IMG=20
            height=3D7 alt=3DCitation=20
            =
src=3D"http://cancerres.aacrjournals.org/icons/ref-arrow.gif" width=3D8=20
            border=3D1></A> ). <I>C</I>, morphology of secondary tumor =
spheres was=20
            identical to that of primary tumor spheres (magnification =
<FONT=20
            face=3Darial,helvetica>x</FONT>200). <I>D</I> and <I>E</I>,=20
            undifferentiated secondary tumor spheres (magnification =
<FONT=20
            face=3Darial,helvetica>x</FONT>100) retain expression of =
neural stem=20
            cell markers nestin (with rhodamine, in <I>red</I>; =
<I>D</I>) and=20
            CD133 (with FITC, in <I>green</I>; <I>E</I>).
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR>If=20
a single tumor sphere results from the proliferation of a<SUP> =
</SUP>single=20
BTSC, limiting dilution analysis allows for the determination<SUP> =
</SUP>of the=20
minimal frequency of repopulating tumor sphere cells<SUP> </SUP>within =
the cell=20
population <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B6"=
>(6</A>=20
<A =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B7"=
>,=20
7)</A> . The number of cells required<SUP> </SUP>to generate at least 1 =
tumor=20
sphere/well was calculated as 23.5<SUP> </SUP>=B1 17.0 (SD) in the=20
medulloblastomas, 99.18 =B1 45.9<SUP> </SUP>(SD) in the pilocytic =
astrocytomas,=20
and 98.25 =B1 4.6 (SD)<SUP> </SUP>in the control human neural stem cells =
(Table=20
3<A =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#T3"=
><IMG=20
height=3D7 alt=3DCitation=20
src=3D"http://cancerres.aacrjournals.org/icons/ref-arrow.gif" width=3D8=20
border=3D1></A> ; Fig. 2<I>B</I><A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#F2"=
><IMG=20
height=3D7 alt=3DCitation=20
src=3D"http://cancerres.aacrjournals.org/icons/ref-arrow.gif" width=3D8=20
border=3D1></A> ).<SUP> </SUP>These data reveal that the frequency at =
which 1=20
tumor sphere<SUP> </SUP>cell will proliferate to form a new tumor sphere =
varied=20
according<SUP> </SUP>to tumor pathological subtype, with more aggressive =

medulloblastomas<SUP> </SUP>exhibiting increased self-renewal capacity =
compared=20
with pilocytic<SUP> </SUP>astrocytomas (<I>P</I> =3D 0.004) and human =
neural stem=20
cell controls<SUP> </SUP>(<I>P</I> =3D 0.001). Morphology of secondary =
tumor=20
spheres was identical<SUP> </SUP>to that of primary spheres (Fig. =
2<I>C</I>)<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#F2"=
><IMG=20
height=3D7 alt=3DCitation=20
src=3D"http://cancerres.aacrjournals.org/icons/ref-arrow.gif" width=3D8=20
border=3D1></A> , and secondary tumor spheres<SUP> </SUP>retain =
expression of the=20
neural stem cell markers nestin (Fig.<SUP> </SUP>2<I>D</I>)<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#F2"=
><IMG=20
height=3D7 alt=3DCitation=20
src=3D"http://cancerres.aacrjournals.org/icons/ref-arrow.gif" width=3D8=20
border=3D1></A> and CD133 (Fig. 2<I>E</I>)<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#F2"=
><IMG=20
height=3D7 alt=3DCitation=20
src=3D"http://cancerres.aacrjournals.org/icons/ref-arrow.gif" width=3D8=20
border=3D1></A> , whereas failing to express neural<SUP> =
</SUP>differentiation=20
markers. Secondary spheres from two medulloblastomas<SUP> </SUP>(patient =
7 and=20
patient 14) were passaged to tertiary spheres,<SUP> </SUP>and quantified =
by=20
limiting dilution at 12.5 cells/well and 20<SUP> </SUP>cells/well, =
respectively.=20
All of the tumors studied generated<SUP> </SUP>spheres with multiple =
passages.=20
These data show that all of<SUP> </SUP>the brain tumors had a =
subpopulation of=20
cells with a capacity<SUP> </SUP>to self-renew and that the self-renewal =
ability=20
of the tumors<SUP> </SUP>correlated with the clinical aggressiveness of =
the=20
different<SUP> </SUP>tumor phenotypes.<SUP> </SUP>
<P><A name=3DT3><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><STRONG>View =
this=20
            table:</STRONG><BR><NOBR><A=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821/T3"=
>[in=20
            this window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View table in a separate =
window'; return true"=20
            onclick=3D"startTarget('T3', 500, 400); =
this.href=3D'/cgi/content-nw/full/63/18/5821/T3'"=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content-nw/full/63/18/5821/=
T3"=20
            target=3DT3>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft>Table 3 Self renewal capacity of =
tumor=20
            subtypes
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR>To=20
evaluate proliferative capacity of tumor sphere cells, cells<SUP> =
</SUP>were=20
plated at 1000 cells/well, and the number of viable cells<SUP> </SUP>was =

quantified on days 0, 3, 5, and 7 after plating by the=20
3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium<SUP> </SUP>bromide=20
colorimetric assay. All of the tumor sphere cell populations<SUP> =
</SUP>assayed=20
demonstrated increased proliferative capacity compared<SUP> </SUP>with =
human=20
controls (Fig. 3<I>A</I>)<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#F3"=
><IMG=20
height=3D7 alt=3DCitation=20
src=3D"http://cancerres.aacrjournals.org/icons/ref-arrow.gif" width=3D8=20
border=3D1></A> . The histopathologic MIB-1 index<SUP> </SUP>is thought =
to=20
correlate with tumor proliferation. The mean MIB-1<SUP> </SUP>index of=20
medulloblastoma and pilocytic astrocytoma tumor specimens<SUP> </SUP>is =
shown in=20
Fig. 3<I>B</I><A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#F3"=
><IMG=20
height=3D7 alt=3DCitation=20
src=3D"http://cancerres.aacrjournals.org/icons/ref-arrow.gif" width=3D8=20
border=3D1></A> . We suggest that the differing tumor stem<SUP> =
</SUP>cell=20
proliferation rates are responsible for the MIB-1 indices<SUP> =
</SUP>observed in=20
various tumor subtypes.<SUP> </SUP>
<P><A name=3DF3><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821/F3"=
><IMG=20
            height=3D78 alt=3D" " hspace=3D10=20
            =
src=3D"http://cancerres.aacrjournals.org/content/vol63/issue18/images/sma=
ll/ch1833961003.gif"=20
            width=3D200 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (10K):<BR><NOBR><A=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821/F3"=
>[in=20
            this window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('F3', 590, 371); =
this.href=3D'/cgi/content-nw/full/63/18/5821/F3'"=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content-nw/full/63/18/5821/=
F3"=20
            target=3DF3>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft>Fig. 3. Tumor sphere cells =
exhibit=20
            increased proliferation consistent with histopathologic =
tumor=20
            mitotic indices. <I>A</I>, tumor stem cells from dissociated =

            medulloblastoma spheres (<IMG alt=3D{circ}=20
            src=3D"http://cancerres.aacrjournals.org/math/cir.gif" =
border=3D0>)=20
            showed a greater degree of cell proliferation than pilocytic =

            astrocytoma spheres (<IMG alt=3D{blacktriangleup}=20
            src=3D"http://cancerres.aacrjournals.org/math/utrif.gif" =
border=3D0>) or=20
            control human neurospheres (<IMG alt=3D{bullet}=20
            src=3D"http://cancerres.aacrjournals.org/math/bullet.gif" =
border=3D0>).=20
            <I>B</I>, the higher degree of proliferation of the tumor =
sphere=20
            cell population is associated with an increased mitotic rate =
of the=20
            tumor as a whole, as reflected by mean MIB-1 values of each =
tumor=20
            subtype (medulloblastomas, <IMG alt=3D{circ}=20
            src=3D"http://cancerres.aacrjournals.org/math/cir.gif" =
border=3D0>: mean=20
            MIB-1 =3D 43.5% =B1 17.4, <I>n</I> =3D 7; pilocytic =
astrocytoma, <IMG=20
            alt=3D{blacktriangleup}=20
            src=3D"http://cancerres.aacrjournals.org/math/utrif.gif" =
border=3D0>:=20
            mean MIB-1 =3D 1.5% =B1 0.5, <I>n</I> =3D 3).
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR><STRONG>BTSCs=20
Differentiate to Produce a Phenotype Identical to the Tumor <B><I>in=20
Situ</I></B>.</STRONG><BR>We next applied conditions used for normal =
neurosphere=20
differentiation<SUP> </SUP>to primary tumor spheres to determine whether =
the=20
BTSC was capable<SUP> </SUP>of multilineage differentiation. After=20
differentiation with<SUP> </SUP>10% FBS for 7 days, immunocytochemistry =
was=20
performed on tumor<SUP> </SUP>stem cells using the following antibodies: =
CD133,=20
nestin, =DF-tubulin<SUP> </SUP>3 (=DF-tub-3; for neurons), GFAP (for =
astrocytes),=20
and<SUP> </SUP>PDGFR-<IMG alt=3D{alpha}=20
src=3D"http://cancerres.aacrjournals.org/math/agr.gif" border=3D0> (for=20
oligodendrocytes). Immunocytochemistry was also<SUP> </SUP>performed on=20
undifferentiated primary tumor stem cells using<SUP> </SUP>the same =
panel of=20
antibodies.<SUP> </SUP>
<P>Undifferentiated tumor spheres from all of the tumor subtypes<SUP>=20
</SUP>exhibited immunoreactivity for CD133 and nestin, and lack of<SUP>=20
</SUP>immunoreactivity for markers of differentiated neural cell =
types<SUP>=20
</SUP>such as GFAP for astrocytes and =DF-tubulin 3 for neurons<SUP> =
</SUP>(Fig.=20
4, <I>A=96D</I>)<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#F4"=
><IMG=20
height=3D7 alt=3DCitation=20
src=3D"http://cancerres.aacrjournals.org/icons/ref-arrow.gif" width=3D8=20
border=3D1></A> . Strikingly, dissociated tumor spheres<SUP> </SUP>from =
all of the=20
specimens grown adherently and in serum for<SUP> </SUP>7 days =
preferentially=20
differentiated down the lineage that characterized<SUP> </SUP>the =
original tumor=20
phenotype of the patient (histopathology<SUP> </SUP>patient data not =
shown).=20
Thus, the majority of differentiated<SUP> </SUP>cells from a primary=20
medulloblastoma sphere expressed =DF-tub-3<SUP> </SUP>when =
differentiated (81.9% =B1=20
SD 6.02), reflecting the<SUP> </SUP>neuronal marker expression commonly =
seen in=20
medulloblastomas,<SUP> </SUP>whereas the majority of tumor stem cells =
from=20
pilocytic astrocytomas<SUP> </SUP>expressed GFAP when differentiated =
(77.9% =B1 SD=20
14.9),<SUP> </SUP>recapitulating the astrocytic lineage of the tumor =
(Fig.=20
4,<SUP> </SUP><I>A=96D</I>)<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#F4"=
><IMG=20
height=3D7 alt=3DCitation=20
src=3D"http://cancerres.aacrjournals.org/icons/ref-arrow.gif" width=3D8=20
border=3D1></A> . All of the tumor subtypes lost expression of =
CD133<SUP>=20
</SUP>and nestin when subjected to differentiating conditions (Fig.<SUP> =

</SUP>4, <I>A=96D</I>)<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#F4"=
><IMG=20
height=3D7 alt=3DCitation=20
src=3D"http://cancerres.aacrjournals.org/icons/ref-arrow.gif" width=3D8=20
border=3D1></A> . Although a small minority of differentiated<SUP> =
</SUP>cells=20
from each tumor subtype expressed other differentiated<SUP> </SUP>cell =
markers,=20
the overwhelming majority of differentiated cells<SUP> </SUP>expressed =
markers=20
that reflected the immunophenotype of the<SUP> </SUP>original tumor.=20
Interestingly, only medulloblastomas that expressed<SUP> </SUP>GFAP in =
the=20
primary tumor (by immunohistochemistry) were able<SUP> </SUP>to express =
GFAP=20
after tumor sphere differentiation <I>in vitro</I>,<SUP> =
</SUP>illustrating the=20
striking <I>in vitro</I> recapitulation of tumor phenotype<SUP> =
</SUP>within=20
tumors of the same histopathological subtype. In addition,<SUP> </SUP>2=20
medulloblastoma specimens (Patients 2 and 4, 20.5% =B1<SUP> </SUP>3.35)=20
demonstrated costaining for =DF-tub-3 and GFAP<SUP> </SUP>(Fig. 4<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#F4"=
><IMG=20
height=3D7 alt=3DCitation=20
src=3D"http://cancerres.aacrjournals.org/icons/ref-arrow.gif" width=3D8=20
border=3D1></A> <I>E, bottom panel</I>), whereas the majority of=20
differentiated<SUP> </SUP>medulloblastoma tumor cells (60.3% =B1 SD =
3.55) in=20
these<SUP> </SUP>tumors stained for =DF-tub-3 alone (Fig. 4<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#F4"=
><IMG=20
height=3D7 alt=3DCitation=20
src=3D"http://cancerres.aacrjournals.org/icons/ref-arrow.gif" width=3D8=20
border=3D1></A> <I>E, top panel</I>).<SUP> </SUP>Immunocytochemistry was =
repeated=20
on these samples for another<SUP> </SUP>neuronal marker, =
mitogen-activated=20
protein-2, and costaining<SUP> </SUP>with GFAP was again evident (data =
not=20
shown). This differentiated<SUP> </SUP>tumor stem cell immunophenotype =
may=20
represent a bipotential<SUP> </SUP>precursor cell, such as has been =
identified=20
previously by Kilpatrick<SUP> </SUP>and Bartlett <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B14=
">(14)</A>=20
in normal neural precursor cells. These results<SUP> </SUP>show that the =
BTSC=20
may re-establish the original tumor and demonstrate<SUP> </SUP>that =
brain tumors=20
are heterogeneous and consist of a differentiating<SUP> </SUP>population =
that=20
originates from a BTSC.<SUP> </SUP>
<P><A name=3DF4><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
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    <TD>
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          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821/F4"=
><IMG=20
            height=3D122 alt=3D" " hspace=3D10=20
            =
src=3D"http://cancerres.aacrjournals.org/content/vol63/issue18/images/sma=
ll/ch1833961004.gif"=20
            width=3D200 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (35K):<BR><NOBR><A=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821/F4"=
>[in=20
            this window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('F4', 590, 469); =
this.href=3D'/cgi/content-nw/full/63/18/5821/F4'"=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content-nw/full/63/18/5821/=
F4"=20
            target=3DF4>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft>Fig. 4. Tumor spheres =
differentiate to=20
            express immunophenotypes similar to the primary tumor.=20
            Immunocytochemistry was performed on tumor stem cells using =
CD133=20
            (<IMG alt=3D{square}=20
            src=3D"http://cancerres.aacrjournals.org/math/square.gif" =
border=3D0>),=20
            nestin (<IMG height=3D11=20
            =
src=3D"http://cancerres.aacrjournals.org/content/vol63/issue18/images/sma=
ll/cjs2113.gif"=20
            width=3D11 border=3D0>), =DF-tubulin 3 (<IMG height=3D11=20
            =
src=3D"http://cancerres.aacrjournals.org/content/vol63/issue18/images/sma=
ll/cjs2112.gif"=20
            width=3D11 border=3D0>), GFAP (<IMG alt=3D{blacksquare}=20
            src=3D"http://cancerres.aacrjournals.org/math/squf.gif" =
border=3D0>),=20
            and PDGFR-<IMG alt=3D{alpha}=20
            src=3D"http://cancerres.aacrjournals.org/math/agr.gif" =
border=3D0> (<IMG=20
            height=3D11=20
            =
src=3D"http://cancerres.aacrjournals.org/content/vol63/issue18/images/sma=
ll/cjs2106.gif"=20
            width=3D11 border=3D0>). <I>A=96D</I>, all tumor spheres =
lost expression=20
            of CD133 and nestin when differentiated. Dissociated tumor =
spheres=20
            preferentially differentiated down the lineage that =
characterized=20
            the original tumor phenotype (<I>A</I>), pilocytic =
astrocytoma=20
            (specimen from Patient 9); (<I>B</I>), medulloblastoma =
(specimen=20
            from Patient 7). Tumor stem cells (77.9%) from pilocytic=20
            astrocytomas expressed GFAP (<I>A</I> and <I>C</I>), whereas =
81.9%=20
            of tumor stem cells from medulloblastomas expressed the =
early=20
            neuronal marker =DF-tubulin 3 (<I>B</I> and <I>D</I>) when=20
            differentiated. <I>E</I>, whereas the majority of cells =
within two=20
            medulloblastoma cultures (patients 2 and 4) differentiated =
into=20
            cells with a neuronal immunophenotype (<I>top panel</I>,=20
            magnification <FONT face=3Darial,helvetica>x</FONT>200, =
immunostaining=20
            with =DF-tubulin-3), these cultures showed a small =
population of cells=20
            that costained for =DF-tubulin 3 and GFAP (<I>bottom =
panel</I>,=20
            magnification <FONT face=3Darial,helvetica>x</FONT>400; GFAP =
and=20
            rhodamine in <I>red</I>, =DF-tubulin 3 and ALEXA 488 in =
<I>green</I>).
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR><STRONG>CD133+=20
Tumor Cells Show Marked Stem Cell Activity.</STRONG><BR>To better define =
the=20
BTSC, we needed a surface marker that would<SUP> </SUP>enable isolation. =
CD133=20
is a novel 120 kDa five-transmembrane<SUP> </SUP>cell surface protein =
originally=20
shown to be a hematopoietic<SUP> </SUP>stem cell marker, and found =
recently to=20
be a marker of normal<SUP> </SUP>human neural stem cells <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B5"=
>(5</A>=20
<A =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B12=
">,=20
12</A> <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B15=
">,=20
15)</A> . We demonstrated CD133<SUP> </SUP>expression by =
immunohistochemistry in=20
brain tumors (Fig. 5<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#F5"=
><IMG=20
height=3D7 alt=3DCitation=20
src=3D"http://cancerres.aacrjournals.org/icons/ref-arrow.gif" width=3D8=20
border=3D1></A> <I>A,<SUP> </SUP>medulloblastoma, patient 1</I>), =
showing a plasma=20
membrane staining<SUP> </SUP>pattern also characterized in other =
tissues. To=20
determine whether<SUP> </SUP>CD133 was present in tumor sphere cultures, =
we=20
analyzed the<SUP> </SUP>expression of CD133 using flow cytometry, and we =
sorted=20
for<SUP> </SUP>CD133 positive and negative cell populations using =
magnetic<SUP>=20
</SUP>bead cell sorting.<SUP> </SUP>
<P><A name=3DF5><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
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    <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/63/18/5821/F5"=
><IMG=20
            height=3D200 alt=3D" " hspace=3D10=20
            =
src=3D"http://cancerres.aacrjournals.org/content/vol63/issue18/images/sma=
ll/ch1833961005.gif"=20
            width=3D140 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/63/18/5821/F5"=
>[in=20
            this window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('F5', 457, 640); =
this.href=3D'/cgi/content-nw/full/63/18/5821/F5'"=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content-nw/full/63/18/5821/=
F5"=20
            target=3DF5>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft>Fig. 5. CD133+ tumor cells show =
marked=20
            stem cell activity. <I>A</I>, immunohistochemistry for CD133 =
shows a=20
            plasma membrane staining pattern in scattered cells within a =

            medulloblastoma. BTSCs from both medulloblastomas and =
pilocytic=20
            astrocytomas were immunostained for CD133 and subjected to =
flow=20
            cytometry for quantification of CD133 expression (Table 3)<A =

            =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#T3"=
><IMG=20
            height=3D7 alt=3DCitation=20
            =
src=3D"http://cancerres.aacrjournals.org/icons/ref-arrow.gif" width=3D8=20
            border=3D1></A> , which varied widely in each tumor subtype. =
<I>B</I>,=20
            flow cytometry histogram in representative medulloblastoma =
tumor=20
            cells (from patient 6), with the first peak (gate M1) =
representing=20
            cells negative for CD133-phycoerythrin expression, and the =
second=20
            peak (gate M2) representing CD133 positive cells. Tumor =
cells were=20
            then sorted for CD133 expression by magnetic bead cell =
sorting.=20
            CD133+ and CD133- populations were collected, checked for =
purity by=20
            flow cytometry, and cultured separately in TSM for stem cell =
assays.=20
            Purity was found to range from 46.9 to 79.8% in CD133+ =
populations,=20
            and 92.6 to 97.3% in CD133- populations. <I>C</I>, CD133+ =
tumor=20
            cells proliferated in culture as nonadherent spheres, =
whereas CD133-=20
            tumor cells adhered to culture dishes, did not proliferate =
and did=20
            not form spheres. <I>D</I>, limiting dilution analysis =
showed that=20
            self-renewal capacity resides in the CD133+ tumor cell =
population=20
            (CD133+cells, <IMG alt=3D{blacktriangleup}=20
            src=3D"http://cancerres.aacrjournals.org/math/utrif.gif" =
border=3D0>;=20
            unsorted tumor cells, <IMG alt=3D{bullet}=20
            src=3D"http://cancerres.aacrjournals.org/math/bullet.gif" =
border=3D0>;=20
            CD133- cells, <IMG alt=3D{blacksquare}=20
            src=3D"http://cancerres.aacrjournals.org/math/squf.gif" =
border=3D0>).=20
            <I>E</I>, cell proliferation assays demonstrate that CD133+ =
cells=20
            (<IMG alt=3D{blacktriangleup}=20
            src=3D"http://cancerres.aacrjournals.org/math/utrif.gif" =
border=3D0>)=20
            possess marked proliferative capacity, whereas CD133- cells =
do not=20
            (<IMG alt=3D{blacksquare}=20
            src=3D"http://cancerres.aacrjournals.org/math/squf.gif" =
border=3D0>;=20
            unsorted tumor cells, <IMG alt=3D{bullet}=20
            src=3D"http://cancerres.aacrjournals.org/math/bullet.gif" =
border=3D0>).
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR>Flow=20
cytometric quantification of CD133 expression in brain<SUP> </SUP>tumor =
cultures=20
ranged from 3.5% to 46.3% in both medulloblastomas<SUP> </SUP>and =
pilocytic=20
astrocytomas (Table 4)<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#T4"=
><IMG=20
height=3D7 alt=3DCitation=20
src=3D"http://cancerres.aacrjournals.org/icons/ref-arrow.gif" width=3D8=20
border=3D1></A> . The lower-grade astrocytomas<SUP> </SUP>typically had =
a lower=20
CD133 fraction compared with high-grade<SUP> </SUP>medulloblastomas. =
When tumor=20
cell cultures were sorted for CD133<SUP> </SUP>expression (Fig. =
5<I>B</I>)<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#F5"=
><IMG=20
height=3D7 alt=3DCitation=20
src=3D"http://cancerres.aacrjournals.org/icons/ref-arrow.gif" width=3D8=20
border=3D1></A> , CD133 positive and negative cell populations<SUP> =
</SUP>were=20
collected and cultured separately, under the same conditions<SUP> =
</SUP>as=20
unsorted BTSCs. Sorted CD133+ and CD133- aliquots from each<SUP> =
</SUP>tumor=20
were checked by flow cytometry to evaluate the efficiency<SUP> </SUP>of =
sorting:=20
purity of the CD133+ populations ranged from 46.9%<SUP> </SUP>to 79.8%, =
and=20
purity of the CD133- populations ranged from 92.6%<SUP> </SUP>to 97.3%. =
Over a=20
7-day culture period in SFM and growth factors,<SUP> </SUP>CD133+ tumor =
cells=20
demonstrated growth as nonadherent tumor<SUP> </SUP>spheres, which =
continued to=20
expand the cell population (Fig.<SUP> </SUP>5<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#F5"=
><IMG=20
height=3D7 alt=3DCitation=20
src=3D"http://cancerres.aacrjournals.org/icons/ref-arrow.gif" width=3D8=20
border=3D1></A> <I>C, top panels</I>). However, CD133- cells adhered to =
the=20
culture<SUP> </SUP>dishes, did not proliferate, and did not form spheres =

(Fig.<SUP> </SUP>5<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#F5"=
><IMG=20
height=3D7 alt=3DCitation=20
src=3D"http://cancerres.aacrjournals.org/icons/ref-arrow.gif" width=3D8=20
border=3D1></A> <I>C, bottom panels</I>).<SUP> </SUP>
<P><A name=3DT4><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><STRONG>View =
this=20
            table:</STRONG><BR><NOBR><A=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821/T4"=
>[in=20
            this window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View table in a separate =
window'; return true"=20
            onclick=3D"startTarget('T4', 500, 400); =
this.href=3D'/cgi/content-nw/full/63/18/5821/T4'"=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content-nw/full/63/18/5821/=
T4"=20
            target=3DT4>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft>Table 4 CD133 expression of =
brain tumor=20
            stem cells
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR>The=20
observed stem cell activity of CD133+ tumor cells was confirmed<SUP> =
</SUP>when=20
CD133+ and CD133- tumor cells from 8 tumors (4 medulloblastomas,<SUP> =
</SUP>3=20
pilocytic astrocytomas, and 1 ganglioglioma) were plated at<SUP> =
</SUP>limiting=20
dilutions (Fig. 5<I>D</I>)<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#F5"=
><IMG=20
height=3D7 alt=3DCitation=20
src=3D"http://cancerres.aacrjournals.org/icons/ref-arrow.gif" width=3D8=20
border=3D1></A> . These data show that the capacity<SUP> </SUP>for tumor =

self-renewal resides in the CD133+ fraction, and that<SUP> </SUP>this =
stem cell=20
property is absent in the CD133- tumor cell population.<SUP> </SUP>Cell=20
proliferation assays of tumor cells sorted for CD133 expression<SUP>=20
</SUP>demonstrate that CD133+ cells possess proliferative capacity,<SUP> =

</SUP>whereas CD133- cells did not proliferate (Fig. 5<I>E</I>)<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#F5"=
><IMG=20
height=3D7 alt=3DCitation=20
src=3D"http://cancerres.aacrjournals.org/icons/ref-arrow.gif" width=3D8=20
border=3D1></A> . Thus, CD133<SUP> </SUP>identifies an exclusive =
subpopulation of=20
brain tumor cells that<SUP> </SUP>have neural stem cell activity.<SUP> =
</SUP>
<P><STRONG>BTSC Cultures Exhibit Abnormal Karyotypes and Are Not =
Migrating=20
Normal Neural Stem Cells.</STRONG><BR>Because normal stem cells can =
migrate to=20
sites of injury, and<SUP> </SUP>brain tumor cultures may potentially be=20
contaminated with some<SUP> </SUP>normal neural stem cells, we conducted =

appropriate cellular<SUP> </SUP>and genetic analyses to demonstrate that =
the=20
BTSC we isolated<SUP> </SUP>was indeed transformed and are not normal =
brain stem=20
cells.<SUP> </SUP>
<P>Cellular analyses of medulloblastoma cultures sorted for CD133<SUP>=20
</SUP>expression reveal that neither CD133+ nor CD133- cell =
differentiation<SUP>=20
</SUP>profiles resemble the differentiation profile of a normal =
human<SUP>=20
</SUP>neural stem cell (Fig. 6, <I>A</I> and <I>B</I>)<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#F6"=
><IMG=20
height=3D7 alt=3DCitation=20
src=3D"http://cancerres.aacrjournals.org/icons/ref-arrow.gif" width=3D8=20
border=3D1></A> . Normal human neural stem<SUP> </SUP>cells demonstrate=20
multipotentiality by differentiating into<SUP> </SUP>characteristic =
proportions=20
of astrocytes (50=9660%), neurons<SUP> </SUP>(20=9630%), and =
oligodendrocytes=20
(5=9610%; Fig. 6<I>C</I><A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#F6"=
><IMG=20
height=3D7 alt=3DCitation=20
src=3D"http://cancerres.aacrjournals.org/icons/ref-arrow.gif" width=3D8=20
border=3D1></A> ).<SUP> </SUP>However, differentiated CD133+ cells that =
harbor=20
stem cell activity<SUP> </SUP>and CD133- tumor cells sorted from a=20
medulloblastoma exhibit<SUP> </SUP>an abnormally high proportion of =
cells=20
immunostaining for =DF-III<SUP> </SUP>tubulin (86.5% and 83.0%, =
respectively),=20
resembling the original<SUP> </SUP>tumor rather than normal brain =
phenotype=20
(Fig. 6, <I>A</I> and <I>B</I>)<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#F6"=
><IMG=20
height=3D7 alt=3DCitation=20
src=3D"http://cancerres.aacrjournals.org/icons/ref-arrow.gif" width=3D8=20
border=3D1></A> .<SUP> </SUP>
<P><A name=3DF6><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821/F6"=
><IMG=20
            height=3D200 alt=3D" " hspace=3D10=20
            =
src=3D"http://cancerres.aacrjournals.org/content/vol63/issue18/images/sma=
ll/ch1833961006.gif"=20
            width=3D192 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (51K):<BR><NOBR><A=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821/F6"=
>[in=20
            this window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('F6', 572, 640); =
this.href=3D'/cgi/content-nw/full/63/18/5821/F6'"=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content-nw/full/63/18/5821/=
F6"=20
            target=3DF6>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft>Fig. 6. Unlike normal neural =
stem cells,=20
            the BTSC has undergone transformation. <I>A</I>, normal =
human neural=20
            stem cells differentiate into characteristic proportions of=20
            astrocytes (GFAP, <IMG height=3D11=20
            =
src=3D"http://cancerres.aacrjournals.org/content/vol63/issue18/images/sma=
ll/cjs2112.gif"=20
            width=3D11 border=3D0>), neurons (=DF-tubulin 3, <IMG =
alt=3D{blacksquare}=20
            src=3D"http://cancerres.aacrjournals.org/math/squf.gif" =
border=3D0>) and=20
            oligodendrocytes (PDGFR-<IMG alt=3D{alpha}=20
            src=3D"http://cancerres.aacrjournals.org/math/agr.gif" =
border=3D0>, <IMG=20
            height=3D11=20
            =
src=3D"http://cancerres.aacrjournals.org/content/vol63/issue18/images/sma=
ll/cjs2106.gif"=20
            width=3D11 border=3D0>) reflecting the composition of normal =
brain.=20
            Immunostaining for CD133 (<IMG alt=3D{square}=20
            src=3D"http://cancerres.aacrjournals.org/math/square.gif" =
border=3D0>)=20
            and nestin (<IMG height=3D11=20
            =
src=3D"http://cancerres.aacrjournals.org/content/vol63/issue18/images/sma=
ll/cjs2113.gif"=20
            width=3D11 border=3D0>) is characteristically lost after=20
            differentiation. <I>B</I> and <I>C</I>, both differentiated =
CD133+=20
            (<I>B</I>) and CD133- (<I>C</I>) tumor cells sorted from a=20
            medulloblastoma exhibit abnormally high proportions of cells =

            staining for =DF-tubulin 3 (<IMG alt=3D{blacksquare}=20
            src=3D"http://cancerres.aacrjournals.org/math/squf.gif" =
border=3D0>),=20
            recapitulating the original tumor phenotype. Note that =
CD133- cells=20
            display minimal staining for undifferentiated cell markers =
CD133=20
            (<IMG alt=3D{square}=20
            src=3D"http://cancerres.aacrjournals.org/math/square.gif" =
border=3D0>)=20
            and nestin (<IMG height=3D11=20
            =
src=3D"http://cancerres.aacrjournals.org/content/vol63/issue18/images/sma=
ll/cjs2113.gif"=20
            width=3D11 border=3D0>). <I>D</I>, spectral karyotype =
analysis performed=20
            on tumor sphere cells isolated from a medulloblastoma shows =
changes=20
            typical of medulloblastoma, including loss of chromosomes 10 =
and 16,=20
            and gain of chromosome 18.
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR>We=20
also performed cytogenetic analysis and SKY <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B8"=
>(8)</A>=20
using metaphase<SUP> </SUP>preparations obtained directly from cultured =
tumor=20
spheres from<SUP> </SUP>a medulloblastoma (Patient 7; Fig. 6<I>D</I><A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#F6"=
><IMG=20
height=3D7 alt=3DCitation=20
src=3D"http://cancerres.aacrjournals.org/icons/ref-arrow.gif" width=3D8=20
border=3D1></A> ). After dissociation<SUP> </SUP>of the primary tumor =
and=20
formation of primary tumor spheres,<SUP> </SUP>medulloblastoma cells =
were again=20
dissociated and metaphase spreads<SUP> </SUP>were prepared. Detailed SKY =

analysis was possible in 8 metaphases,<SUP> </SUP>and all of the cells =
had an=20
identical clonally abnormal karyotype.<SUP> </SUP>In all of the =
metaphases the=20
consistent numerical alterations<SUP> </SUP>45 XY, -10, -16, and +18 =
were=20
present. Of these alterations,<SUP> </SUP>loss of chromosome 10 is one =
of the=20
most characteristic findings<SUP> </SUP>in medulloblastoma <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B16=
">(16</A>=20
<A =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B17=
">,=20
17)</A> . We also performed interphase<SUP> </SUP>fluorescent <I>in =
situ</I>=20
hybridization on another medulloblastoma<SUP> </SUP>specimen (Patient =
14), from=20
which tumor cells underwent magnetic<SUP> </SUP>bead cell sorting for =
CD133.=20
Unsorted tumor cells, CD133+ purified<SUP> </SUP>tumor stem cells, and =
CD133-=20
cells were probed for centromere<SUP> </SUP>17 and the <I>p53</I> locus =
on=20
chromosome 17p. All three cell populations<SUP> </SUP>(unsorted, CD133+, =
and=20
CD133-) showed presence of isochromosome<SUP> </SUP>17q (data not =
shown). Taken=20
together, these cellular and genetic<SUP> </SUP>data demonstrate that =
the=20
tumor-derived sphere cells possess<SUP> </SUP>an abnormal karyotype and =
are not=20
contaminating normal neural<SUP> </SUP>stem cells. Rather, these cells =
have=20
undergone a transformation<SUP> </SUP>event, incurring the enhanced =
self-renewal=20
and proliferation<SUP> </SUP>properties we observed <I>in =
vitro</I>.<SUP> </SUP>
<P><A name=3DSEC4><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
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/63/18/5821#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/63/18/5821#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/63/18/5821#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/63/18/5821#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/63/18/5821#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/63/18/5821#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 cells=20
are functionally defined as self-renewing, multipotent<SUP> </SUP>cells =
that=20
exhibit multilineage differentiation <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B18=
">(18</A>=20
<A =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B19=
">,=20
19)</A> .<SUP> </SUP>Somatic stem cells are thought to self-renew to =
generate=20
all<SUP> </SUP>of the mature cell types of a particular tissue through=20
differentiation,<SUP> </SUP>although rigorous identification and =
isolation of=20
tissue-specific<SUP> </SUP>stem cells has been accomplished =
prospectively in=20
only a few<SUP> </SUP>organ systems <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B2"=
>(2)</A>=20
. The neurosphere assay has permitted rigorous<SUP> </SUP><I>in =
vitro</I>=20
characterization of the neural stem cell, but prospective<SUP> =
</SUP>study of=20
this cell has been limited previously by lack of cell<SUP> </SUP>surface =
markers=20
necessary for its isolation.<SUP> </SUP>
<P>The potential that a neural stem cell may be transformed into<SUP> =
</SUP>a=20
brain tumor has long been considered, but no prospective isolation<SUP> =
</SUP>of=20
stem cells has been performed in brain tumors. Brain tumor<SUP> =
</SUP>cells can=20
express the neural stem cell marker nestin <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B20=
">(20</A>=20
<A =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B21=
">,=20
21)</A> ,<SUP> </SUP>and brain tumors are comprised of cells expressing=20
phenotypes<SUP> </SUP>of more that one neural lineage. Microarray =
analysis of=20
human<SUP> </SUP>medulloblastomas also suggests a similarity of gene=20
expression<SUP> </SUP>with normal developing brain cells <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B22=
">(22)</A>=20
. Recent experiments<SUP> </SUP>in mice also suggest that neural =
progenitors may=20
be transformed<SUP> </SUP>into brain tumors. Mouse brain cells =
expressing neural=20
progenitor<SUP> </SUP>markers are more receptive to oncogenic =
transformation=20
than<SUP> </SUP>differentiated brain cells <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B23=
">(23</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B24=
">24</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B25=
">25</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B26=
">26)</A>=20
. However, others<SUP> </SUP>suggest that a differentiated neural cell =
is=20
equally permissive<SUP> </SUP>to transformation if it has a key genetic=20
alteration <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B27=
">(27)</A>=20
.<SUP> </SUP>
<P>The concept of the cancer stem cell arose from the observation<SUP> =
</SUP>of=20
striking similarities between the self-renewal mechanisms<SUP> </SUP>of =
stem=20
cells and cancer cells <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B2"=
>(2)</A>=20
. In malignancies such as<SUP> </SUP>leukemia <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B1"=
>(1)</A>=20
, multiple myeloma <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B28=
">(28)</A>=20
, and most recently breast<SUP> </SUP>cancer <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B29=
">(29)</A>=20
, rare cells were isolated with a remarkable potential<SUP> </SUP>for=20
self-renewal, and these cells alone were found to drive<SUP> </SUP>the =
formation=20
and growth of tumors. Because normal somatic stem<SUP> </SUP>cells must=20
self-renew and maintain a relative balance between<SUP> =
</SUP>self-renewal and=20
differentiation, cancer can be contextualized<SUP> </SUP>as a disease of =

unregulated self-renewal <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B2"=
>(2)</A>=20
.<SUP> </SUP>
<P>In this report, we have identified a new population of cancer<SUP> =
</SUP>stem=20
cells in brain tumors of different phenotypes. These tumor<SUP> =
</SUP>stem cells=20
represented a fraction of the total cells comprising<SUP> </SUP>the =
tumor, and=20
they were identified by CD133 expression. There<SUP> </SUP>are three =
pieces of=20
evidence that support that these cells are<SUP> </SUP>BTSCs: (<I>a</I>) =
they=20
generate clusters of clonally derived cells<SUP> </SUP>resembling =
neurospheres;=20
(<I>b</I>) they self-renew and proliferate;<SUP> </SUP>and (<I>c</I>) =
they=20
differentiate to recapitulate the phenotype of<SUP> </SUP>the tumor from =
which=20
they were derived.<SUP> </SUP>
<P>The application of principles for study of normal neural stem<SUP>=20
</SUP>cells to brain tumor cell populations establishes a link =
between<SUP>=20
</SUP>normal neurogenesis and brain tumorigenesis. Brain tumors are<SUP> =

</SUP>not only phenotypically heterogeneous but are also =
functionally<SUP>=20
</SUP>heterogeneous. Brain tumors exhibit phenotypic heterogeneity,<SUP> =

</SUP>being composed of cells expressing both undifferentiated and<SUP>=20
</SUP>differentiated markers. Our data suggest that brain tumors =
are<SUP>=20
</SUP>comprised of populations of proliferating tumor stem cells =
that<SUP>=20
</SUP>are differentiating into the more mature cell types, which=20
characterize<SUP> </SUP>the tumor. Purification of CD133+ cells in brain =
tumors=20
implies<SUP> </SUP>that a hierarchy may exist in the tumor cell =
population,=20
because<SUP> </SUP>not all of the tumor cells were capable of =
maintaining the=20
tumor<SUP> </SUP>in culture. This apparent hierarchy may be functionally =

elucidated<SUP> </SUP>as more surface markers for neural stem cells =
emerge and=20
additional<SUP> </SUP>tumor subpopulations are identified. The data =
suggest that=20
the<SUP> </SUP>tumors originate from tumor cells that express CD133, as=20
this<SUP> </SUP>fraction exclusively had the ability to proliferate,=20
self-renew,<SUP> </SUP>and differentiate. Because normal neural stem =
cells are=20
also<SUP> </SUP>found in the CD133 population of the normal human fetal=20
brain,<SUP> </SUP>it suggests that the cell of origin for a brain tumor =
may=20
be<SUP> </SUP>a normal neural stem cell. Future investigations of the =
BTSC<SUP>=20
</SUP>may lead to additional insight of this possibility, and may<SUP>=20
</SUP>clarify whether the BTSC sits at the top of a lineage =
hierarchy,<SUP>=20
</SUP>or further down as a lineage-restricted progenitor.<SUP> </SUP>
<P>We recall the principles that first defined the cellular =
organization<SUP>=20
</SUP>of proliferative blast cells in leukemia to understand the=20
tumor-specific<SUP> </SUP>differentiation profile. Buick <I>et al.</I> =
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B30=
">(30)</A>=20
first proposed that<SUP> </SUP>malignant transformation might limit the=20
differentiation capacity<SUP> </SUP>of normal pluripotent stem cells and =
cited=20
experimental support<SUP> </SUP>for this "blocked differentiation" model =
in the=20
culture of bone<SUP> </SUP>marrow from leukemia patients. Moreover, if a =
tumor=20
is viewed<SUP> </SUP>as an aberrant organ initiated by a cancer stem =
cell <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#B2"=
>(2)</A>=20
, then<SUP> </SUP>the role of the tumor stem cell would be necessarily=20
lineage-restricted<SUP> </SUP>to generate only the mature cells that =
comprise=20
the tumor. It<SUP> </SUP>is intriguing to speculate whether specific =
growth=20
factors could<SUP> </SUP>force lineage-restricted tumor stem cells to=20
differentiate down<SUP> </SUP>a different pathway; for example, could a =
neuronal=20
growth factor<SUP> </SUP>impose a neuronal fate on stem cells from a =
pilocytic=20
astrocytoma?<SUP> </SUP>We do not believe that absence of multilineage=20
differentiation<SUP> </SUP>of the BTSC refutes that these cells are stem =
cells,=20
because<SUP> </SUP>some cells differentiated into more than one lineage, =
and=20
these<SUP> </SUP>cells uniquely had the ability to proliferate and=20
self-renew<SUP> </SUP>to generate differentiated progeny that comprise =
the=20
tumor.<SUP> </SUP>The BTSCs from the different tumor phenotypes and =
patient=20
samples<SUP> </SUP>demonstrated little variability in marker expression, =

which<SUP> </SUP>was also expressed in normal neural stem cells. This=20
limited<SUP> </SUP>variation in marker phenotype for the BTSC for =
different=20
tumors<SUP> </SUP>suggests that normal neural stem cells as opposed to=20
committed<SUP> </SUP>progenitors are the more likely targets of=20
transformation.<SUP> </SUP>
<P>In this study, we provide new insight into the brain tumorigenic<SUP> =

</SUP>process. With evidence of self-renewal, proliferation, and=20
lineage-restricted<SUP> </SUP>differentiation that recapitulates the =
original=20
tumor phenotype,<SUP> </SUP>we define a class of BTSCs that can be =
prospectively=20
isolated<SUP> </SUP>from many brain tumors. These cells grow as=20
neurosphere-like<SUP> </SUP>clusters and expressed neural stem cell =
markers. We=20
also provide<SUP> </SUP>evidence to support the use of a novel stem cell =
assay,=20
namely<SUP> </SUP>cell sorting for CD133 expression, for the =
purification of=20
the<SUP> </SUP>BTSC from brain tumors. These findings support the=20
application<SUP> </SUP>of principles of leukemogenesis to solid tumors: =
namely,=20
the<SUP> </SUP>principle that only a small subset of cancer stem cells =
is=20
enriched<SUP> </SUP>for clonogenic capacity and that these cells alone =
are=20
capable<SUP> </SUP>of tumor propagation.<SUP> </SUP>
<P>The identification of the BTSC has important implications for<SUP>=20
</SUP>understanding the molecular mechanisms of brain =
tumorigenesis,<SUP>=20
</SUP>as current molecular pathological analyses of global tumor =
cell<SUP>=20
</SUP>populations (such as is performed in tumor microarray =
experiments)<SUP>=20
</SUP>may not be sufficient to determine the key molecular =
alterations<SUP>=20
</SUP>in rarer tumor stem cells. The presence of a BTSC will also<SUP>=20
</SUP>have important implications for understanding brain tumor=20
dissemination<SUP> </SUP>if these are the cells that migrate and =
establish=20
central nervous<SUP> </SUP>system metastasis. The functional analysis of =
the=20
BTSC may also<SUP> </SUP>provide a novel means for testing of new =
treatment=20
strategies<SUP> </SUP>that focus on the eradication of the tumor =
maintaining=20
BTSC.<SUP> </SUP>The fact that we are able to differentiate BTSCs into=20
cells<SUP> </SUP>that express more mature markers supports that =
additional=20
exploration<SUP> </SUP>of the dynamic tumor differentiation process may =
lead to=20
differentiation<SUP> </SUP>therapy. Finally, as it has been emerging =
that normal=20
stem cells<SUP> </SUP>and cancer cells share similar phenotypic and =
functional=20
properties,<SUP> </SUP>studies of stem cells found in brain tumors may =
shed=20
additional<SUP> </SUP>light on the biology of normal neural stem =
cells.<SUP>=20
</SUP>
<P><SUP></SUP>
<P><SUP></SUP>
<P><SUP></SUP>
<P><SUP></SUP>
<P><SUP></SUP>
<P><A name=3DACK><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
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>We =
thank John Dick=20
for inspiration, mentorship, and guidance;<SUP> </SUP>Sean Egan for =
invaluable=20
help and advice; Michael Ho, Gisele<SUP> </SUP>Knowles, Jane Bayani, and =
Jana=20
Karaskova for expert technical<SUP> </SUP>assistance; and Todd Mainprize =
and=20
Ajay Pandita for helpful<SUP> </SUP>discussions. We thank Dr. Wieland =
Huttner=20
for antihuman prominin<SUP> </SUP>antibody. We also honor the late Larry =
Becker=20
for his constant<SUP> </SUP>devotion to the principles of our work, and =
his=20
inspired efforts<SUP> </SUP>on our behalf.<SUP> </SUP>
<P><A name=3DFN><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
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>The costs of publication of this article were =
defrayed=20
in part<SUP> </SUP>by the payment of page charges. This article must=20
therefore<SUP> </SUP>be hereby marked <I>advertisement</I> in accordance =
with 18=20
U.S.C.<SUP> </SUP>Section 1734 solely to indicate this fact.<SUP> </SUP>
<P><A name=3DFN1><!-- null --></A><SUP>1</SUP> P. D. is supported by =
National=20
Cancer Institute of Canada with<SUP> </SUP>funds from the Terry Fox Run, =
the=20
Arthur and Sonia Labatt Brain<SUP> </SUP>Tumour Research Center, the =
Hospital=20
for Sick Children Research<SUP> </SUP>Institute, and a gift from the =
Baker=20
Family. S. S. is supported<SUP> </SUP>by a fellowship from the =
Neurosurgery=20
Research and Education<SUP> </SUP>Foundation with Funds from the =
American Brain=20
Tumour Association.<SUP> </SUP><A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#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>2</SUP> To whom requests for =
reprints=20
should be addressed, at Hospital<SUP> </SUP>for Sick Children, 555 =
University=20
Avenue, Toronto, Ontario,<SUP> </SUP>Canada, M5G 1X8. Phone: (416) =
813-6426;=20
Fax: (416) 813-4975;<SUP> </SUP>E-mail: <SPAN=20
id=3Dem0>peter.dirks{at}sickkids.ca</SPAN>
<SCRIPT type=3Dtext/javascript><!--=0A=
 var u =3D "peter.dirks", d =3D "sickkids.ca"; =
document.getElementById("em0").innerHTML =3D '<a href=3D"mailto:' + u + =
'@' + d + '">peter.dirks@sickkids.ca.<\/a>'//--></SCRIPT>
<SUP> </SUP><A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#RFN=
2"><IMG=20
height=3D12 alt=3DBack =
src=3D"http://cancerres.aacrjournals.org/icons/back.gif"=20
width=3D12 border=3D0></A>
<P><A name=3DFN3><!-- null --></A><SUP>3</SUP> The abbreviations used =
are: BTSC,=20
brain tumor stem cell; TSM,<SUP> </SUP>tumor sphere medium; EGF, =
epidermal=20
growth factor; bFGF, basic<SUP> </SUP>fibroblast growth factor; FBS, =
fetal=20
bovine serum; PDGFR, platelet-derived<SUP> </SUP>growth factor receptor; =
SKY,=20
spectral karyotyping; SFM, serum-free<SUP> </SUP>medium; GFAP, glial =
fibrillary=20
acidic protein.<SUP> </SUP><A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/63/18/5821#RFN=
3"><IMG=20
height=3D12 alt=3DBack =
src=3D"http://cancerres.aacrjournals.org/icons/back.gif"=20
width=3D12 border=3D0></A>
<P>Received 2/ 6/03. Revised 7/24/03. Accepted 7/29/03.
<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/63/18/5821#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/63/18/5821#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/63/18/5821#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/63/18/5821#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/63/18/5821#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/63/18/5821#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=
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  <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>
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    <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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page"=20
      src=3D"http://www.annalsnyas.org/portal_imgs/search_result.gif" =
width=3D59=20
      vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
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href=3D"http://www.annalsnyas.org/"><IMG=20
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src=3D"http://cancerres.aacrjournals.org/icons/shared/searchall/journals/=
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"=20
      width=3D49 vspace=3D5 border=3D0></A><BR><FONT =
face=3Dverdana,arial,helvetica=20
      size=3D-1>L. H. J. LOOIJENGA, AD. J. M. GILLIS, H. J. STOOP, R. =
HERSMUS, and=20
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href=3D"http://www.annalsnyas.org/cgi/reprint/1120/1/187">[PDF]</A> =
<BR><IMG=20
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src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif"=20
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width=3D5></TD></TR>
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    <TD colSpan=3D6>
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<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
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  <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
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width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
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page"=20
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      vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
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width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A =
href=3D"http://www.genesdev.org/"><IMG=20
      height=3D16 alt=3D"Genes Dev."=20
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src=3D"http://cancerres.aacrjournals.org/icons/shared/searchall/journals/=
genesdev.gif"=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>F. B. Furnari, T. Fenton, R. M. Bachoo, A. Mukasa, J. M. =
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<BR><IMG=20
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src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif"=20
      width=3D499> </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>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
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width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://bloodjournal.hematologylibrary.org/"><IMG =
height=3D80=20
      alt=3D"Home page"=20
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src=3D"http://bloodjournal.hematologylibrary.org/portal_imgs/search_resul=
t.gif"=20
      width=3D59 vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
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width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A=20
      href=3D"http://bloodjournal.hematologylibrary.org/"><IMG =
height=3D16 alt=3DBlood=20
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src=3D"http://cancerres.aacrjournals.org/icons/shared/searchall/journals/=
bloodjournal.gif"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
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      width=3D49 vspace=3D5 border=3D0></A><BR><FONT =
face=3Dverdana,arial,helvetica=20
      size=3D-1>L. Nilsson, P. Eden, E. Olsson, R. Mansson, I. =
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      Hellstrom-Lindberg, <EM>et al.</EM><BR><STRONG>The molecular =
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      syndromes</STRONG><BR>Blood, October&nbsp;15,&nbsp;2007; 110(8): =
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width=3D5></TD></TR>
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    <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>
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  <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
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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
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src=3D"http://cancerres.aacrjournals.org/icons/shared/searchall/journals/=
jnci.gif"=20
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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>R. P. Hill and R. Perris<BR><STRONG>"Destemming" Cancer =
Stem=20
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href=3D"http://jnci.oxfordjournals.org/cgi/reprint/99/19/1435">[PDF]</A> =

      <BR><IMG height=3D1 alt=3D""=20
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    <TD width=3D5><IMG height=3D5 alt=3D""=20
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width=3D5></TD></TR>
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      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
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<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
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  <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
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width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://cancerres.aacrjournals.org/"><IMG height=3D80 =
alt=3D"Home page"=20
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src=3D"http://cancerres.aacrjournals.org/portal_imgs/search_result.gif"=20
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    <TD width=3D5><IMG height=3D5 alt=3D""=20
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width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A=20
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alt=3D"Cancer Res."=20
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src=3D"http://cancerres.aacrjournals.org/icons/shared/searchall/journals/=
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      size=3D-1>J. N. Rich<BR><STRONG>Cancer Stem Cells in Radiation=20
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    <TD width=3D5><IMG height=3D5 alt=3D""=20
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width=3D5></TD></TR>
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    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
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width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
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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
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src=3D"http://annonc.oxfordjournals.org/portal_imgs/search_result.gif"=20
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    <TD width=3D5><IMG height=3D5 alt=3D""=20
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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
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src=3D"http://cancerres.aacrjournals.org/icons/shared/searchall/journals/=
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"=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 =
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    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
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width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
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    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://cancerres.aacrjournals.org/"><IMG height=3D80 =
alt=3D"Home page"=20
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src=3D"http://cancerres.aacrjournals.org/portal_imgs/search_result.gif"=20
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    <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
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src=3D"http://cancerres.aacrjournals.org/icons/shared/searchall/journals/=
canres.gif"=20
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src=3D"http://cancerres.aacrjournals.org/icons/shared/search/homelink.gif=
"=20
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face=3Dverdana,arial,helvetica=20
      size=3D-1>J. Faber and S. A. Armstrong<BR><STRONG>Mixed Lineage =
Leukemia=20
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      <BR><IMG height=3D1 alt=3D""=20
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width=3D499>=20
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    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
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      href=3D"http://cancerres.aacrjournals.org/"><IMG height=3D80 =
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src=3D"http://cancerres.aacrjournals.org/portal_imgs/search_result.gif"=20
      width=3D59 vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
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width=3D5></TD>
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src=3D"http://cancerres.aacrjournals.org/icons/shared/searchall/journals/=
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      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
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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>J. C. Liu, T. Deng, R. S. Lehal, J. Kim, and E.=20
      Zacksenhaus<BR><STRONG>Identification of Tumorsphere- and =
Tumor-Initiating=20
      Cells in HER2/Neu-Induced Mammary Tumors</STRONG><BR>Cancer Res.,=20
      September&nbsp;15,&nbsp;2007; 67(18): 8671 - 8681. <BR><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/abstract/67/18/8671=
">[Abstract]</A>=20
      <A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/67/18/8671">[F=
ull=20
      Text]</A> <A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/reprint/67/18/8671">[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>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
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/abstract/67/17/8216=
">[Abstract]</A>=20
      <A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/67/17/8216">[F=
ull=20
      Text]</A> <A=20
      =
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://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>U. Ganapati, H. T. Tan, M. Lynch, M. Dolezal, S. de Vos, =
and J. C.=20
      Gasson<BR><STRONG>Modeling Notch Signaling in Normal and =
Neoplastic=20
      Hematopoiesis: Global Gene Expression Profiling in Response to =
Activated=20
      Notch Expression</STRONG><BR>Stem Cells, August&nbsp;1,&nbsp;2007; =
25(8):=20
      1872 - 1880. <BR><A=20
      =
href=3D"http://stemcells.alphamedpress.org/cgi/content/abstract/25/8/1872=
">[Abstract]</A>=20
      <A=20
      =
href=3D"http://stemcells.alphamedpress.org/cgi/content/full/25/8/1872">[F=
ull=20
      Text]</A> <A=20
      =
href=3D"http://stemcells.alphamedpress.org/cgi/reprint/25/8/1872">[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://glycob.oxfordjournals.org/"><IMG height=3D80 =
alt=3D"Home page"=20
      =
src=3D"http://glycob.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://glycob.oxfordjournals.org/"><IMG height=3D16 =
alt=3DGlycobiology=20
      =
src=3D"http://cancerres.aacrjournals.org/icons/shared/searchall/journals/=
glycob.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. Yanagisawa and R. K Yu<BR><STRONG>The expression and =
functions=20
      of glycoconjugates in neural stem cells</STRONG><BR>Glycobiology,=20
      July&nbsp;1,&nbsp;2007; 17(7): 57R - 74R. <BR><A=20
      =
href=3D"http://glycob.oxfordjournals.org/cgi/content/abstract/17/7/57R">[=
Abstract]</A>=20
      <A =
href=3D"http://glycob.oxfordjournals.org/cgi/content/full/17/7/57R">[Full=
=20
      Text]</A> <A=20
      =
href=3D"http://glycob.oxfordjournals.org/cgi/reprint/17/7/57R">[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://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>A. J. Ghods, D. Irvin, G. Liu, X. Yuan, I. R. =
Abdulkadir, P.=20
      Tunici, B. Konda, S. Wachsmann-Hogiu, K. L. Black, and J. S.=20
      Yu<BR><STRONG>Spheres Isolated from 9L Gliosarcoma Rat Cell Line =
Possess=20
      Chemoresistant and Aggressive Cancer Stem-Like =
Cells</STRONG><BR>Stem=20
      Cells, July&nbsp;1,&nbsp;2007; 25(7): 1645 - 1653. <BR><A=20
      =
href=3D"http://stemcells.alphamedpress.org/cgi/content/abstract/25/7/1645=
">[Abstract]</A>=20
      <A=20
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href=3D"http://stemcells.alphamedpress.org/cgi/content/full/25/7/1645">[F=
ull=20
      Text]</A> <A=20
      =
href=3D"http://stemcells.alphamedpress.org/cgi/reprint/25/7/1645">[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>C. V. Pfenninger, T. Roschupkina, F. Hertwig, D. =
Kottwitz, E.=20
      Englund, J. Bengzon, S. E. Jacobsen, and U. A. =
Nuber<BR><STRONG>CD133 Is=20
      Not Present on Neurogenic Astrocytes in the Adult Subventricular =
Zone, but=20
      on Embryonic Neural Stem Cells, Ependymal Cells, and Glioblastoma=20
      Cells</STRONG><BR>Cancer Res., June&nbsp;15,&nbsp;2007; 67(12): =
5727 -=20
      5736. <BR><A=20
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href=3D"http://cancerres.aacrjournals.org/cgi/content/abstract/67/12/5727=
">[Abstract]</A>=20
      <A=20
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href=3D"http://cancerres.aacrjournals.org/cgi/content/full/67/12/5727">[F=
ull=20
      Text]</A> <A=20
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href=3D"http://cancerres.aacrjournals.org/cgi/reprint/67/12/5727">[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>D. Beier, P. Hau, M. Proescholdt, A. Lohmeier, J. =
Wischhusen, P.=20
      J. Oefner, L. Aigner, A. Brawanski, U. Bogdahn, and C. P.=20
      Beier<BR><STRONG>CD133+ and CD133- Glioblastoma-Derived Cancer =
Stem Cells=20
      Show Differential Growth Characteristics and Molecular=20
      Profiles</STRONG><BR>Cancer Res., May&nbsp;1,&nbsp;2007; 67(9): =
4010 -=20
      4015. <BR><A=20
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href=3D"http://cancerres.aacrjournals.org/cgi/content/abstract/67/9/4010"=
>[Abstract]</A>=20
      <A=20
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href=3D"http://cancerres.aacrjournals.org/cgi/content/full/67/9/4010">[Fu=
ll=20
      Text]</A> <A=20
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href=3D"http://cancerres.aacrjournals.org/cgi/reprint/67/9/4010">[PDF]</A=
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      <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://humrep.oxfordjournals.org/"><IMG height=3D80 =
alt=3D"Home page"=20
      =
src=3D"http://humrep.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://humrep.oxfordjournals.org/"><IMG height=3D16 =
alt=3D"Hum Reprod"=20
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src=3D"http://cancerres.aacrjournals.org/icons/shared/searchall/journals/=
humrep.gif"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
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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>K. Kato, M. Yoshimoto, K. Kato, S. Adachi, A. Yamayoshi, =
T. Arima,=20
      K. Asanoma, S. Kyo, T. Nakahata, and N. =
Wake<BR><STRONG>Characterization=20
      of side-population cells in human normal =
endometrium</STRONG><BR>Hum.=20
      Reprod., May&nbsp;1,&nbsp;2007; 22(5): 1214 - 1223. <BR><A=20
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href=3D"http://humrep.oxfordjournals.org/cgi/content/abstract/22/5/1214">=
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      <A=20
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href=3D"http://humrep.oxfordjournals.org/cgi/content/full/22/5/1214">[Ful=
l=20
      Text]</A> <A=20
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href=3D"http://humrep.oxfordjournals.org/cgi/reprint/22/5/1214">[PDF]</A>=
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      <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
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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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width=3D5></TD>
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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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    <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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    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
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      <BR><IMG height=3D1 alt=3D""=20
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    <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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      size=3D-1>K. Chaichana, G. Zamora-Berridi, J. Camara-Quintana, and =
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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=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A =
href=3D"http://dev.biologists.org/"><IMG=20
      height=3D16 alt=3DDevelopment=20
      =
src=3D"http://cancerres.aacrjournals.org/icons/shared/searchall/journals/=
develop.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>J. Pogoriler, K. Millen, M. Utset, and W. =
Du<BR><STRONG>Loss of=20
      cyclin D1 impairs cerebellar development and suppresses =
medulloblastoma=20
      formation</STRONG><BR>Development, October&nbsp;1,&nbsp;2006; =
133(19):=20
      3929 - 3937. <BR><A=20
      =
href=3D"http://dev.biologists.org/cgi/content/abstract/133/19/3929">[Abst=
ract]</A>=20
      <A =
href=3D"http://dev.biologists.org/cgi/content/full/133/19/3929">[Full=20
      Text]</A> <A=20
      =
href=3D"http://dev.biologists.org/cgi/reprint/133/19/3929">[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://content.nejm.org/"><IMG height=3D80 alt=3D"Home =
page"=20
      src=3D"http://content.nejm.org/portal_imgs/search_result.gif" =
width=3D59=20
      vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A =
href=3D"http://content.nejm.org/"><IMG=20
      height=3D16 alt=3DNEJM=20
      =
src=3D"http://cancerres.aacrjournals.org/icons/shared/searchall/journals/=
nejm.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>C. T. Jordan, M. L. Guzman, and M. =
Noble<BR><STRONG>Cancer stem=20
      cells.</STRONG><BR>N. Engl. J. Med., September&nbsp;21,&nbsp;2006; =

      355(12): 1253 - 1261. <BR><A=20
      =
href=3D"http://content.nejm.org/cgi/content/full/355/12/1253">[Full=20
      Text]</A> <A=20
      href=3D"http://content.nejm.org/cgi/reprint/355/12/1253">[PDF]</A> =
<BR><IMG=20
      height=3D1 alt=3D"" =
src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif"=20
      width=3D499> </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. Balenci, I. D. Clarke, P. B. Dirks, N. Assard, F. =
Ducray, A.=20
      Jouvet, M.-F. Belin, J. Honnorat, and J. Baudier<BR><STRONG>IQGAP1 =
Protein=20
      Specifies Amplifying Cancer Cells in Glioblastoma=20
      Multiforme.</STRONG><BR>Cancer Res., September&nbsp;15,&nbsp;2006; =
66(18):=20
      9074 - 9082. <BR><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/abstract/66/18/9074=
">[Abstract]</A>=20
      <A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074">[F=
ull=20
      Text]</A> <A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/reprint/66/18/9074">[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>S. Bao, Q. Wu, S. Sathornsumetee, Y. Hao, Z. Li, A. B. =
Hjelmeland,=20
      Q. Shi, R. E. McLendon, D. D. Bigner, and J. N. =
Rich<BR><STRONG>Stem=20
      Cell-like Glioma Cells Promote Tumor Angiogenesis through Vascular =

      Endothelial Growth Factor</STRONG><BR>Cancer Res.,=20
      August&nbsp;15,&nbsp;2006; 66(16): 7843 - 7848. <BR><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/abstract/66/16/7843=
">[Abstract]</A>=20
      <A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/16/7843">[F=
ull=20
      Text]</A> <A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/reprint/66/16/7843">[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>A. Erlandsson, K. Brannvall, S. Gustafsdottir, B. =
Westermark, and=20
      K. Forsberg-Nilsson<BR><STRONG>Autocrine/Paracrine =
Platelet-Derived Growth=20
      Factor Regulates Proliferation of Neural Progenitor=20
      Cells</STRONG><BR>Cancer Res., August&nbsp;15,&nbsp;2006; 66(16): =
8042 -=20
      8048. <BR><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/abstract/66/16/8042=
">[Abstract]</A>=20
      <A=20
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href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/16/8042">[F=
ull=20
      Text]</A> <A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/reprint/66/16/8042">[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://clincancerres.aacrjournals.org/"><IMG height=3D80=20
      alt=3D"Home page"=20
      =
src=3D"http://clincancerres.aacrjournals.org/portal_imgs/search_result.gi=
f"=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://clincancerres.aacrjournals.org/"><IMG height=3D16=20
      alt=3D"Clin. Cancer Res."=20
      =
src=3D"http://cancerres.aacrjournals.org/icons/shared/searchall/journals/=
clincanres.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>N. Mehra, M. Penning, J. Maas, L. V. Beerepoot, N. van =
Daal, C. H.=20
      van Gils, R. H. Giles, and E. E. Voest<BR><STRONG>Progenitor =
Marker CD133=20
      mRNA Is Elevated in Peripheral Blood of Cancer Patients with Bone=20
      Metastases.</STRONG><BR>Clin. Cancer Res., =
August&nbsp;15,&nbsp;2006;=20
      12(16): 4859 - 4866. <BR><A=20
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href=3D"http://clincancerres.aacrjournals.org/cgi/content/abstract/12/16/=
4859">[Abstract]</A>=20
      <A=20
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href=3D"http://clincancerres.aacrjournals.org/cgi/content/full/12/16/4859=
">[Full=20
      Text]</A> <A=20
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href=3D"http://clincancerres.aacrjournals.org/cgi/reprint/12/16/4859">[PD=
F]</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>X. Fan, W. Matsui, L. Khaki, D. Stearns, J. Chun, Y.-M. =
Li, and C.=20
      G. Eberhart<BR><STRONG>Notch Pathway Inhibition Depletes Stem-like =
Cells=20
      and Blocks Engraftment in Embryonal Brain =
Tumors.</STRONG><BR>Cancer Res.,=20
      August&nbsp;1,&nbsp;2006; 66(15): 7445 - 7452. <BR><A=20
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href=3D"http://cancerres.aacrjournals.org/cgi/content/abstract/66/15/7445=
">[Abstract]</A>=20
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href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/15/7445">[F=
ull=20
      Text]</A> <A=20
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href=3D"http://cancerres.aacrjournals.org/cgi/reprint/66/15/7445">[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://www.jneurosci.org/"><IMG height=3D80 alt=3D"Home =
page"=20
      src=3D"http://www.jneurosci.org/portal_imgs/search_result.gif" =
width=3D59=20
      vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A =
href=3D"http://www.jneurosci.org/"><IMG=20
      height=3D16 alt=3D"J. Neurosci."=20
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src=3D"http://cancerres.aacrjournals.org/icons/shared/searchall/journals/=
jneuro.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>M. Assanah, R. Lochhead, A. Ogden, J. Bruce, J. Goldman, =
and P.=20
      Canoll<BR><STRONG>Glial progenitors in adult white matter are =
driven to=20
      form malignant gliomas by platelet-derived growth =
factor-expressing=20
      retroviruses.</STRONG><BR>J. Neurosci., June&nbsp;21,&nbsp;2006; =
26(25):=20
      6781 - 6790. <BR><A=20
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href=3D"http://www.jneurosci.org/cgi/content/abstract/26/25/6781">[Abstra=
ct]</A>=20
      <A =
href=3D"http://www.jneurosci.org/cgi/content/full/26/25/6781">[Full=20
      Text]</A> <A=20
      href=3D"http://www.jneurosci.org/cgi/reprint/26/25/6781">[PDF]</A> =
<BR><IMG=20
      height=3D1 alt=3D"" =
src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif"=20
      width=3D499> </FONT></TD>
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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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    <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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width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=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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      Norris, R. Polakiewicz, E. M. Wexler, M. V. Sofroniew, H. I. =
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    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
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width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
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ull=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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    <TD width=3D5><IMG height=3D5 alt=3D""=20
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alt=3D"Cancer Res."=20
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src=3D"http://cancerres.aacrjournals.org/icons/shared/searchall/journals/=
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    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
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width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
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width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
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alt=3D"Stem Cells"=20
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src=3D"http://cancerres.aacrjournals.org/icons/shared/searchall/journals/=
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    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
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    <TD width=3D5><IMG height=3D5 alt=3D""=20
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width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
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src=3D"http://cancerres.aacrjournals.org/icons/shared/searchall/journals/=
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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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      vspace=3D5 border=3D1></A><BR></TD>
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    <TD width=3D5><IMG height=3D5 alt=3D""=20
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    <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>
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    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
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width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
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width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
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    <TD width=3D5><IMG height=3D5 alt=3D""=20
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width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A=20
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"=20
      width=3D49 vspace=3D5 border=3D0></A><BR><FONT =
face=3Dverdana,arial,helvetica=20
      size=3D-1>L. Patrawala, T. Calhoun, R. Schneider-Broussard, J. =
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      Claypool, and D. G. Tang<BR><STRONG>Side Population Is Enriched in =

      Tumorigenic, Stem-Like Cancer Cells, whereas ABCG2+ and ABCG2- =
Cancer=20
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      July&nbsp;15,&nbsp;2005; 65(14): 6207 - 6219. <BR><A=20
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    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D5></TD></TR>
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    <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>
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  <TR bgColor=3D#d9d4c5>
    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
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width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
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width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
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src=3D"http://cancerres.aacrjournals.org/portal_imgs/search_result.gif"=20
      width=3D59 vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
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width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A=20
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"=20
      width=3D49 vspace=3D5 border=3D0></A><BR><FONT =
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      size=3D-1>D. Ponti, A. Costa, N. Zaffaroni, G. Pratesi, G. =
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      Coradini, S. Pilotti, M. A. Pierotti, and M. G.=20
      Daidone<BR><STRONG>Isolation and In vitro Propagation of =
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    <TD width=3D5><IMG height=3D5 alt=3D""=20
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width=3D5></TD></TR>
  <TR>
    <TD colSpan=3D6>
      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
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<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
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  <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
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width=3D5></TD>
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    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D5></TD>
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      Lucas, Y. Kanda, and J. Huard<BR><STRONG>Long-Term Self-Renewal of =

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width=3D5></TD></TR>
  <TR>
    <TD colSpan=3D6>
      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
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<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
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  <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
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      vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><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 width=3D5><IMG height=3D5 alt=3D""=20
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width=3D5></TD>
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src=3D"http://cancerres.aacrjournals.org/icons/shared/searchall/journals/=
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      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
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face=3Dverdana,arial,helvetica=20
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      <BR><IMG height=3D1 alt=3D""=20
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    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D5></TD></TR>
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<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
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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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width=3D5></TD>
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alt=3D"Cancer Res."=20
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      size=3D-1>G. Cronwright, K. Le Blanc, C. Gotherstrom, P. Darcy, M. =
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<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
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    <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
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src=3D"http://cancerres.aacrjournals.org/icons/shared/search/homelink.gif=
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face=3Dverdana,arial,helvetica=20
      size=3D-1>R. Glass, M. Synowitz, G. Kronenberg, J.-H. Walzlein, D. =
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    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
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width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
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width=3D5></TD>
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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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      <BR><IMG height=3D1 alt=3D""=20
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    <TD vAlign=3Dtop noWrap width=3D499><A =
href=3D"http://www.jimmunol.org/"><IMG=20
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      =
src=3D"http://cancerres.aacrjournals.org/icons/shared/searchall/journals/=
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      Effectors and Reconstituting Host Cells after Sequential =
Lymphodepletion=20
      and Adoptive Immunotherapy</STRONG><BR>J. Immunol.,=20
      March&nbsp;15,&nbsp;2004; 172(6): 3462 - 3468. <BR><A=20
      =
href=3D"http://www.jimmunol.org/cgi/content/abstract/172/6/3462">[Abstrac=
t]</A>=20
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      H. Geschwind, M. Bronner-Fraser, and H. I. =
Kornblum<BR><STRONG>Cancerous=20
      stem cells can arise from pediatric brain tumors</STRONG><BR>PNAS, =

      December&nbsp;9,&nbsp;2003; 100(25): 15178 - 15183. <BR><A=20
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href=3D"http://www.pnas.org/cgi/content/abstract/100/25/15178">[Abstract]=
</A>=20
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BACKGROUND-COLOR: #cccccc; TEXT-ALIGN: right
}
DIV.ac_region .left_top_nowrap {
	VERTICAL-ALIGN: top; WHITE-SPACE: nowrap; TEXT-ALIGN: left
}
DIV.ac_region .right_top_nowrap {
	VERTICAL-ALIGN: top; WHITE-SPACE: nowrap; TEXT-ALIGN: right
}
DIV.ac_region TABLE.nowrap {
	WHITE-SPACE: nowrap
}
DIV.ac_region .hw_ac_subnote {
	FONT-SIZE: small
}
DIV.ac_region .error {
=09
}
DIV.ac_region .hw_ac_error {
=09
}
DIV.ac_region .admin_contact_information {
	WIDTH: 600px; WHITE-SPACE: nowrap
}
DIV.ac_region .contact_pub_for_change {
	FONT-SIZE: 80%; WHITE-SPACE: nowrap; BACKGROUND-COLOR: #e1e1e1; =
TEXT-ALIGN: center
}
DIV.ac_region .hw_ac_small {
	FONT-SIZE: 80%
}
DIV.ac_region .hw_ac_smaller {
	FONT-SIZE: 80%
}
DIV.ac_region #hw_ac_activation_form #hw_ac_self_activation {
	BORDER-RIGHT: #9d9d9d 5px solid; BORDER-TOP: #e0e0e0 5px solid; =
BORDER-LEFT: #e0e0e0 5px solid; BORDER-BOTTOM: #9d9d9d 5px solid
}
DIV.ac_region #hw_ac_activation_form #hw_ac_self_activation TABLE {
	BORDER-RIGHT: thin solid; BORDER-TOP: thin solid; BORDER-LEFT: thin =
solid; BORDER-BOTTOM: thin solid
}
DIV.ac_region #hw_ac_activation_form #hw_ac_self_activation TABLE TH {
	TEXT-ALIGN: center
}
DIV.ac_region #hw_ac_activation_form TABLE TH {
	BACKGROUND-COLOR: #cccccc; TEXT-ALIGN: right
}
DIV.ac_region #hw_ac_activation_form TABLE TD {
	TEXT-ALIGN: left
}
DIV.ac_region #hw_ac_activation_form .hw_ac_important {
	COLOR: #a70716
}
DIV.ac_region #hw_ac_activation_form TABLE {
=09
}
DIV.ac_region #hw_ac_activation_form FIELDSET {
	PADDING-RIGHT: 0px; PADDING-LEFT: 0px; PADDING-BOTTOM: 0px; MARGIN: =
0px; BORDER-TOP-STYLE: none; PADDING-TOP: 0px; BORDER-RIGHT-STYLE: none; =
BORDER-LEFT-STYLE: none; BORDER-BOTTOM-STYLE: none
}
DIV.ac_region #hw_ac_activation_form FIELDSET LEGEND {
	DISPLAY: none
}

------=_NextPart_000_0000_01C856A0.287EBDD0
Content-Type: application/octet-stream
Content-Transfer-Encoding: quoted-printable
Content-Location: http://cancerres.aacrjournals.org/javascript/ajax/xmlhttprequest.js

/*=0A=
=0A=
Cross-Browser XMLHttpRequest v1.2=0A=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=0A=
=0A=
Emulate Gecko 'XMLHttpRequest()' functionality in IE and Opera. Opera =
requires=0A=
the Sun Java Runtime Environment <http://www.java.com/>.=0A=
=0A=
by Andrew Gregory=0A=
http://www.scss.com.au/family/andrew/webdesign/xmlhttprequest/=0A=
=0A=
This work is licensed under the Creative Commons Attribution License. To =
view a=0A=
copy of this license, visit =
http://creativecommons.org/licenses/by-sa/2.5/ or=0A=
send a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, =
California=0A=
94305, USA.=0A=
=0A=
Attribution: Leave my name and web address in this script intact.=0A=
=0A=
Not Supported in Opera=0A=
----------------------=0A=
* user/password authentication=0A=
* responseXML data member=0A=
=0A=
Not Fully Supported in Opera=0A=
----------------------------=0A=
* async requests=0A=
* abort()=0A=
* getAllResponseHeaders(), getAllResponseHeader(header)=0A=
=0A=
*/=0A=
// IE support=0A=
if (window.ActiveXObject && !window.XMLHttpRequest) {=0A=
  window.XMLHttpRequest =3D function() {=0A=
    var msxmls =3D new Array(=0A=
      'Msxml2.XMLHTTP.5.0',=0A=
      'Msxml2.XMLHTTP.4.0',=0A=
      'Msxml2.XMLHTTP.3.0',=0A=
      'Msxml2.XMLHTTP',=0A=
      'Microsoft.XMLHTTP');=0A=
    for (var i =3D 0; i < msxmls.length; i++) {=0A=
      try {=0A=
        return new ActiveXObject(msxmls[i]);=0A=
      } catch (e) {=0A=
      }=0A=
    }=0A=
    return null;=0A=
  };=0A=
}=0A=
// Gecko support=0A=
/* ;-) */=0A=
// Opera support=0A=
if (window.opera && !window.XMLHttpRequest) {=0A=
  window.XMLHttpRequest =3D function() {=0A=
    this.readyState =3D 0; // =
0=3Duninitialized,1=3Dloading,2=3Dloaded,3=3Dinteractive,4=3Dcomplete=0A=
    this.status =3D 0; // HTTP status codes=0A=
    this.statusText =3D '';=0A=
    this._headers =3D [];=0A=
    this._aborted =3D false;=0A=
    this._async =3D true;=0A=
    this._defaultCharset =3D 'ISO-8859-1';=0A=
    this._getCharset =3D function() {=0A=
      var charset =3D _defaultCharset;=0A=
      var contentType =3D =
this.getResponseHeader('Content-type').toUpperCase();=0A=
      val =3D contentType.indexOf('CHARSET=3D');=0A=
      if (val !=3D -1) {=0A=
        charset =3D contentType.substring(val);=0A=
      }=0A=
      val =3D charset.indexOf(';');=0A=
      if (val !=3D -1) {=0A=
        charset =3D charset.substring(0, val);=0A=
      }=0A=
      val =3D charset.indexOf(',');=0A=
      if (val !=3D -1) {=0A=
        charset =3D charset.substring(0, val);=0A=
      }=0A=
      return charset;=0A=
    };=0A=
    this.abort =3D function() {=0A=
      this._aborted =3D true;=0A=
    };=0A=
    this.getAllResponseHeaders =3D function() {=0A=
      return this.getAllResponseHeader('*');=0A=
    };=0A=
    this.getAllResponseHeader =3D function(header) {=0A=
      var ret =3D '';=0A=
      for (var i =3D 0; i < this._headers.length; i++) {=0A=
        if (header =3D=3D '*' || this._headers[i].h =3D=3D header) {=0A=
          ret +=3D this._headers[i].h + ': ' + this._headers[i].v + '\n';=0A=
        }=0A=
      }=0A=
      return ret;=0A=
    };=0A=
    this.getResponseHeader =3D function(header) {=0A=
      var ret =3D getAllResponseHeader(header);=0A=
      var i =3D ret.indexOf('\n');=0A=
      if (i !=3D -1) {=0A=
        ret =3D ret.substring(0, i);=0A=
      }=0A=
      return ret;=0A=
    };=0A=
    this.setRequestHeader =3D function(header, value) {=0A=
      this._headers[this._headers.length] =3D {h:header, v:value};=0A=
    };=0A=
    this.open =3D function(method, url, async, user, password) {=0A=
      this.method =3D method;=0A=
      this.url =3D url;=0A=
      this._async =3D true;=0A=
      this._aborted =3D false;=0A=
      this._headers =3D [];=0A=
      if (arguments.length >=3D 3) {=0A=
        this._async =3D async;=0A=
      }=0A=
      if (arguments.length > 3) {=0A=
        opera.postError('XMLHttpRequest.open() - user/password not =
supported');=0A=
      }=0A=
      this.readyState =3D 1;=0A=
      if (this.onreadystatechange) {=0A=
        this.onreadystatechange();=0A=
      }=0A=
    };=0A=
    this.send =3D function(data) {=0A=
      if (!navigator.javaEnabled()) {=0A=
        alert("XMLHttpRequest.send() - Java must be installed and =
enabled.");=0A=
        return;=0A=
      }=0A=
      if (this._async) {=0A=
        setTimeout(this._sendasync, 0, this, data);=0A=
        // this is not really asynchronous and won't execute until the =
current=0A=
        // execution context ends=0A=
      } else {=0A=
        this._sendsync(data);=0A=
      }=0A=
    }=0A=
    this._sendasync =3D function(req, data) {=0A=
      if (!req._aborted) {=0A=
        req._sendsync(data);=0A=
      }=0A=
    };=0A=
    this._sendsync =3D function(data) {=0A=
      this.readyState =3D 2;=0A=
      if (this.onreadystatechange) {=0A=
        this.onreadystatechange();=0A=
      }=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_0000_01C856A0.287EBDD0
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=
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------=_NextPart_000_0000_01C856A0.287EBDD0
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=
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 * Entrez Linking callback to populate content box.=0A=
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 * 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=
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  if (navigator) {=0A=
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  /*=0A=
   * Acquire table row element to update, initiate callback=0A=
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------=_NextPart_000_0000_01C856A0.287EBDD0
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=
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//-- 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 =
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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=
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//-- 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=
//_uRno[0]=3D".urchin.com";=0A=
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//-- **** Don't modify below this point ***=0A=
var =
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var _ugifpath2=3D"http://www.google-analytics.com/__utm.gif";=0A=
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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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 var nx=3D" expires=3D"+_uNx()+";";=0A=
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 if (!_uVG()) return;=0A=
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 _udt=3Dnew Date();=0A=
 _ust=3DMath.round(_udt.getTime()/1000);=0A=
 a=3Ddc.indexOf("__utma=3D"+_udh);=0A=
 b=3Ddc.indexOf("__utmb=3D"+_udh);=0A=
 c=3Ddc.indexOf("__utmc=3D"+_udh);=0A=
 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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 }=0A=
 if (_ulink) {=0A=
  if (_uanchor && _udlh && _udlh!=3D"") s=3D_udlh+"&";=0A=
  s+=3D_udl.search;=0A=
  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=
   if (!(_uIN(c=3D_uGC(s,"__utmc=3D","&")))) c=3D"-";=0A=
   v=3D_uGC(s,"__utmv=3D","&");=0A=
   z=3D_uGC(s,"__utmz=3D","&");=0A=
   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))) =
{_ubl=3D1;a=3D"-";b=3D"-";c=3D"-";xx=3D"-";z=3D"-";v=3D"-";}=0A=
   if (a!=3D"-" && b!=3D"-" && c!=3D"-") f=3D1;=0A=
   else if(a!=3D"-") f=3D2;=0A=
  }=0A=
 }=0A=
 if(f=3D=3D1) {=0A=
  _ubd.cookie=3D"__utma=3D"+a+"; path=3D"+_utcp+";"+nx+_udo;=0A=
  _ubd.cookie=3D"__utmb=3D"+b+"; path=3D"+_utcp+";"+x+_udo;=0A=
  _ubd.cookie=3D"__utmc=3D"+c+"; path=3D"+_utcp+";"+_udo;=0A=
 } else if (f=3D=3D2) {=0A=
  a=3D_uFixA(s,"&",_ust);=0A=
  _ubd.cookie=3D"__utma=3D"+a+"; path=3D"+_utcp+";"+nx+_udo;=0A=
  _ubd.cookie=3D"__utmb=3D"+_udh+"; path=3D"+_utcp+";"+x+_udo;=0A=
  _ubd.cookie=3D"__utmc=3D"+_udh+"; path=3D"+_utcp+";"+_udo;=0A=
  _ufns=3D1;=0A=
 } else if (a>=3D0 && b>=3D0 && c>=3D0) {=0A=
  _ubd.cookie=3D"__utmb=3D"+_udh+"; path=3D"+_utcp+";"+x+_udo;=0A=
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  if (a>=3D0) a=3D_uFixA(_ubd.cookie,";",_ust);=0A=
  else a=3D_udh+"."+_uu+"."+_ust+"."+_ust+"."+_ust+".1";=0A=
  _ubd.cookie=3D"__utma=3D"+a+"; path=3D"+_utcp+";"+nx+_udo;=0A=
  _ubd.cookie=3D"__utmb=3D"+_udh+"; path=3D"+_utcp+";"+x+_udo;=0A=
  _ubd.cookie=3D"__utmc=3D"+_udh+"; path=3D"+_utcp+";"+_udo;=0A=
  _ufns=3D1;=0A=
 }=0A=
 if (_ulink && xx && xx!=3D"" && xx!=3D"-") {=0A=
   xx=3D_uUES(xx);=0A=
   if (xx.indexOf(";")=3D=3D-1) _ubd.cookie=3D"__utmx=3D"+xx+"; =
path=3D"+_utcp+";"+nx+_udo;=0A=
 }=0A=
 if (_ulink && v && v!=3D"" && v!=3D"-") {=0A=
  v=3D_uUES(v);=0A=
  if (v.indexOf(";")=3D=3D-1) _ubd.cookie=3D"__utmv=3D"+v+"; =
path=3D"+_utcp+";"+nx+_udo;=0A=
 }=0A=
 _uInfo(page);=0A=
 _ufns=3D0;=0A=
 _ufno=3D0;=0A=
 if (!page || page=3D=3D"") _uff=3D1;=0A=
}=0A=
function _uInfo(page) {=0A=
 var p,s=3D"",dm=3D"",pg=3D_udl.pathname+_udl.search;=0A=
 if (page && page!=3D"") pg=3D_uES(page,1);=0A=
 _ur=3D_ubd.referrer;=0A=
 if (!_ur || _ur=3D=3D"") { _ur=3D"-"; }=0A=
 else {=0A=
  dm=3D_ubd.domain;=0A=
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  p=3D_ur.indexOf(dm);=0A=
  if ((p>=3D0) && (p<=3D8)) { _ur=3D"0"; }=0A=
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_ur.lastIndexOf("]")=3D=3D(_ur.length-1)) { _ur=3D"-"; }=0A=
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 s+=3D"&utmn=3D"+_uu;=0A=
 if (_ufsc) s+=3D_uBInfo();=0A=
 if (_uctm) s+=3D_uCInfo();=0A=
 if (_utitle && _ubd.title && _ubd.title!=3D"") =
s+=3D"&utmdt=3D"+_uES(_ubd.title);=0A=
 if (_udl.hostname && _udl.hostname!=3D"") =
s+=3D"&utmhn=3D"+_uES(_udl.hostname);=0A=
 s+=3D"&utmr=3D"+_ur;=0A=
 s+=3D"&utmp=3D"+pg;=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=
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 return;=0A=
}=0A=
function _uVoid() { return; }=0A=
function _uCInfo() {=0A=
 if (!_ucto || _ucto=3D=3D"") { _ucto=3D"15768000"; }=0A=
 if (!_uVG()) return;=0A=
 var =
c=3D"",t=3D"-",t2=3D"-",t3=3D"-",o=3D0,cs=3D0,cn=3D0,i=3D0,z=3D"-",s=3D""=
;=0A=
 if (_uanchor && _udlh && _udlh!=3D"") s=3D_udlh+"&";=0A=
 s+=3D_udl.search;=0A=
 var x=3Dnew Date(_udt.getTime()+(_ucto*1000));=0A=
 var dc=3D_ubd.cookie;=0A=
 x=3D" expires=3D"+x.toGMTString()+";";=0A=
 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=
 }=0A=
 z=3Ddc.indexOf("__utmz=3D"+_udh);=0A=
 if (z>-1) { z=3D_uGC(dc,"__utmz=3D"+_udh,";"); }=0A=
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 t2=3D_uGC(s,_ucsr+"=3D","&");=0A=
 t3=3D_uGC(s,"gclid=3D","&");=0A=
 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=
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  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=
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  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=
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 }=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=
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  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=
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p=3D"__utma=3D"+a+"&__utmb=3D"+b+"&__utmc=3D"+c+"&__utmx=3D"+x+"&__utmz=3D=
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   else if (iq=3D=3D-1) =
_udl.href=3Dl.substring(0,ih-1)+"?"+p+l.substring(ih);=0A=
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}=0A=
function __utmLinkPost(f,h) {=0A=
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  z=3D_uES(_uGC(dc,"__utmz=3D"+_udh,";"));=0A=
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p=3D"__utma=3D"+a+"&__utmb=3D"+b+"&__utmc=3D"+c+"&__utmx=3D"+x+"&__utmz=3D=
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f.action=3Df.action.substring(0,ih-1)+"?"+p+f.action.substring(ih);=0A=
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f.action=3Df.action.substring(0,ih-1)+"&"+p+f.action.substring(ih);=0A=
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}=0A=
function __utmSetVar(v) {=0A=
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i2.src=3D_ugifpath2+"?"+"utmwv=3D"+_uwv+s+"&utmac=3D"+_uacct+"&utmcc=3D"+=
_uGCS();=0A=
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}=0A=
function _uGCS() {=0A=
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 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=
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}=0A=
function _uGC(l,n,s) {=0A=
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 var i,i2,i3,c=3D"-";=0A=
 i=3Dl.indexOf(n);=0A=
 i3=3Dn.indexOf("=3D")+1;=0A=
 if (i > -1) {=0A=
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}=0A=
function _uDomain() {=0A=
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 if (_udn=3D=3D"auto") {=0A=
  var d=3D_ubd.domain;=0A=
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 return _uHash(_udn);=0A=
}=0A=
function _uHash(d) {=0A=
 if (!d || d=3D=3D"") return 1;=0A=
 var h=3D0,g=3D0;=0A=
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}=0A=
function _uFixA(c,s,t) {=0A=
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 var lt=3D0,i=3D0;=0A=
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  _uns=3D(_uns*1)+1;=0A=
  a=3Da.substring(0,i);=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=
 var a=3D_uGC(_ubd.cookie,"__utma=3D"+_udh,";");=0A=
 if ((i=3Da.indexOf(".",0))<0) return;=0A=
 if ((i2=3Da.indexOf(".",i+1))>0) r=3Da.substring(i+1,i2); else return =
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 if ((i=3Da.indexOf(".",i2+1))>0) t=3Da.substring(i2+1,i); else return =
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 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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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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 }=0A=
}=0A=
function _uIN(n) {=0A=
 if (!n) return false;=0A=
 for (var i=3D0;i<n.length;i++) {=0A=
  var c=3Dn.charAt(i);=0A=
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}=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=
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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=
 if (!_utk || _utk=3D=3D"" || _utk.length<10) return;=0A=
 var d=3D'www.google.com';=0A=
 if (_utk.charAt(0)=3D=3D'!') d=3D'analytics.corp.google.com';=0A=
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 var sc=3Ddocument.createElement('script');=0A=
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 sc.id=3D"_gasojs";=0A=
 =
sc.src=3D'https://'+d+'/analytics/reporting/overlay_js?gaso=3D'+_utk+'&'+=
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function _uGT() {=0A=
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 if (h && h!=3D"" && h.indexOf("#gaso=3D")=3D=3D0) {=0A=
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 return a;=0A=
}=0A=
var _utk=3D_uGT();=0A=
if (_utk && _utk!=3D"" && _utk.length>10) {=0A=
 if (window.addEventListener) {=0A=
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 }=0A=
}=0A=
=0A=
function _uNx() {=0A=
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}=0A=

------=_NextPart_000_0000_01C856A0.287EBDD0--

