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Subject: IQGAP1 Protein Specifies Amplifying Cancer Cells in Glioblastoma Multiforme -- Balenci et al. 66 (18): 9074 -- Cancer Research
Date: Tue, 15 Jan 2008 14:50:14 +0100
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</TD></TR></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE><FONT=20
size=3D-1>[<EM>Cancer Research</EM> 66, 9074-9082, September 15, =
2006]<BR>=A9 2006=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>Cell, Tumor, and Stem Cell =
Biology</H3></TD></TR></TBODY></TABLE>
<H2>IQGAP1 Protein Specifies Amplifying Cancer Cells in Glioblastoma =
Multiforme=20
</H2><STRONG></NOBR><NOBR>Laurent Balenci<SUP>1</SUP></NOBR>, <NOBR>Ian =
D.=20
Clarke<SUP>2</SUP></NOBR>, <NOBR>Peter B. Dirks<SUP>2</SUP></NOBR>, =
<NOBR>Nicole=20
Assard<SUP>1</SUP></NOBR>, <NOBR>Fran=E7ois Ducray<SUP>3</SUP></NOBR>, =
<NOBR>Anne=20
Jouvet<SUP>3</SUP></NOBR>, <NOBR>Marie-Fran=E7oise =
Belin<SUP>3</SUP></NOBR>,=20
<NOBR>Jer=F4me Honnorat<SUP>3</SUP></NOBR> and <NOBR>Jacques=20
Baudier<SUP>1</SUP></NOBR> </STRONG>
<P><FONT size=3D-1><SUP>1</SUP> Institut National de la Sant=E9 et de la =
Recherche=20
M=E9dicale EMI 0104, D=E9partement de R=E9ponse et Dynamique =
Cellulaires, CEA=20
Grenoble, Grenoble, France; <SUP>2</SUP> The Arthur and Sonia Labatt =
Brain Tumor=20
Research Center, The Hospital for Sick Children, Toronto, Ontario, =
Canada; and=20
<SUP>3</SUP> Institut National de la Sant=E9 et de la Recherche =
M=E9dicale Unit=E9=20
433, Institut F=E9d=E9ratif des Neurosciences de Lyon, Facult=E9 =
Laennec, Lyon, France=20
</FONT>
<P><FONT size=3D-1><B>Requests for reprints:</B> Jacques Baudier, =
Institut=20
National de la Sant=E9 et de la Recherche M=E9dicale EMI 0104/TS-DRDC, =
CEA Grenoble,=20
17 rue des Martyrs, 38054 Grenoble Cedex 9, France. Phone: =
33-4-38-78-43-28;=20
Fax: 33-4-38-78-50-58; E-mail: <SPAN id=3Dem0>jbaudier{at}cea.fr</SPAN>
<SCRIPT type=3Dtext/javascript><!--=0A=
 var u =3D "jbaudier", d =3D "cea.fr"; =
document.getElementById("em0").innerHTML =3D '<a href=3D"mailto:' + u + =
'@' + d + '">' + u + '@' + d + '<\/a>'//--></SCRIPT>
.</FONT>
<P>
<P><A name=3DABS><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/rarrow.gif" =
width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
      Abstract </FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#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/66/18/9074#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/66/18/9074#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/66/18/9074#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/66/18/9074#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/66/18/9074#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>T=
he=20
accurate identification and thorough characterization of<SUP> =
</SUP>tumorigenic=20
cells in glioblastomas are essential to enhance<SUP> </SUP>our =
understanding of=20
their malignant behavior and for the design<SUP> </SUP>of strategies =
that target=20
this important cell population. We<SUP> </SUP>report here that, in rat =
brain,=20
the scaffolding protein IQGAP1<SUP> </SUP>is a marker of brain=20
nestin<SUP>+</SUP> amplifying neural progenitor cells.<SUP> </SUP>In a =
rat model=20
of glioma, IQGAP1 also characterizes a subpopulation<SUP> </SUP>of=20
nestin<SUP>+</SUP> amplifying tumor cells in glioblastoma-like =
tumors<SUP>=20
</SUP>but not in tumors with oligodendroglioma features. We next =
confirmed<SUP>=20
</SUP>that IQGAP1 represents a new marker that may help to =
discriminate<SUP>=20
</SUP>human glioblastoma from oligodendrogliomas. In human =
glioblastoma<SUP>=20
</SUP>exclusively, IQGAP1 specifies a subpopulation of amplifying<SUP>=20
</SUP>nestin<SUP>+</SUP> cancer cells. Neoplastic IQGAP1<SUP>+</SUP> =
cells from=20
glioblastoma<SUP> </SUP>can be expanded in culture and possess all the=20
characteristics<SUP> </SUP>of cancer stem-like progenitors. The =
similarities=20
between amplifying<SUP> </SUP>neural progenitors and glioblastoma =
amplifying=20
cancer cells<SUP> </SUP>may have significant implications for =
understanding the=20
biology<SUP> </SUP>of glioblastoma. (Cancer Res 2006; 66(18): =
9074-82)<SUP>=20
</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/66/18/9074#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/66/18/9074#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/66/18/9074#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/66/18/9074#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/66/18/9074#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/66/18/9074#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>G=
liomas=20
are the most common primary malignant brain tumors and<SUP> </SUP>are =
classified=20
into two major groups: oligodendrogliomas and<SUP> </SUP>astrocytomas, =
including=20
glioblastomas. It is implicit in such<SUP> </SUP>definitions that these=20
neoplasms originate from either oligodendrocytes<SUP> </SUP>or =
astrocytes. There=20
is, however, evidence that these brain<SUP> </SUP>tumors can also result =
from=20
the transformation of undifferentiated<SUP> </SUP>glial progenitor cells =
or=20
cells with stem cell characteristics<SUP> </SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B1"=
>1</A>=96<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B3"=
>3</A>).=20
The first indication that some brain tumors can<SUP> </SUP>arise from=20
transformation of neural stem cells or neural progenitors<SUP> =
</SUP>comes from=20
mouse models, in which combined expression of Ras<SUP> </SUP>and Akt =
oncogenes=20
under the control of the nestin promoter induced<SUP> </SUP>glioblastoma =

formation (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B4"=
>4</A>).=20
In adult rodent brain, nestin is<SUP> </SUP>considered as a marker for =
both=20
neural stem cell and neural<SUP> </SUP>progenitors (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B5"=
>5</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B6"=
>6</A>).=20
The identification of transformed neural<SUP> </SUP>stem cell=96like =
cells in=20
cultures derived from human medulloblastomas<SUP> </SUP>and glioblastoma =
tumors=20
has brought further support to the hypothesis<SUP> </SUP>that these =
tumors=20
contain cancer stem cells that may participate<SUP> </SUP>in brain =
tumorigenesis=20
(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B7"=
>7</A>=96<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B11=
">11</A>).=20
More recently, a population<SUP> </SUP>of brain tumor-initiating cells, =
with=20
characteristics of stem<SUP> </SUP>cells =
(nestin<SUP>+</SUP>/CD133<SUP>+</SUP>),=20
has been purified from human gliomas<SUP> </SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B8"=
>8</A>).=20
In the more aggressive glioblastomas, this population represents<SUP> =
</SUP>up=20
to 30% of the total tumor cell population (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B8"=
>8</A>).=20
The neural<SUP> </SUP>stem cell concept for the origin of gliomas sheds =
light on=20
their<SUP> </SUP>heterogeneity but also raises questions as to =
understand=20
the<SUP> </SUP>high malignancy of some of these tumors, such as=20
glioblastoma<SUP> </SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B3"=
>3</A>).=20
A model has been proposed where cancer stem cells generate<SUP>=20
</SUP>transformed progenitor cells that divide rapidly but are =
incapable<SUP>=20
</SUP>of complete differentiation <I>in vivo</I> (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B3"=
>3</A>).=20
The accurate identification<SUP> </SUP>and thorough characterization of =
the=20
tumor amplifying progenitor<SUP> </SUP>cells is now essential to enhance =
our=20
understanding of malignant<SUP> </SUP>gliomas. To reach this goal, it =
will be=20
necessary to identify<SUP> </SUP>more definitive markers of these cells. =

Moreover, if these markers<SUP> </SUP>have recognized specific =
functions, they=20
might help to develop<SUP> </SUP>new therapeutic strategies for more =
effective=20
cancer treatments.<SUP> </SUP>
<P>We first report here that the IQGAP1 protein is a reliable =
marker<SUP>=20
</SUP>of nestin<SUP>+</SUP> amplifying neural progenitors in rat brain.=20
Mammalian<SUP> </SUP>IQGAP1 is considered to be a scaffolding protein at =
the=20
crossroads<SUP> </SUP>of several signaling pathways involved in the =
control of=20
cell<SUP> </SUP>adhesion (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B12=
">12</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B13=
">13</A>),=20
polarization (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B14=
">14</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B15=
">15</A>),=20
and directional migration<SUP> </SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B15=
">15</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B16=
">16</A>).=20
A recent study has identified IQGAP1 as a key component<SUP> </SUP>of =
neuronal=20
motility signal transduction (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B17=
">17</A>).=20
Several studies<SUP> </SUP>have also implicated IQGAP1 in epithelial=20
carcinogenesis and<SUP> </SUP>metastasis (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B18=
">18</A>).=20
Consistent with its possible implication in<SUP> </SUP>tumorigenesis, =
IQGAP1 is=20
highly abundant in rat and human glioma<SUP> </SUP>cell lines (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B19=
">19</A>).=20
To investigate possible regulation of IQGAP1<SUP> </SUP>during=20
neurocarcinogenesis, we analyzed IQGAP1 expression in<SUP> </SUP>a rat =
model of=20
ethylnitrosourea (ENU)-induced glioma (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B20=
">20</A>).=20
We<SUP> </SUP>show that IQGAP1 specifies a subpopulation of amplifying=20
tumor<SUP> </SUP>cells in glioblastoma-like tumors but not in tumors =
with=20
oligodendroglioma<SUP> </SUP>features. We next confirmed in human glioma =
the=20
specific expression<SUP> </SUP>of IQGAP1 in glioblastoma amplifying =
cancer=20
cells. Our results<SUP> </SUP>may have considerable implications for =
further=20
understanding<SUP> </SUP>the biology of these invasive tumors and the=20
development of<SUP> </SUP>specific and more effective therapies.<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/66/18/9074#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/66/18/9074#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/66/18/9074#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/66/18/9074#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/66/18/9074#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/66/18/9074#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>Antibodies.</B>=20
The following primary antibodies were used: IQGAP1<SUP> </SUP>(H-109; =
rabbit=20
polyclonal IgG, Santa Cruz Biotechnology, Inc.,<SUP> </SUP>Tebu-bio, =
France),=20
nestin (mouse monoclonal IgG, clone Rat-401,<SUP> </SUP>Developmental =
Studies=20
Hybridoma Bank, Iowa City, IA), specific<SUP> </SUP>human nestin (mouse=20
monoclonal, Chemicon International, Inc.,<SUP> </SUP>Euromedex, France), =
NG2=20
(mouse monoclonal, Upstate Laboratories,<SUP> </SUP>Upstate, Euromedex, =
France),=20
Olig-2 (rabbit polyclonal, generous<SUP> </SUP>gift from Dr. H. =
Chneiweiss,=20
INSERM U114, Coll=E8ge de<SUP> </SUP>France, Paris, France), GFAP (mouse =

monoclonal IgG, Chemicon;<SUP> </SUP>chicken polyclonal, Abcam, France; =
rabbit=20
polyclonal IgG, DAKO<SUP> </SUP>Cytomation, S.A, France), PECAM (CD31; =
mouse=20
monoclonal, BD<SUP> </SUP>PharMingen, BD Biosciences, France), specific =
human=20
PECAM (CD31;<SUP> </SUP>mouse monoclonal, DAKO), Ki-67 (mouse monoclonal =
IgG,=20
Novocastra<SUP> </SUP>Laboratories, Ltd., AbCys, S.A, France), specific =
human=20
Ki-67<SUP> </SUP>(rabbit polyclonal, Zymed Laboratories, Inc.,=20
Clinisciences,<SUP> </SUP>France), =DFIII-tubulin (Tuj-1; rabbit =
polyclonal,=20
Eurogentec,<SUP> </SUP>France), =DF-tubulin (mouse monoclonal, a gift =
from<SUP>=20
</SUP>Dr. D. Job, INSERM U366, Laboratoire du Cytosquelette, =
Grenoble,<SUP>=20
</SUP>France), and CD133/1 and CD133/2 (mouse monoclonal, Miltenyi<SUP>=20
</SUP>Biotec, France). Secondary anti-mouse and anti-rat antibodies<SUP> =

</SUP>conjugated to cyanin 3 or cyanin 5 were from Jackson =
ImmunoResearch<SUP>=20
</SUP>Laboratories (Interchim, France). Secondary anti-mouse and =
anti-rat<SUP>=20
</SUP>antibodies conjugated to Alexa Fluor 488 were from Molecular<SUP>=20
</SUP>Probes, Inc., (Invitrogen, France). Secondary anti-chicken =
polyclonal<SUP>=20
</SUP>IgY (ab6569) was from Abcam.<SUP> </SUP>
<P><B>Transplacental administration of ENU.</B> All procedures on =
animals<SUP>=20
</SUP>were approved by Institut National de la Sant=E9 et de<SUP> =
</SUP>la=20
Recherche M=E9dicale in compliance with European and<SUP> </SUP>French =
law. OFA=20
Sprague-Dawley strain adult rats were provided<SUP> </SUP>by Charles =
River=20
Laboratories (France). Pregnant rats were injected<SUP> </SUP>i.v. via =
tail vein=20
with 60 mg/kg ENU (Sigma-Aldrich, France)<SUP> </SUP>at gestational day =
19 (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B20=
">20</A>).<SUP>=20
</SUP>
<P><B>Human tumors.</B> Tumor samples were obtained during surgery =
from<SUP>=20
</SUP>patients of the Neurological Hospital of Lyon (Lyon, France).<SUP> =

</SUP>Inform consent was obtained for all patients before the =
surgery<SUP>=20
</SUP>as approved by the Research Ethics Board at the Hospices =
Civils<SUP>=20
</SUP>de Lyon (Lyon, France). All patients had surgery for the =
first<SUP>=20
</SUP>time and never received chemotherapy or radiotherapy. Samples<SUP> =

</SUP>were collected immediately after surgical resection, snap =
frozen<SUP>=20
</SUP>in liquid nitrogen, and stored at =96196=B0C in liquid<SUP> =
</SUP>nitrogen=20
(NeuroBioTec Banques, Biological Resources Center of<SUP> </SUP>Hospices =
Civils=20
de Lyon). A sample of glioblastoma 280, which<SUP> </SUP>was used for =
sphere=20
culture, was progressively frozen in RPMI<SUP> </SUP>1640/20% FCS/10% =
DMSO and=20
then stored at =96196=B0C in<SUP> </SUP>liquid nitrogen before to be =
used in=20
culture. Hemalin phloxine<SUP> </SUP>saffron (HPS)=96stained slide of =
all frozen=20
samples was<SUP> </SUP>reviewed by a neuropathologist (A.J.) and graded =
with the=20
WHO<SUP> </SUP>grading classification to confirm the diagnosis and =
exclude<SUP>=20
</SUP>samples without typical aspects of the tumor. All samples =
containing<SUP>=20
</SUP>significant regions of normal brain (&gt;10%) and/or =
excessively<SUP>=20
</SUP>large amounts of necrotic material were excluded. Clinical=20
presentation<SUP> </SUP>of all patients was reviewed by physicians (F.D. =
and=20
J.H.) to<SUP> </SUP>select only patients with typical clinical and=20
radiological<SUP> </SUP>presentation of glioblastomas, low-grade=20
oligodendrogliomas,<SUP> </SUP>or anaplastic oligodendrogliomas. Using =
all these=20
clinical and<SUP> </SUP>histologic criteria, nine glioblastomas (samples =
no.=20
280, 410,<SUP> </SUP>431, 492, 581, 532, 596, 658, and 733) and nine=20
oligodendrogliomas<SUP> </SUP>(grade 2 WHO oligodendroglioma samples no. =
344,=20
409, 512, 559,<SUP> </SUP>and 592; grade 3 WHO oligodendroglioma samples =
no.=20
450, 552,<SUP> </SUP>701, and 756) were selected.<SUP> </SUP>
<P><B>Immunohistochemistry.</B> Three- to 8-month-old animals were =
deeply<SUP>=20
</SUP>anesthetized and killed by transcardial perfusion of saline<SUP>=20
</SUP>solution (150 mmol/L NaCl) followed by 4% paraformaldehyde.<SUP>=20
</SUP>After 24 hours in 4% paraformaldehyde, brains were =
cryopreserved<SUP>=20
</SUP>and 20-=B5m cryostat (Leica CM 3000 Camera, AG, Germany)<SUP> =
</SUP>sections=20
were cut. Cryopreserved human biopsies were cut into<SUP> </SUP>20-=B5m =
cryostat=20
sections and postfixed with 4% paraformaldehyde.<SUP> </SUP>Cryosections =
were=20
permeabilized in TBS containing 0.2% Triton<SUP> </SUP>X-100 and blocked =
in 5%=20
normal goat serum-TBS (NGS-TBS). After<SUP> </SUP>incubation with =
primary=20
antibodies in NGS-TBS overnight at 4=B0C,<SUP> </SUP>sections were =
washed in TBS=20
and stained with the appropriate<SUP> </SUP>secondary antibodies. =
Sections were=20
counterstained with nuclear<SUP> </SUP>marker Hoechst 33258 (1 =B5g/mL). =
Images=20
were obtained with<SUP> </SUP>a Carl Zeiss, AG, Germany (Axiovert 200 M) =

microscope and with<SUP> </SUP>Leica (TCS SP2) confocal microscope.<SUP> =
</SUP>
<P><B>Immunocytochemistry.</B> Cells were fixed with 4% =
paraformaldehyde<SUP>=20
</SUP>in PBS and permeabilized with 0.2% Triton X-100. After =
incubation<SUP>=20
</SUP>with primary antibodies in NGS-TBS overnight at 4=B0C, cells<SUP> =
</SUP>were=20
washed in TBS and stained with the appropriate secondary<SUP> =
</SUP>antibodies.=20
For CD133 immunostaining, neurospheres were fixed<SUP> </SUP>and =
partially=20
permeabilized with 4% paraformaldehyde.<SUP> </SUP>
<P><B>Western blotting.</B> Cultured neurospheres and postsurgical =
human<SUP>=20
</SUP>glioma samples were lysed in SDS sample buffer. Proteins were<SUP> =

</SUP>run on 6% SDS-PAGE gel and transferred to a nitrocellulose =
membrane.<SUP>=20
</SUP>Immunoblotting was done with the different antibodies =
described<SUP>=20
</SUP>above and revealed with adequate secondary antibodies coupled<SUP> =

</SUP>to peroxidase. Blots were revealed by chemiluminescence =
according<SUP>=20
</SUP>to the manufacturer's instructions (enhanced =
chemiluminescence,<SUP>=20
</SUP>Amersham Biosciences, GE Healthcare, France). All Western =
blot<SUP>=20
</SUP>analyses were done in duplicates.<SUP> </SUP>
<P><B>Rat neurosphere culture.</B> Three-month-old rat was killed by=20
decapitation.<SUP> </SUP>Brains were removed and placed in PBS and the=20
ventricular walls<SUP> </SUP>were dissected, transferred in dissociation =
medium=20
containing<SUP> </SUP>trypsin (5,000 units; Sigma), 0.67 mg/mL =
hyaluronidase=20
(2,000<SUP> </SUP>units/mg; Sigma), and 0.2 mg/mL kynurenic acid =
(Sigma),=20
and<SUP> </SUP>kept 30 minutes in incubator (37=B0C, 5% CO<SUB>2</SUB>). =
Tissues=20
were<SUP> </SUP>washed in DMEM with 20% fetal bovine serum (FBS) to=20
inactivate<SUP> </SUP>the enzyme activity and then carefully triturated =
with a=20
Pasteur<SUP> </SUP>glass pipette. After homogenization, cells were=20
centrifuged<SUP> </SUP>and resuspended in chemically defined medium:=20
proliferation<SUP> </SUP>neurosphere medium (DMEM/F12/B27complement/0.1% =
bovine=20
serum<SUP> </SUP>albumin) supplemented with 20 ng/mL epidermal growth=20
factor<SUP> </SUP>(EGF) and 20 ng/mL basic fibroblast growth factor =
(bFGF;=20
ref.<SUP> </SUP><A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B21=
">21</A>).<SUP>=20
</SUP>
<P><B>Primary human tumor sphere culture.</B> Human tumor sample=20
corresponding<SUP> </SUP>to glioblastoma 280 was intensively washed in =
growth=20
factor<SUP> </SUP>serum-free neural stem cell medium (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B9"=
>9</A>)=20
acutely dissociated in<SUP> </SUP>trypsin/EDTA solution. After =
filtration,=20
primary tumor cells<SUP> </SUP>were cultivated in noncoated bacterial =
dishes in=20
DMEM/F12 medium<SUP> </SUP>containing B27 complement and 20 ng/mL of =
both EGF=20
and bFGF<SUP> </SUP>and leukemia inhibitory factor (1,000 units; =
Chemicon).=20
For<SUP> </SUP>differentiation experiments, neurospheres were plated =
onto=20
polylysine-coated<SUP> </SUP>(Sigma) glass coverslips in a defined =
medium=20
containing DMEM/F12/B27<SUP> </SUP>supplemented with either 3% FBS or in =
48-hour=20
starved conditioned<SUP> </SUP>medium of EaHY endothelial cell =
line.<SUP> </SUP>
<P><B>Intracranial cell transplantation into nonobese =
diabetic-severe<SUP>=20
</SUP>combined immunodeficient mice.</B> Purified CD133<SUP>+</SUP> =
cells from=20
a<SUP> </SUP>human glioblastoma were injected stereotactically into=20
immunodepressive<SUP> </SUP>nonobese diabetic-severe combined =
immunodeficient=20
(NOD-SCID)<SUP> </SUP>mouse frontal cortex as described previously (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B8"=
>8</A>).=20
Two months<SUP> </SUP>after cell injection, mouse brains were embedded =
in=20
paraffin.<SUP> </SUP>Paraffin-embedded, 5-=B5m formalin-fixed tissue =
sections<SUP>=20
</SUP>were mounted on microscope slides. Tissue sections were then<SUP>=20
</SUP>treated as described previously (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B8"=
>8</A>).<SUP>=20
</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/66/18/9074#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/66/18/9074#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/66/18/9074#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/66/18/9074#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/66/18/9074#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/66/18/9074#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>IQGAP1=20
is expressed by amplifying neural progenitors in the<SUP> </SUP>adult =
rat=20
brain.</B> Affinity-purified antibodies against an =
NH<SUB>2</SUB>-terminal<SUP>=20
</SUP>epitope that is conserved in rodent and human protein were =
used<SUP>=20
</SUP>to probe IQGAP1 protein in adult rat brain. The specificity<SUP> =
</SUP>of=20
these antibodies was first shown by Western blot and indirect<SUP>=20
</SUP>immunofluorescence analysis using mouse brain derived from =
wild-type<SUP>=20
</SUP>and <I>iqgap1</I><SUP>=96/=96</SUP> animals (data provided to =
reviewers<SUP>=20
</SUP>for examination). In adult rat brain extracts, IQGAP1 =
antibodies<SUP>=20
</SUP>recognize a single protein band with the expected molecular<SUP>=20
</SUP>weight of IQGAP1 (<I>M</I><SUB>r</SUB> 180 kDa; <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
1">Fig.=20
1<I>A, lane 1</I></A> ). By immunohistochemistry<SUP> </SUP>analyses on =
rat=20
brain sections, we determined IQGAP1 immunoreactivity<SUP> </SUP>in =
endothelial=20
cells, in the epithelial ependymal cells lining<SUP> </SUP>the lateral=20
ventricles, and in neural progenitor cells of the<SUP> </SUP>germinal =
anterior=20
subventricular zone (aSVZ) and of the rostral<SUP> </SUP>migratory =
stream (RMS;=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
1">Fig.=20
1<I>B</I> and <I>C</I></A>). In the aSVZ, IQGAP1 is<SUP> =
</SUP>associated with=20
clusters of neural progenitor cells coimmunostained<SUP> </SUP>with =
nestin=20
marker (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
1">Fig.=20
1<I>B, a</I> and <I>b</I></A>). These IQGAP1<SUP>+</SUP> cells were<SUP> =

</SUP>stained by a mitotic nuclear marker antigen Ki-67 (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
1">Fig.=20
1<I>B, c</I> and <I>d</I></A>),<SUP> </SUP>suggesting that they =
correspond to=20
amplifying neural progenitors.<SUP> </SUP>In the RMS, IQGAP1 persists in =

proliferating neural progenitors,<SUP> </SUP>which are closely =
associated with=20
blood vessels (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
1">Fig.=20
1<I>C, a-c</I></A>).<SUP> </SUP>
<P><A name=3DFIG1><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074/FIG=
1"><IMG=20
            height=3D200 alt=3D"Figure 1" hspace=3D10=20
            =
src=3D"http://cancerres.aacrjournals.org/content/vol66/issue18/images/sma=
ll/9074fig01g.gif"=20
            width=3D139 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (36K):<BR><NOBR><A=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074/FIG=
1">[in=20
            this window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('FIG1', 455, 640); =
this.href=3D'/cgi/content-nw/full/66/18/9074/FIG1'"=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content-nw/full/66/18/9074/=
FIG1"=20
            target=3DFIG1>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><B>Figure 1.</B> IQGAP1 is =
expressed in=20
            amplifying neural progenitor cells in adult rat brain. =
<I>A,</I>=20
            Western blot analysis of total adult rat brain extract =
(<I>lane=20
            1</I>) and of neurospheres derived from adult rat SVZ =
(<I>lane=20
            2</I>) with anti-IQGAP1, anti-nestin, anti-GFAP, or =
anti-=DF-tubulin=20
            (<I>tub.</I>). <I>B,</I> confocal microscope analysis of =
coronal rat=20
            brain section showing the aSVZ double immunostained with =
IQGAP1=20
            antibodies (<I>a</I> and <I>c</I>) and either nestin =
(<I>b</I>) or=20
            Ki-67 (<I>d</I>) antibody. <I>LV,</I> lateral ventricle; =
<I>CPu,</I>=20
            caudate nucleus. <I>Bar</I>, 20 =B5m. <I>C,</I> optical =
microscope=20
            analysis of saggital section of rat brain RMS triple =
immunostained=20
            with Hoechst for DNA (<I>a</I>), IQGAP1 antibodies =
(<I>b</I>), and=20
            Ki-67 antibody (<I>c</I>). <I>BV,</I> blood vessel. =
<I>Bar</I>, 20=20
            =B5m. <I>D,</I> neurospheres derived from adult rat SVZ =
grown in the=20
            presence of EGF and FGF were double labeled with IQGAP1 =
(<I>a</I>)=20
            and nestin (<I>b</I>) antibodies. <I>Bar</I>, 20 =B5m.
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR>Amplifying=20
neural progenitors have been isolated from adult<SUP> </SUP>rat SVZ and =
grown as=20
neurospheres as previously described for<SUP> </SUP>mice neural =
progenitors (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B21=
">21</A>).=20
Western blot (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
1">Fig.=20
1<I>A, lane 2</I></A>)<SUP> </SUP>and indirect immunofluorescence (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
1">Fig.=20
1<I>D</I></A>) on neurospheres confirmed<SUP> </SUP>the coexpression of =
IQGAP1=20
and nestin in neural progenitors.<SUP> </SUP>The glial marker GFAP is =
not=20
detected in neurospheres (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
1">Fig.=20
1<I>A, lane 2</I></A>),<SUP> </SUP>whereas the protein is highly =
abundant in=20
total brain extracts<SUP> </SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
1">Fig.=20
1<I>A, lane 1</I></A>).<SUP> </SUP>
<P><B>IQGAP1 specifies a population of nestin<SUP>+</SUP> tumor cells in =
a=20
rat<SUP> </SUP>model of glioblastoma-like tumor.</B> In differentiated =
cells=20
of<SUP> </SUP>the adult rat brain, IQGAP1 immunoreactivity is below the=20
detection<SUP> </SUP>limit. However, IQGAP1 protein is highly abundant =
in rat=20
and<SUP> </SUP>human cell lines derived from glioma (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B19=
">19</A>).=20
We therefore investigated<SUP> </SUP>possible regulation of IQGAP1 =
expression=20
during neurocarcinogenesis.<SUP> </SUP>
<P>In the rat, a single transplacental injection ENU into pregnant<SUP>=20
</SUP>female rat at E19 induces the development of brain tumors in<SUP>=20
</SUP>virtually 100% of offspring after several months (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B20=
">20</A>).=20
Many<SUP> </SUP>animals developed more than one intraparenchymal tumors. =

Three<SUP> </SUP>months after injection, 25 intraparenchymal tumors in =
10=20
rats<SUP> </SUP>were examined for their histologic and immunophenotypic=20
characteristics.<SUP> </SUP>Immunohistochemical characterizations =
included=20
expression of<SUP> </SUP>the astrocyte marker (GFAP), the =
oligodendrocyte=20
progenitor<SUP> </SUP>markers (Olig-2/NG2), and the neural progenitor =
markers=20
(nestin<SUP> </SUP>and IQGAP1). Two types of tumors have been =
distinguished=20
based<SUP> </SUP>on these criteria. Representative results are shown in =
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
2">Figs.=20
2</A> <SUP></SUP>and <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
3">3</A>=20
.<SUP> </SUP>
<P><A name=3DFIG2><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074/FIG=
2"><IMG=20
            height=3D168 alt=3D"Figure 2" hspace=3D10=20
            =
src=3D"http://cancerres.aacrjournals.org/content/vol66/issue18/images/sma=
ll/9074fig02g.gif"=20
            width=3D200 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (72K):<BR><NOBR><A=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074/FIG=
2">[in=20
            this window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('FIG2', 590, 570); =
this.href=3D'/cgi/content-nw/full/66/18/9074/FIG2'"=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content-nw/full/66/18/9074/=
FIG2"=20
            target=3DFIG2>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><B>Figure 2.</B> =
Immunohistochemical=20
            characterization of rat oligodendroglioma-like tumors.=20
            Representative oligodendroglioma-like tumor in the angle of =
the=20
            lateral ventricle between the corpus callosum and the =
caudate=20
            nucleus from a 90-day-old rat exposed to ENU and double=20
            immunostained with either Olig-2 (<I>A</I>) or NG2 =
(<I>B</I>)=20
            antibodies or with IQGAP1 (<I>C</I>) and GFAP (<I>D</I>) =
antibodies.=20
            <I>Bar</I>, 200 =B5m.
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR><A=20
name=3DFIG3><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074/FIG=
3"><IMG=20
            height=3D200 alt=3D"Figure 3" hspace=3D10=20
            =
src=3D"http://cancerres.aacrjournals.org/content/vol66/issue18/images/sma=
ll/9074fig03c.gif"=20
            width=3D89 vspace=3D5 border=3D2></A><BR><STRONG>View larger =

            version</STRONG> (61K):<BR><NOBR><A=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074/FIG=
3">[in=20
            this window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('FIG3', 345, 640); =
this.href=3D'/cgi/content-nw/full/66/18/9074/FIG3'"=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content-nw/full/66/18/9074/=
FIG3"=20
            target=3DFIG3>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><B>Figure 3.</B> =
Immunohistochemical=20
            characterization of rat glioblastoma-like tumors. =
Representative=20
            glioblastoma-like tumor in the cortex above the corpus =
callosum from=20
            a 90-day-old rat. <I>A</I> and <I>B,</I> low-power view =
section=20
            immunostained with IQGAP1 (<I>green, A</I> and <I>B</I>) and =
GFAP=20
            (<I>red, B</I>) antibodies shows clusters of =
IQGAP1<SUP>+</SUP>=20
            cells surrounded by GFAP<SUP>+</SUP> astrocytes. <I>Dashed =
line,</I>=20
            tumor is outlined. <I>Bar</I>, 200 =B5m. <I>C</I> to =
<I>E,</I> double=20
            immunostaining with IQGAP1 and nestin antibodies shows that =
clusters=20
            of IQGAP1<SUP>+</SUP> cells (<I>green, C</I> and <I>E</I>) =
express=20
            nestin (<I>red, D</I> and <I>E</I>). <I>Bar</I>, 20 =B5m. =
<I>F</I> to=20
            <I>H,</I> double immunostaining with anti-GFAP (<I>green, =
f</I> and=20
            <I>h</I>) and anti-Ki-67 (<I>red, G</I> and <I>H</I>) =
antibodies=20
            shows that tumor cells labeled with Ki-67 are not =
GFAP<SUP>+</SUP>.=20
            <I>Bar</I>, 50 =B5m. <I>I</I> to <I>L,</I> cluster of=20
            IQGAP1<SUP>+</SUP> cells stains with Hoechst for DNA =
(<I>I</I>) and=20
            double immunostained with anti-IQGAP1 (<I>J</I> and =
<I>L</I>) and=20
            anti-Ki-67 (<I>K</I> and <I>L</I>) antibodies shows that =
tumor cells=20
            labeled with Ki-67 correspond to IQGAP1<SUP>+</SUP> cells.=20
            <I>Bar</I>, 50 =B5m.
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR>Nineteen=20
primitive hyperplasic lesions examined have histologic<SUP>=20
</SUP>characteristics that resemble human oligodendroglioma. <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
2">Figure=20
2</A><SUP> </SUP>shows a representative image of such hyperplasic lesion =

located<SUP> </SUP>in the angle of the lateral ventricle between the =
corpus=20
callosum<SUP> </SUP>and the caudate nucleus. Histologically, these =
tumors show=20
moderate<SUP> </SUP>cellularity with relatively monomorphous round =
nuclei and=20
an<SUP> </SUP>arborized capillary network. As reported for human=20
oligodendrogliomas<SUP> </SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B22=
">22</A>),=20
the majority of tumor cells have a uniform phenotype characterized<SUP> =
</SUP>by=20
intense immunoreactivities for the oligodendrocyte precursor<SUP> =
</SUP>markers,=20
including the nuclear transcription factor Olig-2 and<SUP> </SUP>the =
cell=20
surface NG2 proteoglycan (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
2">Fig.=20
2, <I>A</I> and <I>B</I></A>) and the<SUP> </SUP>platelet-derived growth =

factor-<IMG alt=3D{alpha} =
src=3D"http://cancerres.aacrjournals.org/math/alpha.gif"=20
border=3D0> receptor (data not shown). Within<SUP> </SUP>these tumors, =
IQGAP1=20
immunoreactivity is exclusively confined<SUP> </SUP>to the capillary =
network (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
2">Fig.=20
2, <I>c</I></A>). A costaining with the<SUP> </SUP>endothelial marker =
PECAM=20
confirmed the restriction of IQGAP1<SUP> </SUP>in oligodendroglioma-like =

endothelial cells (Supplementary Fig.<SUP> </SUP>S1). These tumors also=20
incorporate reactive astrocytes identified<SUP> </SUP>based on their =
morphology=20
and immunoreactivity for GFAP marker<SUP> </SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
2">Fig.=20
2, <I>d</I></A>). Tumor cells, as well as reactive astrocytes, are<SUP>=20
</SUP>not stained with nestin antibodies, and only very few cells<SUP>=20
</SUP>express the proliferation-associated Ki-67 antigen (data not<SUP>=20
</SUP>shown). Low mitotic index is also a feature of human=20
oligodendroglioma.<SUP> </SUP>
<P>The second type of parenchymal tumor is histologically more<SUP>=20
</SUP>heterogeneous and reveals an apparent complexity of =
phenotypes<SUP>=20
</SUP>that closely resembled human glioblastoma. These tumors are<SUP>=20
</SUP>characterized by clusters of IQGAP1<SUP>+</SUP> cells surrounded =
by=20
GFAP<SUP>+</SUP><SUP> </SUP>cells (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
3">Fig.=20
3, <I>a</I> and <I>b</I></A>). The IQGAP1<SUP>+</SUP> cells are=20
coimmunostained<SUP> </SUP>with nestin (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
3">Fig.=20
3, <I>c-e</I></A>). The tumor GFAP<SUP>+</SUP> cells have mixed<SUP>=20
</SUP>phenotypes depending on their localization within the tumor<SUP>=20
</SUP>bulk. The GFAP<SUP>+</SUP> astrocyte population, which unsheathed=20
clusters<SUP> </SUP>of IQGAP1<SUP>+</SUP>/nestin<SUP>+</SUP> cells, can =
be=20
colabeled with nestin. In contrast,<SUP> </SUP>GFAP<SUP>+</SUP> =
astrocytes,=20
which accumulate to the periphery of the tumors,<SUP> </SUP>are=20
nestin<SUP>=96</SUP> (data not shown). These nestin<SUP>=96</SUP> =
astrocytes<SUP>=20
</SUP>are likely associated with reactive gliosis that accompanies<SUP>=20
</SUP>tumor development. The cellular heterogeneity of the tumors<SUP> =
</SUP>is=20
also illustrated by the presence of many tumor cells with<SUP> =
</SUP>strong NG2=20
immunoreactivity (data not shown). However, in contrast<SUP> </SUP>to=20
oligodendroglioma-like tumors, the NG2<SUP>+</SUP> tumor cells are =
totally<SUP>=20
</SUP>devoid of nuclear Olig-2 immunoreactivity (data not shown).<SUP> =
</SUP>We=20
noted a large number of proliferating Ki-67<SUP>+</SUP> cells in =
these<SUP>=20
</SUP>tumors in agreement with a malignant grade. Most of the=20
Ki-67<SUP>+</SUP><SUP> </SUP>cells form clusters unsheathed within =
astrocyte=20
processes (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
3">Fig.=20
3, <I>f-h</I></A>).<SUP> </SUP>Double immunostaining with Ki-67 and =
IQGAP1=20
antibodies shows<SUP> </SUP>that most of the Ki-67<SUP>+</SUP> cells are =

IQGAP1<SUP>+</SUP> (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
3">Fig.=20
3, <I>i-l</I></A>), indicating<SUP> </SUP>that IQGAP1<SUP>+</SUP> cells =
are part=20
of the proliferating component of<SUP> </SUP>the tumor. Hoechst staining =
does=20
not reveal fragmented nuclei,<SUP> </SUP>confirming that =
Ki-67<SUP>+</SUP> cells=20
are not undergoing apoptosis (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
3">Fig.=20
3, <I>i</I></A>).<SUP> </SUP>
<P><B>IQGAP1 expression identifies tumor amplifying cells in human<SUP>=20
</SUP>glioblastoma.</B> Having identified IQGAP1 as a specific =
marker<SUP>=20
</SUP>of amplifying tumor cells in a rat model of glioblastoma, we<SUP>=20
</SUP>next investigated whether IQGAP1 might also help to =
discriminate<SUP>=20
</SUP>human glioblastoma from oligodendroglioma. We first compared<SUP>=20
</SUP>the expression of IQGAP1 and nestin in nine human =
glioblastoma<SUP>=20
</SUP>and nine human oligodendroglioma (grades 2 and 3) by Western<SUP>=20
</SUP>blot (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
4">Fig.=20
4<I>A</I></A> ). Results show that nestin is highly expressed<SUP> =
</SUP>in=20
tumors classified as glioblastoma and almost undetectable<SUP> </SUP>in=20
oligodendroglioma with low or anaplastic features. Western<SUP> =
</SUP>blot=20
analysis also reveals a correlation between nestin expression<SUP> =
</SUP>and=20
IQGAP1 content in all glioblastoma extracts. Significant<SUP> =
</SUP>nestin=20
expression was observed only in one oligodendroglioma<SUP> =
</SUP>(patient 756).=20
Interestingly, this tumor had characteristics<SUP> </SUP>of glioblastoma =
in some=20
regions. In contrast, the astrocyte<SUP> </SUP>marker GFAP does not =
discriminate=20
glioblastoma from oligodendroglioma.<SUP> </SUP>
<P><A name=3DFIG4><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074/FIG=
4"><IMG=20
            height=3D200 alt=3D"Figure 4" hspace=3D10=20
            =
src=3D"http://cancerres.aacrjournals.org/content/vol66/issue18/images/sma=
ll/9074fig04c.gif"=20
            width=3D138 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (61K):<BR><NOBR><A=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074/FIG=
4">[in=20
            this window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('FIG4', 453, 640); =
this.href=3D'/cgi/content-nw/full/66/18/9074/FIG4'"=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content-nw/full/66/18/9074/=
FIG4"=20
            target=3DFIG4>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><B>Figure 4.</B> =
Immunohistochemical=20
            characterization of human glioma. <I>A,</I> samples of human =
brain=20
            tumors, representing grade 2 or 3 oligodendroglioma =
(<I>O2</I> and=20
            <I>O3</I>) and glioblastoma (<I>GBM</I>), were analyzed by =
Western=20
            blot for =DF-tubulin, GFAP, nestin, and IQGAP1 content. =
<I>B,</I>=20
            triple immunofluorescence analysis of low-grade =
oligodendroglioma=20
            (patient 559; <I>a-d</I>), high-grade oligodendroglioma =
(patient=20
            552; <I>e-h</I>), and glioblastoma (patient 596; <I>i-l</I>) =
stained=20
            with PECAM antibodies for endothelial cells (<I>a, e</I>, =
and=20
            <I>i</I>), GFAP (<I>b, f</I>, and <I>j</I>), and IQGAP1 =
(<I>c,=20
            g</I>, and <I>k</I>). <I>Bar</I>, 40 =B5m.
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR>Triple=20
indirect immunofluorescence analysis with IQGAP1, GFAP,<SUP> </SUP>and =
the=20
endothelial marker PECAM (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
4">Fig.=20
4<I>B</I></A>) reveals that, within<SUP> </SUP>low-grade =
oligodendroglioma (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
4">Fig.=20
4<I>B, a-d</I></A>) and in anaplastic<SUP> </SUP>oligodendroglioma =
characterized=20
by higher vascular development<SUP> </SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
4">Fig.=20
4<I>B, e-h</I></A>), IQGAP1 immunoreactivity is exclusively =
associated<SUP>=20
</SUP>with endothelial cells. This contrasts with glioblastoma, =
where<SUP>=20
</SUP>IQGAP1 immunoreactivity is present both in endothelial cells<SUP>=20
</SUP>and also in a cell population that is not stained with GFAP<SUP> =
</SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
4">Fig.=20
4<I>B, i-l</I></A>). In all glioblastoma, the=20
IQGAP1<SUP>+</SUP>/GFAP<SUP>=96</SUP><SUP> </SUP>cells are =
preferentially located=20
around blood vessels.<SUP> </SUP>
<P>Based on these observations, we did a systematic =
characterization<SUP>=20
</SUP>of the IQGAP1<SUP>+</SUP>/GFAP<SUP>=96</SUP> cells in human =
glioblastoma=20
biopsies.<SUP> </SUP>Representative results obtained with glioblastoma =
sample=20
280<SUP> </SUP>are shown.<SUP> </SUP>
<P>HPS coloration on tumor sections shows histologic features of<SUP> =
</SUP>a=20
human glioblastoma (Supplementary Fig. S2a). A GFAP staining<SUP> =
</SUP>done on=20
the same tumor sample shows that certain tumor cell<SUP> </SUP>subtypes =
are not=20
positive for this astrocyte marker showing<SUP> </SUP>the cell =
heterogeneity in=20
human glioblastoma (Supplementary<SUP> </SUP>Fig. S2b). We next used =
indirect=20
immunofluorescence to refine<SUP> </SUP>the immunologic phenotype of the =

different tumor cell populations<SUP> </SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
5">Fig.=20
5, <I>A-I</I></A> ). Triple immunostaining with GFAP, nestin, and<SUP>=20
</SUP>IQGAP1 reveals clusters of cells coexpressing IQGAP1 and =
nestin<SUP>=20
</SUP>surrounded by GFAP<SUP>+</SUP> cells (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
5">Fig.=20
5, <I>A-C</I></A>). The GFAP<SUP>+</SUP> tumor cells,<SUP> </SUP>which =
surround=20
the IQGAP1<SUP>+</SUP>/nestin<SUP>+</SUP> clusters, remain heavily<SUP>=20
</SUP>stained with nestin (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
5">Fig.=20
5, <I>A</I> and <I>B</I></A>). At higher magnification,<SUP> </SUP>the=20
IQGAP1<SUP>+</SUP>/nestin<SUP>+</SUP> clusters show a clear =
colocalization=20
of<SUP> </SUP>IQGAP1 and nestin (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
5">Fig.=20
5, <I>D-F</I></A>). Triple immunostaining with<SUP> </SUP>IQGAP1, GFAP, =
and the=20
endothelial marker PECAM confirms that<SUP> </SUP>the IQGAP<SUP>+</SUP> =
cells=20
accumulate around blood vessels (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
5">Fig.=20
5, <I>G-I</I></A>).<SUP> </SUP>On serial sections of this human =
glioblastoma=20
sample, we also<SUP> </SUP>analyzed the proliferation status of the =
different=20
tumor cell<SUP> </SUP>populations (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
5">Fig.=20
5, <I>J-R</I></A>). Low magnification observation of<SUP> </SUP>the =
tumor double=20
immunostained with GFAP and Ki-67 clearly shows<SUP> </SUP>that the =
majority of=20
proliferating cells (Ki-67<SUP>+</SUP>) are located<SUP> </SUP>within =
clusters=20
surrounded by GFAP<SUP>+</SUP> cells (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
5">Fig.=20
5, <I>J-L</I></A>). Triple<SUP> </SUP>immunostaining with GFAP, nestin, =
and=20
Ki-67 constantly revealed<SUP> </SUP>that the clusters of =
Ki-67<SUP>+</SUP>=20
cells correspond to nestin<SUP>+</SUP>/GFAP<SUP>=96</SUP><SUP> =
</SUP>cells (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
5">Fig.=20
5, <I>M-O</I></A>). It has not been possible to do colabeling<SUP> =
</SUP>of=20
Ki-67 with IQGAP1 due to the rabbit origin of the two antibodies.<SUP>=20
</SUP>Nevertheless, taking into account that clusters of=20
nestin<SUP>+</SUP>/GFAP<SUP>=96</SUP><SUP> </SUP>cells are =
IQGAP1<SUP>+</SUP> (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
5">Fig.=20
5, <I>D-F</I></A>) and that clusters of =
nestin<SUP>+</SUP>/GFAP<SUP>=96</SUP><SUP>=20
</SUP>cells are Ki-67<SUP>+</SUP> (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
5">Fig.=20
5, <I>M-O</I></A>), we can logically conclude that<SUP>=20
</SUP>Ki-67<SUP>+</SUP>/nestin<SUP>+</SUP>/GFAP<SUP>=96</SUP> cells =
correspond to=20
IQGAP1<SUP>+</SUP> tumor<SUP> </SUP>cells. There are some=20
nestin<SUP>+</SUP>/GFAP<SUP>+</SUP> cells present within the<SUP> =
</SUP>tumor=20
mass that are also Ki-67<SUP>+</SUP> (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
5">Fig.=20
5, <I>P-R</I></A>). These cells may<SUP> </SUP>correspond to tumor cells =
that=20
have acquired more differentiated<SUP> </SUP>phenotype but still retain =
the=20
capacity to proliferate.<SUP> </SUP>
<P><A name=3DFIG5><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
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        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074/FIG=
5"><IMG=20
            height=3D200 alt=3D"Figure 5" hspace=3D10=20
            =
src=3D"http://cancerres.aacrjournals.org/content/vol66/issue18/images/sma=
ll/9074fig05c.gif"=20
            width=3D89 vspace=3D5 border=3D2></A><BR><STRONG>View larger =

            version</STRONG> (58K):<BR><NOBR><A=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074/FIG=
5">[in=20
            this window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('FIG5', 345, 640); =
this.href=3D'/cgi/content-nw/full/66/18/9074/FIG5'"=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content-nw/full/66/18/9074/=
FIG5"=20
            target=3DFIG5>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><B>Figure 5.</B> IQGAP1 =
expression=20
            specifies tumor amplifying cells in human glioblastoma. =
Human=20
            glioblastoma (patient 280) sections were analyzed by =
indirect=20
            immunofluorescence and confocal microscopy. <I>A</I> to =
<I>C,</I>=20
            triple indirect immunofluorescence analysis with anti-GFAP=20
            (<I>blue</I>), anti-nestin (<I>red</I>), and anti-IQGAP1=20
            (<I>green</I>) antibodies shows that=20
            nestin<SUP>+</SUP>/IQGAP1<SUP>+</SUP> cells form clusters =
surrounded=20
            by GFAP<SUP>+</SUP>/nestin<SUP>+</SUP> cells. <I>Bar</I>, 80 =
=B5m.=20
            <I>D</I> to <I>F,</I> higher magnification of the=20
            nestin<SUP>+</SUP>/IQGAP1<SUP>+</SUP> clusters shows overlap =
between=20
            the two markers. <I>Bar</I>, 40 =B5m. <I>G</I> to <I>I,</I> =
triple=20
            immunostaining with anti-GFAP (<I>blue</I>), anti-IQGAP1=20
            (<I>green</I>), and anti-PECAM (<I>red</I>) antibodies shows =
that=20
            IQGAP1<SUP>+</SUP> cells form perivascular niches surrounded =
by=20
            GFAP<SUP>+</SUP> cells. <I>Bar</I>, 40 =B5m. <I>J</I> to =
<I>L,</I>=20
            double immunostaining with anti-GFAP and anti-Ki-67 =
antibodies shows=20
            that cells with the highest mitotic index are located within =

            clusters surrounded by GFAP<SUP>+</SUP> cells. <I>Bar</I>, =
80 =B5m.=20
            <I>M</I> to <I>O,</I> higher magnification of a cluster of=20
            nestin<SUP>+</SUP>/GFAP<SUP>=96</SUP> cells triple =
immunostained with=20
            anti-GFAP (<I>blue</I>), anti-nestin (<I>red</I>), and =
anti-Ki-67=20
            (<I>green</I>) antibodies shows that=20
            nestin<SUP>+</SUP>/GFAP<SUP>=96</SUP> cells actively =
proliferate.=20
            <I>Bar</I>, 20 =B5m. <I>P</I> to <I>R,</I> triple =
immunostaining with=20
            anti-GFAP (<I>blue</I>), anti-nestin (<I>red</I>), and =
anti-Ki-67=20
            (<I>green</I>) antibodies shows that some cells that form =
the tumor=20
            mass and that express both nestin and GFAP are also able to=20
            proliferate. <I>Bar</I>, 20 =B5m.
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR><B>IQGAP1<SUP>+</SUP>/nestin<SUP>+</SUP>=20
cells derived from glioblastoma have <I>in vitro</I><SUP> </SUP>and =
<I>in=20
vivo</I> characteristics of amplifying cancer progenitor<SUP> =
</SUP>cells.</B>=20
To confirm that the =
IQGAP1<SUP>+</SUP>/nestin<SUP>+</SUP>/GFAP<SUP>=96</SUP>=20
cells<SUP> </SUP>present in human glioblastoma represent the tumor=20
amplifying<SUP> </SUP>cells, we produced neurospheres from postsurgery =
specimens=20
of<SUP> </SUP>glioblastoma 280 as described in Materials and Methods.=20
Western<SUP> </SUP>blot analysis revealed that IQGAP1 is highly =
expressed in=20
the<SUP> </SUP>total tumor extract (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
6">Fig.=20
6<I>A, lane 1</I></A> ) and in the corresponding<SUP> </SUP>cancerous=20
neurospheres (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
6">Fig.=20
6<I>A, lane 2</I></A>). These cancerous neurospheres<SUP> </SUP>do not =
express=20
GFAP, whereas the protein is present in the original<SUP> </SUP>total =
tumor=20
extract (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
6">Fig.=20
6<I>A, lanes 1</I> and <I>2</I></A>). Two recognized<SUP> </SUP>marker =
of=20
tumorigenic glioblastoma stem-like progenitors were<SUP> </SUP>then =
chosen to=20
characterize the expanded spheres: nestin and<SUP> </SUP>CD133 (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B8"=
>8</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B11=
">11</A>).=20
Double indirect immunofluorescence reveals that<SUP> </SUP>the=20
IQGAP1<SUP>+</SUP> cells within neurospheres express both nestin =
and<SUP>=20
</SUP>CD133 (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
6">Fig.=20
6<I>B</I> and <I>C</I></A>). The intensity of staining between =
IQGAP1<SUP>=20
</SUP>and nestin may vary among cells. These differences might =
either<SUP>=20
</SUP>reflect subtle heterogeneity of neurosphere cells or are due<SUP> =
</SUP>to=20
a difference in antigen accessibility. The neurospheres can<SUP> =
</SUP>be=20
dissociated in a single cell and they are able to reform<SUP> </SUP>a =
secondary=20
neurospheres for a long time, confirming their self-renewal<SUP> =
</SUP>potency.=20
These cells have been expanded for &gt;30 passages<SUP> </SUP>with an =
average=20
doubling time estimated to 3 days. Moreover,<SUP> </SUP>the cell=20
immunophenotypes remained constant throughout passages.<SUP> </SUP>
<P><A name=3DFIG6><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
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        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074/FIG=
6"><IMG=20
            height=3D200 alt=3D"Figure 6" hspace=3D10=20
            =
src=3D"http://cancerres.aacrjournals.org/content/vol66/issue18/images/sma=
ll/9074fig06g.gif"=20
            width=3D105 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (27K):<BR><NOBR><A=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074/FIG=
6">[in=20
            this window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('FIG6', 380, 640); =
this.href=3D'/cgi/content-nw/full/66/18/9074/FIG6'"=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content-nw/full/66/18/9074/=
FIG6"=20
            target=3DFIG6>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><B>Figure 6.</B> =
IQGAP1<SUP>+</SUP> cells=20
            derived from glioblastoma have <I>in vitro</I> and <I>in =
vivo</I>=20
            characteristics of amplifying cancer cells. <I>A,</I> sample =
of=20
            human glioblastoma (280; <I>lane 1</I>) and corresponding=20
            neurospheres (<I>lane 2</I>) was analyzed by Western blot =
for GFAP,=20
            IQGAP1, and =DF-tubulin content. <I>B,</I> 280 =
glioblastoma-derived=20
            neurospheres grown in the presence of EGF and FGF were =
double=20
            labeled with IQGAP1 (<I>a</I>) and nestin (<I>b</I>) =
antibodies.=20
            <I>Bar</I>, 20 =B5m. <I>C,</I> 280 glioblastoma-derived =
neurospheres=20
            grown in the presence of EGF and FGF were double labeled =
with IQGAP1=20
            (<I>a</I>) and CD133 (<I>b</I>) antibodies. <I>Bar</I>, 20 =
=B5m.=20
            <I>D,</I> immunohistochemical characterization of human =
glioblastoma=20
            xenograft. <I>a</I> and <I>b,</I> section of mouse =
xenografted tumor=20
            derived from human CD133<SUP>+</SUP> glioblastoma tumor =
cells was=20
            stained for DNA with Hoechst (<I>a</I>) and immunostained =
with=20
            IQGAP1 antibodies (<I>b</I>). <I>Dashed line,</I> tumor is =
outlined.=20
            <I>Bar</I>, 200 =B5m. <I>c</I> and <I>d,</I> xenograft was =
double=20
            labeled with IQGAP1 (<I>c</I>) and CD133 (<I>d</I>) =
antibodies.=20
            <I>Bar</I>, 20 =B5m.
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR>A=20
property of tumorigenic glioblastoma stem-like progenitors<SUP> =
</SUP>grown as=20
neurospheres is their multipotency (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B9"=
>9</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B11=
">11</A>).=20
To examine<SUP> </SUP>the <I>in vitro</I> multipotency of the 280=20
glioblastoma-derived neurospheres,<SUP> </SUP>cells were cultured in =
different=20
culture conditions. Neurospheres<SUP> </SUP>were firstly plated onto=20
polylysine-coated coverslips in a low<SUP> </SUP>serum-containing =
medium.=20
Results show that cells spread out<SUP> </SUP>from the spheres and =
differentiate=20
down astrocyte lineage, which<SUP> </SUP>characterizes the original =
tumor=20
phenotype. Most of the cells<SUP> </SUP>express GFAP, and many of them =
coexpress=20
nestin and still proliferate<SUP> </SUP>as revealed by Ki-67 staining=20
(Supplementary Fig. S3A). Only<SUP> </SUP>rare cells express the =
neuronal marker=20
Tuj-1 (data not shown).<SUP> </SUP>To analyze the neurogenic potential =
of the=20
glioblastoma amplifying<SUP> </SUP>cancer cells, we plated neurospheres =
onto=20
polylysine-coated<SUP> </SUP>slides in conditioned medium of endothelial =
cells.=20
Enhancement<SUP> </SUP>of neuron production from multipotent neural =
progenitors=20
by<SUP> </SUP>factors secreted by endothelial cells has been previously=20
reported<SUP> </SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B23=
">23</A>).=20
In this culture condition, after 4 days, most of the =
glioblastoma-derived<SUP>=20
</SUP>cells express the neuronal marker Tuj-1 (Supplementary Fig.<SUP>=20
</SUP>S3B). As observed by others (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B9"=
>9</A>),=20
a fraction of cells were colabeled<SUP> </SUP>with both neuronal and =
glial=20
markers. This abnormal type of<SUP> </SUP>cells likely reflects aberrant =

differentiation program in tumor<SUP> </SUP>neural progenitors.<SUP> =
</SUP>
<P>CD133<SUP>+</SUP> cells can be purified from human glioblastoma, and =
as<SUP>=20
</SUP>few as 100 CD133<SUP>+</SUP> cells can produce a tumor when =
injected=20
into<SUP> </SUP>the brain of NOD-SCID mouse (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B8"=
>8</A>).=20
Analysis of IQGAP1 immunoreactivity<SUP> </SUP>in the xenograft at an =
early=20
stage of the neoplastic process<SUP> </SUP>reveals that most of the =
amplifying=20
tumor cells are heavily<SUP> </SUP>immunostained with IQGAP1 antibodies =
(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
6">Fig.=20
6<I>D, a</I> and <I>b</I></A>). Double<SUP> </SUP>immunofluorescence =
staining=20
reveals that the IQGAP1<SUP>+</SUP> xenograft<SUP> </SUP>tumor cells do =
also=20
express CD133 immunoreactivity (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
6">Fig.=20
6<I>D, c</I> and <I>d</I></A>),<SUP> </SUP>confirming the specific =
expression of=20
IQGAP1 and CD133 in glioblastoma<SUP> </SUP>amplifying cancer progenitor =
cells=20
<I>in vivo</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/66/18/9074#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/66/18/9074#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/66/18/9074#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/66/18/9074#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/66/18/9074#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/66/18/9074#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>D=
etailed=20
investigation of IQGAP1 expression in adult rat brain<SUP> </SUP>by =
indirect=20
immunofluorescence has revealed a restricted pattern<SUP> </SUP>of =
accumulation=20
of the protein in brain endothelial cells, in<SUP> </SUP>the epithelial=20
ependymal cells lining the ventricles, and in<SUP> </SUP>amplifying =
neural=20
progenitor cells abundant in the germinative<SUP> </SUP>SVZ and RMS. We =
have=20
confirmed the expression of IQGAP1 protein<SUP> </SUP>in amplifying =
neural=20
progenitors isolated from adult rat SVZ<SUP> </SUP>and grown as =
neurospheres=20
<I>in vitro</I>. In the rat brain and in<SUP> </SUP>neurosphere cells,=20
IQGAP1<SUP>+</SUP> cells also express the neural progenitor<SUP> =
</SUP>marker=20
nestin. The IQGAP1<SUP>+</SUP>/nestin<SUP>+</SUP> neural progenitors=20
associate<SUP> </SUP>as dense clusters and are generally concentrated =
around=20
blood<SUP> </SUP>vessels. This location places neural progenitor cells =
in=20
close<SUP> </SUP>proximity to the endothelial cells, facilitating=20
interaction<SUP> </SUP>and communication between these two cell types. =
These=20
cellular<SUP> </SUP>interactions are important to control neural =
progenitor=20
self-renewal<SUP> </SUP>and differentiation (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B23=
">23</A>=96<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B25=
">25</A>).=20
In a rat model of glioblastoma-like<SUP> </SUP>tumors, IQGAP1 is also =
expressed=20
by a subpopulation of nestin<SUP>+</SUP>/GFAP<SUP>=96</SUP><SUP> =
</SUP>cells. The=20
mitotic cells present in the tumors express IQGAP1,<SUP> =
</SUP>indicating that=20
the IQGAP1<SUP>+</SUP>/nestin<SUP>+</SUP> cells are part of the=20
proliferating<SUP> </SUP>component of the tumor. Our results corroborate =

previous study<SUP> </SUP>showing that, in ENU-induced rat glioma,=20
nestin<SUP>+</SUP> cells frequently<SUP> </SUP>incorporated =
bromodeoxyuridine=20
(BrdUrd), whereas other tumor<SUP> </SUP>cells expressing GFAP were only =
rarely=20
colabeled with BrdUrd<SUP> </SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B20=
">20</A>).=20
Rat cell lines can be derived from ENU-induced glioma.<SUP> </SUP>One =
example is=20
the C6 cell line used as a cellular model of<SUP> </SUP>brain glioma. A =
side=20
population of tumorigenic cancer stem-like<SUP> </SUP>cells persists in =
the C6=20
glioma cell line (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B26=
">26</A>).=20
We have purified<SUP> </SUP>C6 side population cells by flow cytometry =
(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B26=
">26</A>)=20
and shown that<SUP> </SUP>they express both IQGAP1 and nestin (data not =
shown).=20
These<SUP> </SUP>observations suggest that the=20
IQGAP1<SUP>+</SUP>/nestin<SUP>+</SUP> cells may be important<SUP> =
</SUP>in the=20
early stages of brain tumorigenesis. Several possibilities<SUP> =
</SUP>exist for=20
the source of such cells. One possibility is that<SUP> </SUP>a precursor =
cell or=20
a differentiated cell in the parenchyma<SUP> </SUP>undergoes =
transformation,=20
after which it expresses nestin and<SUP> </SUP>IQGAP1. Alternatively, a=20
nestin<SUP>+</SUP>/IQGAP1<SUP>+</SUP> neural progenitor in<SUP> =
</SUP>the SVZ=20
and the RMS could migrate to this area after transformation.<SUP> =
</SUP>Very=20
recent studies have shown that amplifying neural progenitors<SUP> =
</SUP>capable=20
of proliferation and multipotential differentiation<SUP> </SUP>can =
indeed=20
migrate to the brain parenchyma to produce new neurons<SUP> </SUP>and =
glia (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B27=
">27</A>).<SUP>=20
</SUP>
<P>In contrast to rat glioblastoma, =
IQGAP1<SUP>+</SUP>/nestin<SUP>+</SUP> tumor=20
cells<SUP> </SUP>are absent in rat tumors with oligodendroglial =
phenotypes.=20
Because<SUP> </SUP>oligodendroglioma-like tumors express oligodendrocyte =

progenitor<SUP> </SUP>markers (Olig-2/NG2), it is likely that that these =
tumors=20
are<SUP> </SUP>related to oligodendrocyte progenitors as already =
suggested<SUP>=20
</SUP>for human oligodendrogliomas (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B22=
">22</A>).=20
Oligodendrogliomas might<SUP> </SUP>arise from a stem cell that acquires =

oligodendrocyte progenitor<SUP> </SUP>phenotypes determined by =
environment (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B3"=
>3</A>)=20
or might directly derive<SUP> </SUP>from multipotent oligodendroglial=20
progenitors (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B28=
">28</A>).=20
The exact<SUP> </SUP>origin of oligodendrogliomas remains to be further=20
studied.<SUP> </SUP>To validate our results with rat brain tumor model, =
we=20
next<SUP> </SUP>studied IQGAP1 expression in human oligodendroglioma and =

glioblastoma.<SUP> </SUP>We confirmed that IQGAP1 is a reliable marker =
that may=20
help<SUP> </SUP>to distinguish oligodendroglioma from glioblastoma.=20
Although<SUP> </SUP>in both tumors IQGAP1 is expressed by endothelial =
cells,=20
only<SUP> </SUP>in glioblastoma it specifies a population of amplifying=20
tumor<SUP> </SUP>cells. Remarkably, IQGAP1 is absent from the astrocytic =

contingency<SUP> </SUP>of the tumors, which often induces bias in brain =
tumor=20
classification.<SUP> </SUP>IQGAP1 may thus represent a protein marker =
that may=20
have significant<SUP> </SUP>implication in the classification of human =
brain=20
tumors. The<SUP> </SUP>human glioblastoma IQGAP1<SUP>+</SUP> cells can =
be=20
expanded <I>in vitro</I> as<SUP> </SUP>neurospheres and exhibit features =
of=20
multipotent glioblastoma<SUP> </SUP>tumorigenic neural precursors (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FIG=
6">Fig.=20
6</A>; Supplementary Fig. S3).<SUP> </SUP><I>In vivo</I>, the amplifying =

IQGAP1<SUP>+</SUP> cancer cells are surrounded<SUP> </SUP>by tumor cells =
that=20
have down-regulated IQGAP1 expression and<SUP> </SUP>express the=20
differentiation-associated marker antigen GFAP.<SUP> </SUP>Nonetheless, =
GFAP=20
expression does not correlate with full differentiation,<SUP> </SUP>as =
the cells=20
still express the stem/progenitor cell marker nestin.<SUP> =
</SUP>Although, these=20
GFAP<SUP>+</SUP>/nestin<SUP>+</SUP> cells are still able to =
proliferate,<SUP>=20
</SUP><I>in vivo</I> and <I>in vitro</I>, they have lost their =
tumorigenicity=20
(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B8"=
>8</A>).<SUP>=20
</SUP>All together, these findings suggest that the amplifying=20
IQGAP1<SUP>+</SUP><SUP> </SUP>cancer cells are closer to a multipotent=20
progenitor cells and<SUP> </SUP>represent the most aggressive cancer =
cell=20
population in glioblastoma.<SUP> </SUP>The clusters of =
IQGAP1<SUP>+</SUP> tumor=20
cells most likely correspond to<SUP> </SUP>the glioblastoma amplifying =
cancer=20
cells that represent up to<SUP> </SUP>30% of the glioblastoma tumor cell =

population (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B8"=
>8</A>)=20
and maybe<SUP> </SUP>the cell population, which has to be target for =
more=20
effective<SUP> </SUP>cancer therapies of glioblastoma. The close =
association=20
between<SUP> </SUP>IQGAP1<SUP>+</SUP> amplifying cancer cells with blood =
vessels=20
might contribute<SUP> </SUP>to maintain cancer cells undifferentiated =
with high=20
tumorigenic<SUP> </SUP>potential. Several studies have already pointed =
out that=20
endothelial<SUP> </SUP>cells are important in the regulation of neural=20
progenitor proliferation<SUP> </SUP>and differentiation (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B23=
">23</A>=96<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B25=
">25</A>).=20
The close association between<SUP> </SUP>amplifying cancer cells and =
endothelial=20
cells also raises the<SUP> </SUP>possibility that the tumorigenic cells =
may use=20
blood vessels<SUP> </SUP>to migrate and disseminate throughout the brain =

parenchyma.<SUP> </SUP>Indeed, in both rat and human glioblastomas, the=20
perivascular<SUP> </SUP>clusters of amplifying cancer cells are not =
concentrated=20
within<SUP> </SUP>a single tumor area but are found dispersed within the =

tumor<SUP> </SUP>mass. The migratory potential of tumorigenic cells =
could=20
explain<SUP> </SUP>the local recurrence of gliomas after surgical =
resection=20
or<SUP> </SUP>radiotherapy that targets the tumor mass but does not=20
necessarily<SUP> </SUP>include the zones where cancer cells might have =
migrated.=20
The<SUP> </SUP>IQGAP1 signaling pathway might play an essential role in =
the<SUP>=20
</SUP>control of these migration and invasion processes. IQGAP1 is<SUP> =
</SUP>a=20
key component of cell motility signal transduction (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B16=
">16</A>=96<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B18=
">18</A>).<SUP>=20
</SUP>In neural precursors, in response to intracellular Ca<SUP>2+</SUP> =

elevation,<SUP> </SUP>IQGAP1 forms a complex with Rho family GTPases, =
CLIP-170=20
and<SUP> </SUP>Lis1, and enhances neuronal motility (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B17=
">17</A>).=20
In endothelial cells,<SUP> </SUP>IQGAP1 interacts with the vascular =
endothelial=20
growth factor<SUP> </SUP>(VEGF) receptor 2 (VEGF-R2) to promote =
endothelial cell=20
migration<SUP> </SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B16=
">16</A>).=20
VEGF-R2 is also expressed by neural progenitors and mediates<SUP> =
</SUP>the=20
chemotactic activities of VEGF on neural progenitors (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#B29=
">29</A>).<SUP>=20
</SUP>We have found that neurospheres derived from wild-type mice<SUP>=20
</SUP>respond to the VEGF-mediated chemokinesis but not those =
derived<SUP>=20
</SUP>from <I>iqgap1</I> null mice, suggesting that IQGAP1 signaling=20
pathway<SUP> </SUP>might play an essential role in the control of neural =

progenitor<SUP> </SUP>migration.<A name=3DRFN1></A><SUP><A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#FN1=
">4</A></SUP>=20
Considering the similarities between IQGAP1<SUP>+</SUP> amplifying<SUP>=20
</SUP>neural progenitors and IQGAP1<SUP>+</SUP> glioblastoma amplifying=20
cancer<SUP> </SUP>cells, the proposed function of IQGAP1 in the =
regulation=20
of<SUP> </SUP>neural progenitor migration can be extended to the =
amplifying<SUP>=20
</SUP>tumor cells in human glioblastoma. A better understanding of<SUP>=20
</SUP>the IQGAP1 signaling in amplifying tumor cells may open new<SUP>=20
</SUP>avenue to develop pharmacologic approach aiming to neutralize<SUP> =

</SUP>these cells, which represent the most aggressive cell type in<SUP> =

</SUP>glioblastoma.<SUP> </SUP>
<P><A name=3DACK><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/rarrow.gif" =
width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
      Acknowledgments =
</FONT></TH></TR></TBODY></TABLE>&nbsp;<BR><B>Grant support:</B>=20
Association pour la Recherche sur le Cancer grant<SUP> </SUP>4725 and =
R=E9gion=20
Rh=F4ne-Alpes Emergence grant 8HC04H00<SUP> </SUP>(J. Baudier) and =
Institut=20
National du Cancer grant PL114 (J.<SUP> </SUP>Baudier and J. =
Honnorat).<SUP>=20
</SUP>
<P>The costs of publication of this article were defrayed in part<SUP> =
</SUP>by=20
the payment of page charges. This article must therefore<SUP> </SUP>be =
hereby=20
marked <I>advertisement</I> in accordance with 18 U.S.C.<SUP> =
</SUP>Section 1734=20
solely to indicate this fact.<SUP> </SUP>
<P>We thank Dr. H. Chneiweiss for generous gift of Olig-2 =
antibodies,<SUP>=20
</SUP>Prof. J. LaMarre (Guelph University, Guelph, Ontario, Canada)<SUP> =

</SUP>for critical reading of the article, Dr. D. Grunwald for =
assistance<SUP>=20
</SUP>in confocal microscopy analysis, and Dr. J.C. Deloulme for =
advices<SUP>=20
</SUP>in neurosphere cultures.<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><B>Note:</B> Supplementary data for this =
article are=20
available at Cancer<SUP> </SUP>Research Online (<A=20
href=3D"http://cancerres.aacrjournals.org/">http://cancerres.aacrjournals=
.org/</A>).<SUP>=20
</SUP>
<P><A name=3D""><!-- null --></A>J. Honnorat and J. Baudier contributed =
equally to=20
this work.<SUP> </SUP>
<P><A name=3DFN1><!-- null --></A><SUP>4</SUP> L. Balenci, A. Bernards, =
and J.=20
Baudier, unpublished data.<SUP> </SUP><A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/18/9074#RFN=
1"><IMG=20
height=3D12 alt=3DBack =
src=3D"http://cancerres.aacrjournals.org/icons/back.gif"=20
width=3D12 border=3D0></A>
<P>Received 2/27/06. Revised 7/ 1/06. Accepted 7/25/06.
<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/66/18/9074#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/66/18/9074#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/66/18/9074#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/66/18/9074#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/66/18/9074#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/66/18/9074#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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/*=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=
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}=0A=
// Gecko support=0A=
/* ;-) */=0A=
// Opera support=0A=
if (window.opera && !window.XMLHttpRequest) {=0A=
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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=
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      var charset =3D _defaultCharset;=0A=
      var contentType =3D =
this.getResponseHeader('Content-type').toUpperCase();=0A=
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enabled.");=0A=
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current=0A=
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        this.onreadystatechange();=0A=
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      // open connection=0A=
      var url =3D new java.net.URL(new =
java.net.URL(window.location.href), this.url);=0A=
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            case 'date'            : gotDate            =3D true; break;=0A=
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            case 'last-modified'   : gotLastModified    =3D true; break;=0A=
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        }=0A=
      }=0A=
      // try to fill in any missing header information=0A=
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this._headers[this._headers.length] =3D {h:'Content-encoding', v:val};=0A=
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      if (val !=3D -1 && !gotContentLength) =
this._headers[this._headers.length] =3D {h:'Content-length', v:val};=0A=
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      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=
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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=
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        var reader =3D new java.io.BufferedReader(new =
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          reqdata +=3D line + '\n';=0A=
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        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=
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    return null;=0A=
  };=0A=
}=0A=

------=_NextPart_000_0000_01C85785.EFA3B790
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=
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          .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=
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        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=
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         */=0A=
        if (name =3D=3D "background") {=0A=
           e.style.background =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-attachment") {=0A=
          e.style.backgroundAttachment =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-color") {=0A=
          e.style.backgroundColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-image") {=0A=
          e.style.backgroundImage =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-position") {=0A=
          e.style.backgroundPosition =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-position-x") {=0A=
          e.style.backgroundPositionX =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-position-y") {=0A=
          e.style.backgroundPositionY =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-repeat") {=0A=
          e.style.backgroundRepeat =3D value;=0A=
        }=0A=
        else if (name =3D=3D "behavior") {=0A=
          e.style.behavior =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border") {=0A=
          e.style.border =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-bottom") {=0A=
          e.style.borderBottom =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-bottom-color") {=0A=
          e.style.borderBottomColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-bottom-style") {=0A=
          e.style.borderBottomStyle =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-bottom-width") {=0A=
          e.style.borderBottomWidth =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-collapse") {=0A=
          e.style.borderCollapse =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-color") {=0A=
          e.style.borderColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-left") {=0A=
          e.style.borderLeft =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-left-color") {=0A=
          e.style.borderLeftColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-left-style") {=0A=
          e.style.borderLeftStyle =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-left-width") {=0A=
          e.style.borderLeftWidth =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-right") {=0A=
          e.style.borderRight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-right-color") {=0A=
          e.style.borderRightColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-right-style") {=0A=
          e.style.borderRightStyle =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-right-width") {=0A=
          e.style.borderRightWidth =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-style") {=0A=
          e.style.borderStyle =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-top") {=0A=
          e.style.borderTop =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-top-color") {=0A=
          e.style.borderTopColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-top-style") {=0A=
          e.style.borderTopStyle =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-top-width") {=0A=
          e.style.borderTopWidth =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-width") {=0A=
          e.style.borderWidth =3D value;=0A=
        }=0A=
        else if (name =3D=3D "bottom") {=0A=
          e.style.bottom =3D value;=0A=
        }=0A=
        else if (name =3D=3D "clear") {=0A=
          e.style.clear =3D value;=0A=
        }=0A=
        else if (name =3D=3D "clip") {=0A=
          e.style.clip =3D value;=0A=
        }=0A=
        else if (name =3D=3D "color") {=0A=
          e.style.color =3D value;=0A=
        }=0A=
        else if (name =3D=3D "cssText") {=0A=
          e.style.Sets =3D value;=0A=
        }=0A=
        else if (name =3D=3D "cursor") {=0A=
          e.style.cursor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "direction") {=0A=
          e.style.direction =3D value;=0A=
        }=0A=
        else if (name =3D=3D "display") {=0A=
          e.style.display =3D value;=0A=
        }=0A=
        else if (name =3D=3D "font") {=0A=
          e.style.font =3D value;=0A=
        }=0A=
        else if (name =3D=3D "font-family") {=0A=
          e.style.fontFamily =3D value;=0A=
        }=0A=
        else if (name =3D=3D "font-size") {=0A=
          e.style.fontSize =3D value;=0A=
        }=0A=
        else if (name =3D=3D "font-style") {=0A=
          e.style.fontStyle =3D value;=0A=
        }=0A=
        else if (name =3D=3D "font-variant") {=0A=
          e.style.fontVariant =3D value;=0A=
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        else if (name =3D=3D "height") {=0A=
          e.style.height =3D value;=0A=
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        else if (name =3D=3D "min-height") {=0A=
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          e.style.paddingRight =3D value;=0A=
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          e.style.posBottom =3D value;=0A=
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          e.style.posRight =3D value;=0A=
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          e.style.textDecoration =3D value;=0A=
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          e.style.textDecorationLineThrough =3D value;=0A=
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          e.style.textDecorationNone =3D value;=0A=
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          e.style.textDecorationOverline =3D value;=0A=
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        else if (name =3D=3D "textDecorationUnderline") {=0A=
          e.style.textDecorationUnderline =3D value;=0A=
        }=0A=
        else if (name =3D=3D "text-indent") {=0A=
          e.style.textIndent =3D value;=0A=
        }=0A=
        else if (name =3D=3D "text-justify") {=0A=
          e.style.textJustify =3D value;=0A=
        }=0A=
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          e.style.textKashidaSpace =3D value;=0A=
        }=0A=
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          e.style.textOverflow =3D value;=0A=
        }=0A=
        else if (name =3D=3D "text-transform") {=0A=
          e.style.textTransform =3D value;=0A=
        }=0A=
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          e.style.textUnderlinePosition =3D value;=0A=
        }=0A=
        else if (name =3D=3D "top") {=0A=
          e.style.top =3D value;=0A=
        }=0A=
        else if (name =3D=3D "unicode-bidi") {=0A=
          e.style.unicodeBidi =3D value;=0A=
        }=0A=
        else if (name =3D=3D "vertical-align") {=0A=
          e.style.verticalAlign =3D value;=0A=
        }=0A=
        else if (name =3D=3D "visibility") {=0A=
          e.style.visibility =3D value;=0A=
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        else if (name =3D=3D "width") {=0A=
          e.style.width =3D value;=0A=
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          e.style.wordBreak =3D value;=0A=
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      }=0A=
      catch (e) {=0A=
        /* ignore error on attempt to set e.style.[property] */=0A=
      }=0A=
    }=0A=
  }=0A=
}=0A=

------=_NextPart_000_0000_01C85785.EFA3B790
Content-Type: application/octet-stream
Content-Transfer-Encoding: quoted-printable
Content-Location: http://cancerres.aacrjournals.org/javascript/entrez/callback.js

/************************************************************************=
*****=0A=
 * javascript/entrez/callback.js=0A=
 *=0A=
 * Entrez Linking callback to populate content box.=0A=
 *=0A=
 * Copyright 2006 Board of Trustees of the Leland Stanford Junior =
University.=0A=
 =
*************************************************************************=
***/=0A=
=0A=
/*=0A=
 * Execute callback to fill content box with Entrez Linking information.=0A=
 */=0A=
function entrez_callback(pmid, callback_url) {=0A=
  /*=0A=
   * MSIE 5.5 and below have issues with the JavaScript=0A=
   * used for Entrez Linking. For now we have to disable=0A=
   * the callback until we can track down a proper fix=0A=
   * (or everybody sanely upgrades to version 6 or 7!).=0A=
   */=0A=
  if (navigator) {=0A=
    var appname =3D navigator.appName;=0A=
    if (appname =3D=3D "Microsoft Internet Explorer") {=0A=
      var userAgent =3D navigator["userAgent"];=0A=
      var s =3D "MSIE ";=0A=
      var n =3D -1;      =0A=
      if ((n =3D userAgent.indexOf(s)) !=3D -1) {=0A=
        var v =3D parseFloat(userAgent.substring(n+s.length));=0A=
        if (v < 6) {=0A=
          return;=0A=
        }=0A=
      }=0A=
    }=0A=
  }=0A=
=0A=
  /*=0A=
   * Acquire table row element to update, initiate callback=0A=
   * to update table with Entrez Links.=0A=
   */=0A=
  var tr =3D document.getElementById('entrez_callback_'+pmid);=0A=
  if (!tr) {=0A=
    return;=0A=
  }=0A=
  var req =3D new XMLHttpRequest();=0A=
  if (!req) {=0A=
    return;=0A=
  }=0A=
  req.onreadystatechange =3D function() {=0A=
    if (req.readyState =3D=3D 4 && (req.status =3D=3D 200 || req.status =
=3D=3D 304)) {=0A=
      var src =3D req.responseXML.documentElement;=0A=
      var dst =3D document.createDocumentFragment();=0A=
      for (var i =3D 0; i < src.childNodes.length; i++) {=0A=
      	copy_xml_to_html(src.childNodes[i], dst);=0A=
      }=0A=
      var tbl =3D tr.parentNode;=0A=
      tbl.replaceChild(dst, tr);=0A=
    }=0A=
  }=0A=
  req.open('GET', callback_url, true);=0A=
  req.send(null);=0A=
}=0A=

------=_NextPart_000_0000_01C85785.EFA3B790
Content-Type: application/octet-stream
Content-Transfer-Encoding: quoted-printable
Content-Location: http://www.google-analytics.com/urchin.js

//-- Google Analytics Urchin Module=0A=
//-- Copyright 2007 Google, All Rights Reserved.=0A=
=0A=
//-- Urchin On Demand Settings ONLY=0A=
var _uacct=3D"";			// set up the Urchin Account=0A=
var _userv=3D1;			// service mode (0=3Dlocal,1=3Dremote,2=3Dboth)=0A=
=0A=
//-- UTM User Settings=0A=
var _ufsc=3D1;			// set client info flag (1=3Don|0=3Doff)=0A=
var _udn=3D"auto";		// (auto|none|domain) set the domain name for cookies=0A=
var _uhash=3D"on";		// (on|off) unique domain hash for cookies=0A=
var _utimeout=3D"1800";   	// set the inactive session timeout in seconds=0A=
var _ugifpath=3D"/__utm.gif";	// set the web path to the __utm.gif file=0A=
var _utsp=3D"|";			// transaction field separator=0A=
var _uflash=3D1;			// set flash version detect option (1=3Don|0=3Doff)=0A=
var _utitle=3D1;			// set the document title detect option =
(1=3Don|0=3Doff)=0A=
var _ulink=3D0;			// enable linker functionality (1=3Don|0=3Doff)=0A=
var _uanchor=3D0;			// enable use of anchors for campaign =
(1=3Don|0=3Doff)=0A=
var _utcp=3D"/";			// the cookie path for tracking=0A=
var _usample=3D100;		// The sampling % of visitors to track (1-100).=0A=
=0A=
//-- UTM Campaign Tracking Settings=0A=
var _uctm=3D1;			// set campaign tracking module (1=3Don|0=3Doff)=0A=
var _ucto=3D"15768000";		// set timeout in seconds (6 month default)=0A=
var _uccn=3D"utm_campaign";	// name=0A=
var _ucmd=3D"utm_medium";		// medium (cpc|cpm|link|email|organic)=0A=
var _ucsr=3D"utm_source";		// source=0A=
var _uctr=3D"utm_term";		// term/keyword=0A=
var _ucct=3D"utm_content";	// content=0A=
var _ucid=3D"utm_id";		// id number=0A=
var _ucno=3D"utm_nooverride";	// don't override=0A=
=0A=
//-- Auto/Organic Sources and Keywords=0A=
var _uOsr=3Dnew Array();=0A=
var _uOkw=3Dnew Array();=0A=
_uOsr[0]=3D"google";	_uOkw[0]=3D"q";=0A=
_uOsr[1]=3D"yahoo";	_uOkw[1]=3D"p";=0A=
_uOsr[2]=3D"msn";		_uOkw[2]=3D"q";=0A=
_uOsr[3]=3D"aol";		_uOkw[3]=3D"query";=0A=
_uOsr[4]=3D"aol";		_uOkw[4]=3D"encquery";=0A=
_uOsr[5]=3D"lycos";	_uOkw[5]=3D"query";=0A=
_uOsr[6]=3D"ask";		_uOkw[6]=3D"q";=0A=
_uOsr[7]=3D"altavista";	_uOkw[7]=3D"q";=0A=
_uOsr[8]=3D"netscape";	_uOkw[8]=3D"query";=0A=
_uOsr[9]=3D"cnn";	_uOkw[9]=3D"query";=0A=
_uOsr[10]=3D"looksmart";	_uOkw[10]=3D"qt";=0A=
_uOsr[11]=3D"about";	_uOkw[11]=3D"terms";=0A=
_uOsr[12]=3D"mamma";	_uOkw[12]=3D"query";=0A=
_uOsr[13]=3D"alltheweb";	_uOkw[13]=3D"q";=0A=
_uOsr[14]=3D"gigablast";	_uOkw[14]=3D"q";=0A=
_uOsr[15]=3D"voila";	_uOkw[15]=3D"rdata";=0A=
_uOsr[16]=3D"virgilio";	_uOkw[16]=3D"qs";=0A=
_uOsr[17]=3D"live";	_uOkw[17]=3D"q";=0A=
_uOsr[18]=3D"baidu";	_uOkw[18]=3D"wd";=0A=
_uOsr[19]=3D"alice";	_uOkw[19]=3D"qs";=0A=
_uOsr[20]=3D"yandex";	_uOkw[20]=3D"text";=0A=
_uOsr[21]=3D"najdi";	_uOkw[21]=3D"q";=0A=
_uOsr[22]=3D"aol";	_uOkw[22]=3D"q";=0A=
_uOsr[23]=3D"club-internet"; _uOkw[23]=3D"q";=0A=
_uOsr[24]=3D"mama";	_uOkw[24]=3D"query";=0A=
_uOsr[25]=3D"seznam";	_uOkw[25]=3D"q";=0A=
_uOsr[26]=3D"search";	_uOkw[26]=3D"q";=0A=
_uOsr[27]=3D"szukaj";	_uOkw[27]=3D"szukaj";=0A=
_uOsr[28]=3D"szukaj";	_uOkw[28]=3D"qt";=0A=
_uOsr[29]=3D"netsprint";	_uOkw[29]=3D"q";=0A=
_uOsr[30]=3D"google.interia";	_uOkw[30]=3D"q";=0A=
_uOsr[31]=3D"szukacz";	_uOkw[31]=3D"q";=0A=
_uOsr[32]=3D"yam";	_uOkw[32]=3D"k";=0A=
_uOsr[33]=3D"pchome";	_uOkw[33]=3D"q";=0A=
=0A=
=0A=
//-- Auto/Organic Keywords to Ignore=0A=
var _uOno=3Dnew Array();=0A=
//_uOno[0]=3D"urchin";=0A=
//_uOno[1]=3D"urchin.com";=0A=
//_uOno[2]=3D"www.urchin.com";=0A=
=0A=
//-- Referral domains to Ignore=0A=
var _uRno=3Dnew Array();=0A=
//_uRno[0]=3D".urchin.com";=0A=
=0A=
//-- **** Don't modify below this point ***=0A=
var =
_uff,_udh,_udt,_ubl=3D0,_udo=3D"",_uu,_ufns=3D0,_uns=3D0,_ur=3D"-",_ufno=3D=
0,_ust=3D0,_ubd=3Ddocument,_udl=3D_ubd.location,_udlh=3D"",_uwv=3D"1";=0A=
var _ugifpath2=3D"http://www.google-analytics.com/__utm.gif";=0A=
if (_udl.hash) _udlh=3D_udl.href.substring(_udl.href.indexOf('#'));=0A=
if (_udl.protocol=3D=3D"https:") =
_ugifpath2=3D"https://ssl.google-analytics.com/__utm.gif";=0A=
if (!_utcp || _utcp=3D=3D"") _utcp=3D"/";=0A=
function urchinTracker(page) {=0A=
 if (_udl.protocol=3D=3D"file:") return;=0A=
 if (_uff && (!page || page=3D=3D"")) return;=0A=
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 var nx=3D" expires=3D"+_uNx()+";";=0A=
 var dc=3D_ubd.cookie;=0A=
 _udh=3D_uDomain();=0A=
 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=
  x=3D" expires=3D"+x.toGMTString()+";";=0A=
 }=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=
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 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=
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  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=
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 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=
  if(_utcp && _utcp!=3D"/") dm+=3D_utcp;=0A=
  p=3D_ur.indexOf(dm);=0A=
  if ((p>=3D0) && (p<=3D8)) { _ur=3D"0"; }=0A=
  if (_ur.indexOf("[")=3D=3D0 && =
_ur.lastIndexOf("]")=3D=3D(_ur.length-1)) { _ur=3D"-"; }=0A=
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 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=
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  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=
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i2.src=3D_ugifpath2+"?"+"utmwv=3D"+_uwv+s+"&utmac=3D"+_uacct+"&utmcc=3D"+=
_uGCS();=0A=
  i2.onload=3Dfunction() { _uVoid(); }=0A=
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}=0A=
function _uVoid() { return; }=0A=
function _uCInfo() {=0A=
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 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""=
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 if (_uanchor && _udlh && _udlh!=3D"") s=3D_udlh+"&";=0A=
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 var dc=3D_ubd.cookie;=0A=
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  z=3D_uUES(_uGC(s,"__utmz=3D","&"));=0A=
  if (z!=3D"-" && z.indexOf(";")=3D=3D-1) { =
_ubd.cookie=3D"__utmz=3D"+z+"; path=3D"+_utcp+";"+x+_udo; return ""; }=0A=
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 if ((t!=3D"-" && t!=3D"") || (t2!=3D"-" && t2!=3D"") || (t3!=3D"-" && =
t3!=3D"")) {=0A=
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c+=3D"utmcsr=3D"+_uEC(t2); }=0A=
  if (t3!=3D"-" && t3!=3D"") { if (c !=3D "") c+=3D"|"; =
c+=3D"utmgclid=3D"+_uEC(t3); }=0A=
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  if (t!=3D"-" && t!=3D"") c+=3D"|utmccn=3D"+_uEC(t);=0A=
  else c+=3D"|utmccn=3D(not+set)";=0A=
  t=3D_uGC(s,_ucmd+"=3D","&");=0A=
  if (t!=3D"-" && t!=3D"") c+=3D"|utmcmd=3D"+_uEC(t);=0A=
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  t=3D_uGC(s,_uctr+"=3D","&");=0A=
  if (t!=3D"-" && t!=3D"") c+=3D"|utmctr=3D"+_uEC(t);=0A=
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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=
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_ufno=3D=3D1)  return ""; }=0A=
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(z!=3D"-" && _ufno=3D=3D1)  return ""; }=0A=
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  if (z=3D=3D"-" && _ufns=3D=3D1) { =
c=3D"utmccn=3D(direct)|utmcsr=3D(direct)|utmcmd=3D(none)"; }=0A=
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  if (i>-1) i=3Dz.indexOf(".",i+1);=0A=
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  t=3Dz.substring(i+1,z.length);=0A=
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 if (cs=3D=3D0 || _ufns=3D=3D1) {=0A=
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  cn++;=0A=
  if (_uns=3D=3D0) _uns=3D1;=0A=
  _ubd.cookie=3D"__utmz=3D"+_udh+"."+_ust+"."+_uns+"."+cn+"."+c+"; =
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 if (cs=3D=3D0 || _ufns=3D=3D1) return "&utmcn=3D1";=0A=
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}=0A=
function _uRef() {=0A=
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 if (h.indexOf("/") > -1) {=0A=
  k=3Dh.substring(h.indexOf("/"),h.length);=0A=
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  h=3Dh.substring(0,h.indexOf("/"));=0A=
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 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=
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n.length=3D=3D(i+_uRno[ii].length)) { _ufno=3D1; break; }=0A=
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 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=
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   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=
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     if (_uOno[yy].toLowerCase()=3D=3Dk.toLowerCase()) { _ufno=3D1; =
break; }=0A=
    }=0A=
    if (t) return _uEC(k);=0A=
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"utmccn=3D(organic)|utmcsr=3D"+_uEC(_uOsr[ii])+"|"+"utmctr=3D"+_uEC(k)+"|=
utmcmd=3Dorganic";=0A=
   }=0A=
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 }=0A=
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}=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=
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  var r=3DMath.round(Math.random()*2147483647);=0A=
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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=
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   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=
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i2[ii].src=3D_ugifpath2+"?"+"utmwv=3D"+_uwv+s+"&utmac=3D"+_uacct+"&utmcc=3D=
"+c;=0A=
   i2[ii].onload=3Dfunction() { _uVoid(); }=0A=
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 }=0A=
 return;=0A=
}=0A=
function _uFlash() {=0A=
 var f=3D"-",n=3Dnavigator;=0A=
 if (n.plugins && n.plugins.length) {=0A=
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   if (n.plugins[ii].name.indexOf('Shockwave Flash')!=3D-1) {=0A=
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  }=0A=
 } else if (window.ActiveXObject) {=0A=
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   try {=0A=
    var fl=3Deval("new =
ActiveXObject('ShockwaveFlash.ShockwaveFlash."+ii+"');");=0A=
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 return f;=0A=
}=0A=
function __utmLinker(l,h) {=0A=
 if (!_ulink) return;=0A=
 var p,k,a=3D"-",b=3D"-",c=3D"-",x=3D"-",z=3D"-",v=3D"-";=0A=
 var dc=3D_ubd.cookie;=0A=
 if (!l || l=3D=3D"") return;=0A=
 var iq =3D l.indexOf("?"); =0A=
 var ih =3D l.indexOf("#"); =0A=
 if (dc) {=0A=
  a=3D_uES(_uGC(dc,"__utma=3D"+_udh,";"));=0A=
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  c=3D_uES(_uGC(dc,"__utmc=3D"+_udh,";"));=0A=
  x=3D_uES(_uGC(dc,"__utmx=3D"+_udh,";"));=0A=
  z=3D_uES(_uGC(dc,"__utmz=3D"+_udh,";"));=0A=
  v=3D_uES(_uGC(dc,"__utmv=3D"+_udh,";"));=0A=
  k=3D(_uHash(a+b+c+x+z+v)*1)+(_udh*1);=0A=
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p=3D"__utma=3D"+a+"&__utmb=3D"+b+"&__utmc=3D"+c+"&__utmx=3D"+x+"&__utmz=3D=
"+z+"&__utmv=3D"+v+"&__utmk=3D"+k;=0A=
 }=0A=
 if (p) {=0A=
  if (h && ih>-1) return;=0A=
  if (h) { _udl.href=3Dl+"#"+p; }=0A=
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   if (iq=3D=3D-1 && ih=3D=3D-1) _udl.href=3Dl+"?"+p;=0A=
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_udl.href=3Dl.substring(0,ih-1)+"?"+p+l.substring(ih);=0A=
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}=0A=
function __utmLinkPost(f,h) {=0A=
 if (!_ulink) return;=0A=
 var p,k,a=3D"-",b=3D"-",c=3D"-",x=3D"-",z=3D"-",v=3D"-";=0A=
 var dc=3D_ubd.cookie;=0A=
 if (!f || !f.action) return;=0A=
 var iq =3D f.action.indexOf("?"); =0A=
 var ih =3D f.action.indexOf("#"); =0A=
 if (dc) {=0A=
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  b=3D_uES(_uGC(dc,"__utmb=3D"+_udh,";"));=0A=
  c=3D_uES(_uGC(dc,"__utmc=3D"+_udh,";"));=0A=
  x=3D_uES(_uGC(dc,"__utmx=3D"+_udh,";"));=0A=
  z=3D_uES(_uGC(dc,"__utmz=3D"+_udh,";"));=0A=
  v=3D_uES(_uGC(dc,"__utmv=3D"+_udh,";"));=0A=
  k=3D(_uHash(a+b+c+x+z+v)*1)+(_udh*1);=0A=
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p=3D"__utma=3D"+a+"&__utmb=3D"+b+"&__utmc=3D"+c+"&__utmx=3D"+x+"&__utmz=3D=
"+z+"&__utmv=3D"+v+"&__utmk=3D"+k;=0A=
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 if (p) {=0A=
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   else if (iq=3D=3D-1) =
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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 return;=0A=
}=0A=
function __utmSetVar(v) {=0A=
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 if (!_udo || _udo =3D=3D "") {=0A=
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 if (!_uVG()) return;=0A=
 var r=3DMath.round(Math.random() * 2147483647);=0A=
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expires=3D"+_uNx()+";"+_udo;=0A=
 var s=3D"&utmt=3Dvar&utmn=3D"+r;=0A=
 if ((_userv=3D=3D0 || _userv=3D=3D2) && _uSP()) {=0A=
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 if ((_userv=3D=3D1 || _userv=3D=3D2) && _uSP()) {=0A=
  var i2=3Dnew Image(1,1);=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=
 var t,c=3D"",dc=3D_ubd.cookie;=0A=
 if ((t=3D_uGC(dc,"__utma=3D"+_udh,";"))!=3D"-") =
c+=3D_uES("__utma=3D"+t+";+");=0A=
 if ((t=3D_uGC(dc,"__utmb=3D"+_udh,";"))!=3D"-") =
c+=3D_uES("__utmb=3D"+t+";+");=0A=
 if ((t=3D_uGC(dc,"__utmc=3D"+_udh,";"))!=3D"-") =
c+=3D_uES("__utmc=3D"+t+";+");=0A=
 if ((t=3D_uGC(dc,"__utmx=3D"+_udh,";"))!=3D"-") =
c+=3D_uES("__utmx=3D"+t+";+");=0A=
 if ((t=3D_uGC(dc,"__utmz=3D"+_udh,";"))!=3D"-") =
c+=3D_uES("__utmz=3D"+t+";+");=0A=
 if ((t=3D_uGC(dc,"__utmv=3D"+_udh,";"))!=3D"-") =
c+=3D_uES("__utmv=3D"+t+";");=0A=
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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=
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 return c;=0A=
}=0A=
function _uDomain() {=0A=
 if (!_udn || _udn=3D=3D"" || _udn=3D=3D"none") { _udn=3D""; return 1; }=0A=
 if (_udn=3D=3D"auto") {=0A=
  var d=3D_ubd.domain;=0A=
  if (d.substring(0,4)=3D=3D"www.") {=0A=
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 _udn =3D _udn.toLowerCase(); =0A=
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}=0A=
function _uHash(d) {=0A=
 if (!d || d=3D=3D"") return 1;=0A=
 var h=3D0,g=3D0;=0A=
 for (var i=3Dd.length-1;i>=3D0;i--) {=0A=
  var c=3DparseInt(d.charCodeAt(i));=0A=
  h=3D((h << 6) & 0xfffffff) + c + (c << 14);=0A=
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 return h;=0A=
}=0A=
function _uFixA(c,s,t) {=0A=
 if (!c || c=3D=3D"" || !s || s=3D=3D"" || !t || t=3D=3D"") return "-";=0A=
 var a=3D_uGC(c,"__utma=3D"+_udh,s);=0A=
 var lt=3D0,i=3D0;=0A=
 if ((i=3Da.lastIndexOf(".")) > 9) {=0A=
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  _uns=3D(_uns*1)+1;=0A=
  a=3Da.substring(0,i);=0A=
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   a=3Da.substring(0,i);=0A=
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  if ((i=3Da.lastIndexOf(".")) > 5) {=0A=
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 return a;=0A=
}=0A=
function _uTrim(s) {=0A=
  if (!s || s=3D=3D"") return "";=0A=
  while ((s.charAt(0)=3D=3D' ') || (s.charAt(0)=3D=3D'\n') || =
(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=
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}=0A=
function _uEC(s) {=0A=
  var n=3D"";=0A=
  if (!s || s=3D=3D"") return "";=0A=
  for (var i=3D0;i<s.length;i++) {if (s.charAt(i)=3D=3D" ") n+=3D"+"; =
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 =
"";  =0A=
 if ((i=3Da.indexOf(".",i2+1))>0) t=3Da.substring(i2+1,i); else return =
"";  =0A=
 if (f) {=0A=
  return r;=0A=
 } else {=0A=
  var c=3Dnew =
Array('A','B','C','D','E','F','G','H','J','K','L','M','N','P','R','S','T'=
,'U','V','W','X','Y','Z','1','2','3','4','5','6','7','8','9');=0A=
  return =
c[r>>28&m]+c[r>>23&m]+c[r>>18&m]+c[r>>13&m]+"-"+c[r>>8&m]+c[r>>3&m]+c[((r=
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&m]+c[t&m];=0A=
 }=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=
 return true;=0A=
}=0A=
function _uES(s,u) {=0A=
 if (typeof(encodeURIComponent) =3D=3D 'function') {=0A=
  if (u) return encodeURI(s);=0A=
  else return encodeURIComponent(s);=0A=
 } else {=0A=
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 }=0A=
}=0A=
function _uUES(s) {=0A=
 if (typeof(decodeURIComponent) =3D=3D 'function') {=0A=
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 } else {=0A=
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 }=0A=
}=0A=
function _uVG() {=0A=
 if((_udn.indexOf("www.google.") =3D=3D 0 || _udn.indexOf(".google.") =
=3D=3D 0 || _udn.indexOf("google.") =3D=3D 0) && _utcp=3D=3D'/' && =
_udn.indexOf("google.org")=3D=3D-1) {=0A=
  return false;=0A=
 }=0A=
 return true;=0A=
}=0A=
function _uSP() {=0A=
 var s=3D100;=0A=
 if (_usample) s=3D_usample;=0A=
 if(s>=3D100 || s<=3D0) return true;=0A=
 return ((__utmVisitorCode(1)%10000)<(s*100));=0A=
}=0A=
function urchinPathCopy(p){=0A=
 var d=3Ddocument,nx,tx,sx,i,c,cs,t,h,o;=0A=
 cs=3Dnew Array("a","b","c","v","x","z");=0A=
 h=3D_uDomain(); if (_udn && _udn!=3D"") o=3D" domain=3D"+_udn+";";=0A=
 nx=3D_uNx()+";";=0A=
 tx=3Dnew Date(); tx.setTime(tx.getTime()+(_utimeout*1000));=0A=
 tx=3Dtx.toGMTString()+";";=0A=
 sx=3Dnew Date(); sx.setTime(sx.getTime()+(_ucto*1000));=0A=
 sx=3Dsx.toGMTString()+";";=0A=
 for (i=3D0;i<6;i++){=0A=
  t=3D" expires=3D";=0A=
  if (i=3D=3D1) t+=3Dtx; else if (i=3D=3D2) t=3D""; else if (i=3D=3D5) =
t+=3Dsx; else t+=3Dnx;=0A=
  c=3D_uGC(d.cookie,"__utm"+cs[i]+"=3D"+h,";");=0A=
  if (c!=3D"-") d.cookie=3D"__utm"+cs[i]+"=3D"+c+"; path=3D"+p+";"+t+o;=0A=
 }=0A=
}=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=
 _ubd.cookie=3D"GASO=3D"+_utk+"; path=3D"+_utcp+";"+_udo;=0A=
 var sc=3Ddocument.createElement('script');=0A=
 sc.type=3D'text/javascript';=0A=
 sc.id=3D"_gasojs";=0A=
 =
sc.src=3D'https://'+d+'/analytics/reporting/overlay_js?gaso=3D'+_utk+'&'+=
Math.random();=0A=
 document.getElementsByTagName('head')[0].appendChild(sc);  =0A=
}=0A=
function _uGT() {=0A=
 var h=3Dlocation.hash, a;=0A=
 if (h && h!=3D"" && h.indexOf("#gaso=3D")=3D=3D0) {=0A=
  a=3D_uGC(h,"gaso=3D","&");=0A=
 } else {=0A=
  a=3D_uGC(_ubd.cookie,"GASO=3D",";");=0A=
 }=0A=
 return a;=0A=
}=0A=
var _utk=3D_uGT();=0A=
if (_utk && _utk!=3D"" && _utk.length>10) {=0A=
 if (window.addEventListener) {=0A=
  window.addEventListener('load', _uCO, false); =0A=
 } else if (window.attachEvent) { =0A=
  window.attachEvent('onload', _uCO);=0A=
 }=0A=
}=0A=
=0A=
function _uNx() {=0A=
  return (new Date((new Date()).getTime()+63072000000)).toGMTString();=0A=
}=0A=

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