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Subject: Relationship of glioblastoma multiforme to neural stem cell regions predicts invasive and multifocal tumor phenotype -- Lim et al. 9 (4): 424 -- Neuro-Oncology
Date: Mon, 21 Jan 2008 19:49:04 +0100
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</TD></TR></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE><FONT =
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href=3D"http://neuro-oncology.dukejournals.org/misc/terms.dtl">Duke =
University=20
Press</A> </FONT><BR>
<TABLE cellSpacing=3D0 cellPadding=3D0>
  <TBODY>
  <TR>
    <TD>
      <HR noShade SIZE=3D1>

      <H3>Basic and Translational =
Investigations</H3></TD></TR></TBODY></TABLE>
<H2>Relationship of glioblastoma multiforme to neural stem cell regions =
predicts=20
invasive and multifocal tumor phenotype</H2><STRONG></NOBR><NOBR>Daniel =
A.=20
Lim</NOBR>, <NOBR>Soonmee Cha</NOBR>, <NOBR>Mary C. Mayo</NOBR>, =
<NOBR>Mei-Hsiu=20
Chen</NOBR>, <NOBR>Evren Keles</NOBR>, <NOBR>Scott VandenBerg</NOBR> and =

<NOBR>Mitchel S. Berger</NOBR> </STRONG>
<P><FONT size=3D-1><I>Departments of Neurological Surgery (D.A.L., S.C., =
E.K.,=20
M.S.B.), Radiology (S.C., M.C.M., M.-H.C.), and Neuropathology (S.V.),=20
University of California, San Francisco, San Francisco, CA 94143, =
USA</I>=20
</FONT>
<P><FONT size=3D-1>Address correspondence to Daniel A. Lim or Mitchel S. =
Berger,=20
Department of Neurological Surgery, University of California, San =
Francisco, 505=20
Parnassus St., M779, Box 0112, San Francisco, CA 94143, USA (<SPAN=20
id=3Dem0>limd{at}neurosurg.ucsf.edu</SPAN>
<SCRIPT type=3Dtext/javascript><!--=0A=
 var u =3D "limd", d =3D "neurosurg.ucsf.edu"; =
document.getElementById("em0").innerHTML =3D '<a href=3D"mailto:' + u + =
'@' + d + '">' + u + '@' + d + '<\/a>'//--></SCRIPT>
 or <SPAN id=3Dem1>bergerm{at}neurosurg.ucsf.edu</SPAN>
<SCRIPT type=3Dtext/javascript><!--=0A=
 var u =3D "bergerm", d =3D "neurosurg.ucsf.edu"; =
document.getElementById("em1").innerHTML =3D '<a href=3D"mailto:' + u + =
'@' + d + '">' + u + '@' + d + '<\/a>'//--></SCRIPT>
). </FONT>
<P><A name=3DABS><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
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    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
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    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://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
top"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Top<BR></A><IMG height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://neuro-oncology.dukejournals.org/icons/toc/dot.gif" =
width=3D11=20
      border=3D0><FONT color=3D#464c53>Abstract</FONT><BR><A=20
      =
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
BDY"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Introduction<BR></A><A=20
      =
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
SEC1"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Materials and Methods<BR></A><A=20
      =
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
SEC2"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Results<BR></A><A=20
      =
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
SEC3"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Discussion<BR></A><A=20
      =
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
BIBL"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.org/icons/toc/darrow.gif" =
width=3D11=20
      =
border=3D0>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>N=
eural=20
stem cells with astrocyte-like characteristics exist<SUP> </SUP>in the =
human=20
brain subventricular zone (SVZ), and these cells<SUP> </SUP>may give =
rise to=20
glioblastoma multiforme (GBM). We therefore<SUP> </SUP>analyzed MRI =
features of=20
GBMs in specific relation to the SVZ.<SUP> </SUP>We reviewed the =
preoperative=20
and serial postoperative MR images<SUP> </SUP>of 53 patients with newly=20
diagnosed GBM. The spatial relationship<SUP> </SUP>of the =
contrast-enhancing=20
lesion (CEL) with the SVZ and cortex<SUP> </SUP>was determined =
preoperatively.=20
Classification was as follows:<SUP> </SUP>group I, CEL contacting SVZ =
and=20
infiltrating cortex; group II,<SUP> </SUP>CEL contacting SVZ but not =
involving=20
cortex; group III, CEL<SUP> </SUP>not contacting SVZ but involving =
cortex; and=20
group IV, CEL neither<SUP> </SUP>contacting SVZ nor infiltrating cortex. =

Patients with group<SUP> </SUP>I GBMs (<I>n</I> =3D 16) were most likely =
to have=20
multifocal disease<SUP> </SUP>at diagnosis (9 patients, 56%, <I>p</I> =
=3D 0.001).=20
In contrast, group<SUP> </SUP>IV GBMs (<I>n</I> =3D 14) were never =
multifocal.=20
Group II (<I>n</I> =3D 14) and<SUP> </SUP>group III (<I>n</I> =3D 9) =
GBMs were=20
multifocal in 11% and 29% of cases,<SUP> </SUP>respectively. Group I =
GBMs always=20
had tumor recurrences noncontiguous<SUP> </SUP>with the initial =
lesion(s), while=20
group IV GBM recurrences were<SUP> </SUP>always bordering the primary =
lesion.=20
Group I GBMs may be most<SUP> </SUP>related to SVZ stem cells; these =
tumors were=20
in intimate contact<SUP> </SUP>with the SVZ, were most likely to be =
multifocal=20
at diagnosis,<SUP> </SUP>and recurred at great distances to the initial=20
lesion(s). In<SUP> </SUP>contrast, group IV GBMs were always solitary =
lesions;=20
these<SUP> </SUP>may arise from non-SVZ, white matter glial progenitors. =

Our<SUP> </SUP>MRI-based classification of GBMs may further our=20
understanding<SUP> </SUP>of GBM histogenesis and help predict tumor =
recurrence=20
pattern.<SUP> </SUP>
<P>
<P><STRONG>Key Words:</STRONG> glioblastoma multiforme (GBM) =95 MRI =95 =
neural stem=20
cell =95 subventricular zone (SVZ) =95 tumor stem cell
<P><A name=3DBDY><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
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    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.org/icons/toc/rarrow.gif"=20
    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://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
top"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Top<BR></A><A=20
      =
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
ABS"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Abstract<BR></A><IMG height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://neuro-oncology.dukejournals.org/icons/toc/dot.gif" =
width=3D11=20
      border=3D0><FONT color=3D#464c53>Introduction</FONT><BR><A=20
      =
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
SEC1"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Materials and Methods<BR></A><A=20
      =
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
SEC2"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Results<BR></A><A=20
      =
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
SEC3"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Discussion<BR></A><A=20
      =
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
BIBL"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.org/icons/toc/darrow.gif" =
width=3D11=20
      =
border=3D0>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR><=
B>R</B>ecent=20
studies demonstrate that glioblastoma multiforme (GBM)<SUP> =
</SUP>contains a=20
subpopulation of cancer cells with stem cell characteristics,<SUP>=20
</SUP>including self-renewal and multipotentiality; these cancer =
stem<SUP>=20
</SUP>cells can propagate tumors in vivo.<SUP><A=20
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
REF1">1</A>-<A=20
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
REF4">4</A></SUP>=20
The adult human brain<SUP> </SUP>harbors astrocyte-like neural stem =
cells within=20
the subventricular<SUP> </SUP>zone (SVZ), which is located just under =
the=20
ependyma of the<SUP> </SUP>brain ventricles<SUP><A=20
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
REF5">5</A>,<A=20
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
REF6">6</A></SUP>=20
(<A=20
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
FIG1">Fig.=20
1A</A>). In animal models, gliomas=97including<SUP> </SUP>GBM=97can be =
induced from=20
SVZ cells.<SUP><A=20
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
REF7">7</A>-<A=20
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
REF9">9</A></SUP>=20
These accumulating<SUP> </SUP>data have thus given rebirth to the notion =
that=20
human gliomas<SUP> </SUP>may arise from SVZ neural stem cells (reviewed =
in Sanai=20
et al.<SUP><A=20
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
REF10">10</A></SUP>),<SUP>=20
</SUP>an idea that was first suggested in the first half of the =
20th<SUP>=20
</SUP>century.<SUP><A=20
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
REF11">11</A>-<A=20
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
REF13">13</A></SUP><SUP>=20
</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://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424/F=
IG1"><IMG=20
            height=3D184 alt=3D"Figure 1" hspace=3D10=20
            =
src=3D"http://neuro-oncology.dukejournals.org/content/vol9/issue4/images/=
small/Lim_Fig._1.gif"=20
            width=3D200 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (63K):<BR><NOBR><A=20
            =
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424/F=
IG1">[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', 590, 604); =
this.href=3D'/cgi/content-nw/full/9/4/424/FIG1'"=20
            =
href=3D"http://neuro-oncology.dukejournals.org/cgi/content-nw/full/9/4/42=
4/FIG1"=20
            target=3DFIG1>[in a new window]</A><BR><BR>&nbsp;</NOBR> =
</TD>
          <TD vAlign=3Dtop align=3Dleft>Fig. 1. (A) Neural stem cells =
(red=20
            circles) are found in the walls of the adult brain =
ventricles=20
            (blue). An axial section (black trapezoid) is indicated on =
this=20
            cartoon, representing the approximate level of section of =
the MR=20
            images shown. (B) Multiple hypotheses of brain tumor origin: =

            subventricular zone (SVZ) stem cells (S, red) normally =
self-renew=20
            and produce progenitor cells (light green, glial [g]; light =
blue,=20
            neuronal [n]), which then progress through a developmental =
lineage=20
            (e.g., g<SUP>1</SUP> <IMG alt=3D"->"=20
            src=3D"http://neuro-oncology.dukejournals.org/math/rarr.gif" =
border=3D0>=20
            g<SUP>2</SUP>...) and differentiate into mature neurons (N, =
dark=20
            blue) or glia (G, dark green). g<SUP>1</SUP> and =
n<SUP>1</SUP> cells=20
            are highly migratory progenitors, directly descendent of SVZ =
stem=20
            cells. g<SUP>2</SUP> and n<SUP>2</SUP> cells represent less=20
            migratory local progenitors. theories include the following: =
(1)=20
            stem cells become dysregulated and give rise to glioma cells =
(t,=20
            orange); (2) highly migratory progenitor cells are the=20
            tumor-initiating cells; (3) local progenitors with limited =
migration=20
            give rise to the tumor; and (4) mature glial cells =
dedifferentiate=20
            to produce tumor cells. (C) Schematic of the different =
groups of=20
            glioblastoma multiforme (GBM) lesions based on MRI patterns. =
(D-G)=20
            Axial postcontrast t1-weighted MR images of representative =
examples=20
            for each group (I-IV) in this classification system. (D) For =
this=20
            group I GBM, note that the contrast-enhancing lesion (CEL) =
extends=20
            from the atrium SVZ to the pia. Interestingly, despite the =
large=20
            size, this GBM exerts relatively little mass effect. (E) =
Group II:=20
            SVZ-contacting tumor that does not involve the cortex. (F) =
Group=20
            III: the CEL is invading the cortex, reaching the pia, but =
does not=20
            touch the SVZ. (G) Group IV: these lesions "respect" both =
the SVZ=20
            and cortex; the CEL mass tends to displace brain matter =
rather than=20
            directly invade the cortex and reach the ventricle wall.
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR>GBM=20
is a pathologically and clinically heterogeneous disease.<SUP> =
</SUP>While some=20
GBMs may arise from transformed SVZ stem cells, other<SUP> </SUP>gliomas =
may be=20
initiated by neoplastic transformation of non-SVZ<SUP> </SUP>progenitor =
cells or=20
mature glial cells that have undergone dedifferentiation<SUP><A=20
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
REF14">14</A></SUP><SUP>=20
</SUP>(<A=20
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
FIG1">Fig.=20
1B</A>). Identifying a subset of GBMs that are related to<SUP> =
</SUP>tumor stem=20
cells in the SVZ would have significant therapeutic<SUP>=20
</SUP>implications:<SUP><A=20
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
REF15">15</A></SUP>=20
stem-cell-derived GBM may need treatment that<SUP> </SUP>attends to both =
the=20
primary lesion(s) and the SVZ. To better<SUP> </SUP>understand the =
histogenetic=20
and clinical heterogeneity of GBM,<SUP> </SUP>we developed an MRI-based=20
classification of GBMs based on their<SUP> </SUP>involvement of the SVZ =
and=20
cortex.<SUP> </SUP>
<P><SUP></SUP>
<P>We identified a subset of GBMs that are more likely to be SVZ<SUP> =
</SUP>stem=20
cell - related based on the spatial relationship of the<SUP> </SUP>tumor =
to the=20
SVZ, involvement of cortex, multifocality, and<SUP> </SUP>recurrence =
pattern.=20
Another GBM subset is more likely related<SUP> </SUP>to non-SVZ =
progenitor cells=20
or dedifferentiated glial cells.<SUP> </SUP>This study provides MRI =
evidence=20
suggesting a relationship between<SUP> </SUP>a subset of GBMs and tumor =
stem=20
cells in the SVZ.<SUP> </SUP>
<P><A name=3DSEC1><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.org/icons/toc/rarrow.gif"=20
    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://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
top"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Top<BR></A><A=20
      =
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
ABS"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Abstract<BR></A><A=20
      =
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
BDY"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Introduction<BR></A><IMG height=3D9 alt=3D" " =
hspace=3D5=20
      src=3D"http://neuro-oncology.dukejournals.org/icons/toc/dot.gif" =
width=3D11=20
      border=3D0><FONT color=3D#464c53>Materials and =
Methods</FONT><BR><A=20
      =
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
SEC2"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Results<BR></A><A=20
      =
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
SEC3"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Discussion<BR></A><A=20
      =
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
BIBL"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.org/icons/toc/darrow.gif" =
width=3D11=20
      =
border=3D0>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>W=
e studied=20
53 consecutive patients with newly diagnosed GBM<SUP> </SUP>who =
underwent=20
preoperative, immediately postoperative (within<SUP> </SUP>48 h after =
surgery),=20
and subsequent follow-up MR images as a<SUP> </SUP>part of a brain tumor =
imaging=20
research study (SPORE project<SUP> </SUP>grant). Informed consent for=20
participation in this study was<SUP> </SUP>obtained from each patient in =

accordance to institutional protocol.<SUP> </SUP>The medical records of =
all 53=20
patients were reviewed.<SUP> </SUP>
<P>All patients underwent the same preoperative MRI protocol, which<SUP> =

</SUP>consisted of a three-plane localizer sequence (8.5/1.6 ms =
[TR/TE]),<SUP>=20
</SUP>an axial fluid-attenuated inversion-recovery (FLAIR) sequence<SUP> =

</SUP>(10,000/148/2,200 [TR/TE/TI]), an axial fast spin-echo =
T2-weighted<SUP>=20
</SUP>sequence (3,000/102, echo train length 16, matrix 256 <FONT=20
face=3Darial,helvetica>x</FONT> 196),<SUP> </SUP>axial =
diffusion-weighted imaging=20
(10,000/99, b =3D 1,000 s/mm<SUP>2</SUP>),<SUP> </SUP>and a postcontrast =

three-dimensional spoiled gradient-recalled<SUP> </SUP>acquisition in =
the steady=20
state (SPGR; 34/8) T1-weighted sequence.<SUP> </SUP>Postoperatively, we =
obtained=20
additional postcontrast imaging<SUP> </SUP>in the coronal and axial =
planes.<SUP>=20
</SUP>
<P>A neuroradiologist (S.C.) and MRI research assistant (M.C.M.)<SUP>=20
</SUP>reviewed each tumor for the following on preoperative =
imaging:<SUP>=20
</SUP>distance of contrast-enhancing lesion (CEL) to nearest =
ventricle,<SUP>=20
</SUP>infiltration of CEL into cortex, volume of CEL, and =
anatomical<SUP>=20
</SUP>location of the primary (largest volume) CEL. Multifocal =
disease<SUP>=20
</SUP>at initial diagnosis was recognized by the presence of CELs<SUP> =
</SUP>or=20
nonenhancing FLAIR lesions not typical of nonspecific white<SUP> =
</SUP>matter=20
disease and suspicious for tumor that were noncontiguous<SUP> </SUP>with =
the=20
primary CEL. Distances and volumes were measured with<SUP> </SUP>qBrain =
(Medis=20
Medical Imaging, Leesburg, VA, USA). Tumor recurrence,<SUP> =
</SUP>determined=20
based on contrast-enhanced T1-weighted MR images,<SUP> </SUP>was defined =
as a=20
new or progressive increase in CEL, within<SUP> </SUP>the initial =
surgical=20
resection site and/or in a remote location.<SUP> </SUP>Statistical =
analyses were=20
performed using SAS version 9.1 (SAS<SUP> </SUP>Institute Inc., Cary, =
NC, USA).=20
The likelihood ratio test of<SUP> </SUP>independence was used to =
evaluate the=20
incidence rate of multifocal<SUP> </SUP>GBM among groups. Assuming there =
is a=20
natural ordering in severity<SUP> </SUP>among groups (group I is more =
severe=20
than group II, group II<SUP> </SUP>is more severe than group III, etc.), =
the=20
Cochran-Armitage trend<SUP> </SUP>test was used to assess the =
association=20
between the incidence<SUP> </SUP>rate and group order. To assess the=20
contribution of individual<SUP> </SUP>variables (SVZ contact, cortical=20
involvement, patient age, and<SUP> </SUP>tumor volume) to the incidence =
of=20
multifocal GBM, we performed<SUP> </SUP>both univariate and multivariate =

analyses, as described in Results.<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://neuro-oncology.dukejournals.org/icons/toc/rarrow.gif"=20
    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://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
top"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Top<BR></A><A=20
      =
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
ABS"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Abstract<BR></A><A=20
      =
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
BDY"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Introduction<BR></A><A=20
      =
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
SEC1"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.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://neuro-oncology.dukejournals.org/icons/toc/dot.gif" =
width=3D11=20
      border=3D0><FONT color=3D#464c53>Results</FONT><BR><A=20
      =
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
SEC3"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Discussion<BR></A><A=20
      =
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
BIBL"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.org/icons/toc/darrow.gif" =
width=3D11=20
      =
border=3D0>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>G=
BMs were=20
classified preoperatively into four groups by the<SUP> </SUP>spatial=20
relationship of the CEL with the SVZ and cortex as follows:<SUP> =
</SUP>group I,=20
CEL contacting SVZ and infiltrating cortex; group II,<SUP> </SUP>CEL =
contacting=20
SVZ but not involving cortex; group III, CEL<SUP> </SUP>not contacting =
SVZ but=20
involving cortex; and group IV, CEL neither<SUP> </SUP>contacting SVZ =
nor=20
infiltrating cortex (<A=20
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
FIG1">Fig.=20
1C-G</A>). <A=20
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
TBL1">Table=20
1</A><SUP> </SUP>lists patient demographics and tumor MRI =
characteristics.<SUP>=20
</SUP>
<P><A name=3DTBL1><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><STRONG>View =
this=20
            table:</STRONG><BR><NOBR><A=20
            =
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424/T=
BL1">[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('TBL1', 500, 400); =
this.href=3D'/cgi/content-nw/full/9/4/424/TBL1'"=20
            =
href=3D"http://neuro-oncology.dukejournals.org/cgi/content-nw/full/9/4/42=
4/TBL1"=20
            target=3DTBL1>[in a new window]</A><BR><BR>&nbsp;</NOBR> =
</TD>
          <TD vAlign=3Dtop align=3Dleft><B>Table 1.</B> Patient =
demographics and=20
            MRI characteristics of glioblastoma multiforme (GBM) in =
groups I-IV
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR><SUP></SUP>
<P>Multifocal GBM is suggestive of a more invasive and migratory<SUP>=20
</SUP>tumor phenotype, a feature more common to stem-cell-derived<SUP>=20
</SUP>cancer.<SUP><A=20
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
REF16">16</A></SUP>=20
We therefore examined the incidence of multifocal<SUP> </SUP>GBM among =
the four=20
groups defined above. Patients with group<SUP> </SUP>I GBMs had the =
highest=20
frequency of multifocal disease (<A=20
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
FIG2">Fig.=20
2A-C</A>)<SUP> </SUP>at initial diagnosis (9 of 16 patients, 56%). In =
contrast,=20
patients<SUP> </SUP>with group IV tumors did not have multifocal =
disease.=20
Patients<SUP> </SUP>with group II and III GBMs had multifocal disease in =
11%=20
and<SUP> </SUP>29% of cases, respectively. There was a significant=20
difference<SUP> </SUP>in the incidence of multifocal GBM among the four =
groups=20
(<I>p</I><SUP> </SUP>=3D 0.001, likelihood ratio test of independence). =
In=20
addition,<SUP> </SUP>the results of Cochran-Armitage exact trend test =
indicated=20
that<SUP> </SUP>the incidence of multifocal GBM was highest for group I =
and<SUP>=20
</SUP>lowest for group IV (two-sided test, <I>p</I> =3D 0.002).<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://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424/F=
IG2"><IMG=20
            height=3D148 alt=3D"Figure 2" hspace=3D10=20
            =
src=3D"http://neuro-oncology.dukejournals.org/content/vol9/issue4/images/=
small/Lim_Fig._2.gif"=20
            width=3D200 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (49K):<BR><NOBR><A=20
            =
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424/F=
IG2">[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, 526); =
this.href=3D'/cgi/content-nw/full/9/4/424/FIG2'"=20
            =
href=3D"http://neuro-oncology.dukejournals.org/cgi/content-nw/full/9/4/42=
4/FIG2"=20
            target=3DFIG2>[in a new window]</A><BR><BR>&nbsp;</NOBR> =
</TD>
          <TD vAlign=3Dtop align=3Dleft>Fig. 2. (A-C) Axial postcontrast =

            t1-weighted MR images of the same patient showing an example =
of=20
            group I multifocal glioblastoma multiforme (GBM). the=20
            contrast-enhancing lesion (CEL) contacts the posterior =
temporal horn=20
            subventricular zone (SVZ) in A. Rostrally, there are at =
least three=20
            separate lesions in B and two in C, including one in the=20
            contralateral hemisphere (orange asterisk). (D and E) =
Recurrence of=20
            group I GBM in distant SVZ location. (D) Preoperative axial=20
            postcontrast t1-weighted MR images of a patient with group I =
GBM.=20
            this patient did not have multifocal disease preoperatively. =
(E)=20
            Fifteen months postoperatively, there was an enhancing mass =
lesion=20
            in the SVZ of the contralateral frontal horn (orange =
arrowhead)=20
            consistent with tumor recurrence. In addition, there is =
subependymal=20
            enhancement bilaterally. No abnormal subarachnoid =
enhancement was=20
            found in this or other images of this patient. (F-H) =
Integration of=20
            GBM cell-of-origin data from animal models with human MRI =
data. (F)=20
            P53<SUP>-</SUP>, NF1<SUP>-</SUP> SVZ astrocytes give rise to =
group=20
            I- and group II-like GBMs in the mouse. this coronal =
schematic shows=20
            an example of a group I tumor (red) extending from the SVZ =
to the=20
            pia. (G) A schematic of human group I and II GBMs in a =
similar=20
            coronal plane. (H) Model of group I and group IV GBM =
subtypes. At=20
            diagnosis, group I GBMs were often multifocal (9 of 16, =
56%),=20
            possibly from the migration of tumor-initiating cells from =
either=20
            the SVZ or tumor mass. After resection, group I GBM always =
recurred=20
            at locations noncontiguous with the initial lesion(s). =
Distant,=20
            recurrent lesions may arise from tumor cells migrating from =
the SVZ=20
            through the parenchyma (solid arrow) or along the SVZ itself =
(dotted=20
            arrows). the cell of origin of group I GBMs may reside in or =
near=20
            the SVZ, and tumor cells derived from SVZ neural stem cells =
may have=20
            a greater migratory potential than those of group IV. Group =
IV GBMs=20
            occurred only as solitary lesions, and group IV GBM =
recurrences were=20
            always contiguous with the resection cavity. Group IV GBMs =
may arise=20
            from non-SVZ progenitor cells that have a limited migration=20
            potential.
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR>The=20
contribution of individual variables (SVZ contact, cortical<SUP>=20
</SUP>involvement, patient age, and tumor volume) was investigated<SUP> =
</SUP>by=20
both univariate and multivariate analysis. Univariate analysis<SUP> =
</SUP>showed=20
that only SVZ contact (<I>p</I> =3D 0.04) and cortical involvement<SUP>=20
</SUP>(<I>p</I> =3D 0.01) are significantly associated with =
multifocality.<SUP>=20
</SUP>Multivariate analysis was conducted using a stepwise =
selection<SUP>=20
</SUP>with 0.1 significance level to enter the model and 0.1 =
significance<SUP>=20
</SUP>level for staying in the model, and the resulting model =
included<SUP>=20
</SUP>both SVZ contact and cortical involvement.<SUP> </SUP>
<P>Follow-up MRI was available for 11 of 16 group I patients =
(follow-up<SUP>=20
</SUP>period of 5-23 months) and 13 of 14 group IV GBM patients =
(follow-up<SUP>=20
</SUP>period of 3-38 months). For the 11 evaluable group I GBM =
patients,<SUP>=20
</SUP>tumors recurred in all cases, and CELs were always found in<SUP>=20
</SUP>locations noncontiguous with the primary lesion(s), in =
addition<SUP>=20
</SUP>to recurrence at the resection cavity (<A=20
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
FIG2">Fig.=20
2D,E</A>). Nine of these<SUP> </SUP>11 patients had CELs in distant SVZ=20
locations (contralateral<SUP> </SUP>in two cases), and two had CELs in=20
noncontiguous brain parenchyma<SUP> </SUP>(contralateral in one case). =
For the=20
13 evaluable group IV GBM<SUP> </SUP>patients, 10 had tumor recurrence=20
contiguous with the resection<SUP> </SUP>cavity, and none had any =
evidence of=20
noncontiguous tumor.<SUP> </SUP>
<P><A name=3DSEC3><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.org/icons/toc/rarrow.gif"=20
    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://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
top"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Top<BR></A><A=20
      =
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
ABS"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Abstract<BR></A><A=20
      =
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
BDY"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Introduction<BR></A><A=20
      =
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
SEC1"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Materials and Methods<BR></A><A=20
      =
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
SEC2"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Results<BR></A><IMG height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://neuro-oncology.dukejournals.org/icons/toc/dot.gif" =
width=3D11=20
      border=3D0><FONT color=3D#464c53>Discussion</FONT><BR><A=20
      =
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
BIBL"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.org/icons/toc/darrow.gif" =
width=3D11=20
      =
border=3D0>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>O=
ur=20
results show that GBMs contacting the SVZ and involving<SUP> </SUP>the =
cortex=20
(group I) were most likely to be multifocal at the<SUP> </SUP>time of =
initial=20
diagnosis and were more likely to have recurrent<SUP> </SUP>tumor at =
locations=20
distant to the initial lesion. GBMs not involving<SUP> </SUP>either the =
SVZ or=20
the cortex (group IV) were not multifocal<SUP> </SUP>at diagnosis and =
always=20
recurred within 2 cm of the resection<SUP> </SUP>margin.<SUP> </SUP>
<P><SUP></SUP>
<P>Group I GBMs may be most closely related to SVZ neural stem<SUP> =
</SUP>cells.=20
The physical association of malignant glioma with the<SUP> </SUP>SVZ has =
led=20
neuropathologists to suggest that these tumors arise<SUP> </SUP>from =
this region=20
of the brain.<SUP><A=20
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
REF11">11</A>-<A=20
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
REF13">13</A></SUP>=20
This hypothesis is supported<SUP> </SUP>by the results of animal model=20
experiments involving viral or<SUP> </SUP>carcinogen transformation of =
SVZ cells=20
and resultant tumor formation.<SUP><A=20
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
REF10">10</A></SUP><SUP>=20
</SUP>Recently, Zhu et al.<SUP><A=20
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
REF9">9</A></SUP>=20
demonstrated that p53 inactivation cooperates<SUP> </SUP>with NF1 loss =
to induce=20
GBM formation from mouse SVZ astrocytes;<SUP> </SUP>intriguingly, these=20
SVZ-derived tumors usually contact the SVZ<SUP> </SUP>and infiltrate the =
cortex=20
like human group I GBMs (<A=20
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
FIG2">Fig.=20
2F,G</A>).<SUP> </SUP>
<P>The multifocality at diagnosis and recurrence pattern of group<SUP> =
</SUP>I=20
GBMs suggest that the cell of origin of this tumor type is<SUP> =
</SUP>highly=20
migratory and invasive (see <A=20
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
FIG2">Fig.=20
2H</A>). Neural stem cells<SUP> </SUP>express matrix metalloproteinases=20
(MMPs)=97proteolytic enzymes<SUP> </SUP>implicated in tumor cell =
metastasis=97and=20
although the adult<SUP> </SUP>brain as a whole does not express MMPs, =
gliomas=20
overexpress<SUP> </SUP>certain MMPs, leading to increased invasiveness =
(reviewed=20
in<SUP> </SUP>Yong et al.<SUP><A=20
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
REF17">17</A></SUP>).=20
It is possible that gliomas arising from stem<SUP> </SUP>cells maintain =
neural=20
stem cell MMP expression. The SVZ region,<SUP> </SUP>or niche, may also =
be=20
highly permissive for both tumor growth<SUP> </SUP>and cellular =
migration,=20
allowing tumor stem cells and their<SUP> </SUP>progeny to rapidly =
proliferate=20
and migrate under the ependyma.<SUP> </SUP>
<P>In this study, group IV GBMs occurred as solitary lesions and<SUP>=20
</SUP>recurred only around the resection cavity of the initial =
tumor,<SUP>=20
</SUP>suggesting that these tumor cells are less migratory than =
their<SUP>=20
</SUP>group I counterparts. Group IV GBMs were not intimately =
associated<SUP>=20
</SUP>with the SVZ (and often displaced the SVZ away with their =
mass),<SUP>=20
</SUP>suggesting that these tumors arise from non-SVZ progenitor =
cells.<SUP>=20
</SUP>Progenitor cells expressing the chondroitin sulfate =
proteoglycan<SUP>=20
</SUP>NG2 (neuronal/glial 2) are found throughout adult human =
brain.<SUP><A=20
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
REF18">18</A></SUP><SUP>=20
</SUP>In the mouse, NG2<SUP>+</SUP> progenitor cells from non-SVZ =
regions=20
have<SUP> </SUP>a very limited migration potential, whereas =
NG2<SUP>+</SUP>=20
cells from<SUP> </SUP>the SVZ migrate long distances.<SUP><A=20
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
REF19">19</A></SUP><SUP>=20
</SUP>
<P>The distinguishing characteristic between group I and group<SUP> =
</SUP>II=20
tumors in this study is cortical invasion. What might account<SUP> =
</SUP>for the=20
presence or absence of this phenotype? In their analysis<SUP> </SUP>of=20
asymptomatic mice with early GBMs arising from p53<SUP>-</SUP>,=20
NF1<SUP>-</SUP><SUP> </SUP>astrocytes, Zhu et al.<SUP><A=20
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
REF9">9</A></SUP>=20
demonstrate that not all SVZ-associated<SUP> </SUP>gliomas infiltrate =
the=20
cortex. Perhaps the difference between<SUP> </SUP>the two =
classifications is=20
simply a temporal consequence: Some<SUP> </SUP>human group II GBMs are =
simply=20
group I GBMs that have yet to<SUP> </SUP>reach the cortex at the time of =

imaging. Alternatively, it is<SUP> </SUP>possible that some group II =
GBMs are=20
derived from later-lineage<SUP> </SUP>cells with less migration/invasion =

potential.<SUP> </SUP>
<P>Zhu et al.<SUP><A=20
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
REF9">9</A></SUP>=20
additionally describe mice with gross GBM lesions<SUP> =
</SUP>noncontiguous with=20
the SVZ; in these mice, microscopic cellular<SUP> </SUP>abnormalities =
are=20
present in the SVZ. This pattern of microscopic<SUP> </SUP>SVZ cellular=20
abnormality and distant GBM mass lesion(s) is suggestive<SUP> </SUP>of a =

mechanism in which SVZ tumor stem cells produce migratory<SUP> =
</SUP>tumorigenic=20
daughter cells; these daughter cells take up residence<SUP> </SUP>in =
locations=20
distant from the SVZ, where they then proliferate<SUP> </SUP>to form a =
mass.=20
This migratory tumor progenitor cell hypothesis<SUP><A=20
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
REF15">15</A></SUP><SUP>=20
</SUP>may account for the MRI findings of group III tumors: SVZ =
cellular<SUP>=20
</SUP>abnormalities may be below the threshold of detection by MRI,<SUP> =

</SUP>but the distant mass lesions arising from migratory =
tumorigenic<SUP>=20
</SUP>daughter cells are easily apparent on typical MRI sequences.<SUP>=20
</SUP>Postmortem analysis of patients with group III GBM would be<SUP>=20
</SUP>useful to investigate this hypothesis.<SUP> </SUP>
<P>Our results do not directly address whether GBMs can arise from<SUP>=20
</SUP>the SVZ. It is likely that for GBM there will be different =
cells<SUP>=20
</SUP>of origin, each with different clinical and pathological=20
presentations.<SUP> </SUP>Because it will be difficult to directly =
determine the=20
cell<SUP> </SUP>of origin in humans, it is important to draw parallels=20
between<SUP> </SUP>animal model data and actual human disease. Our =
findings=20
suggest<SUP> </SUP>a testable hypothesis for animal models of glioma, =
that=20
tumors<SUP> </SUP>from NG2<SUP>+</SUP> SVZ cells are more invasive and =
migratory=20
than tumors<SUP> </SUP>induced from NG2<SUP>+</SUP> non-SVZ progenitors. =
Group I=20
GBM may be enriched<SUP> </SUP>for CD133<SUP>+</SUP> tumor stem cells in =

comparison to group IV GBM. It<SUP> </SUP>will also be valuable to =
compare the=20
genomic profile of tumors<SUP> </SUP>in the different GBM groups to =
understand=20
their different biological<SUP> </SUP>behaviors (e.g., cortical =
infiltration=20
between group I and II)<SUP> </SUP>on a molecular level, as well as to =
make=20
comparisons to human<SUP> </SUP>neural stem cells.<SUP> </SUP>
<P>There is great interest in classifying GBMs for prognosis. =
Currently,<SUP>=20
</SUP>age and KPS are the two most significant prognostic =
factors.<SUP><A=20
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
REF20">20</A></SUP><SUP>=20
</SUP>Gene expression profiling holds promise for GBM =
classification;<SUP><A=20
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
REF21">21</A></SUP><SUP>=20
</SUP>however, transcriptional profiling is not performed =
routinely.<SUP>=20
</SUP>In contrast, nearly all patients with GBM are diagnosed and<SUP>=20
</SUP>followed with MRI. Classifying GBMs based on their MRI =
features<SUP>=20
</SUP>may allow a practical yet powerful tool for the assessment of<SUP> =

</SUP>patient prognosis and treatment decisions.<SUP> </SUP>
<P>Despite advances in surgery, radiotherapy, chemotherapy, and<SUP>=20
</SUP>immunotherapy, the median survival for GBM has remained =
between<SUP>=20
</SUP>9 and 12 months.<SUP><A=20
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
REF22">22</A></SUP>=20
The potential of SVZ neural stem cells to<SUP> </SUP>divide =
asymmetrically=20
combined with the migratory potential<SUP> </SUP>of SVZ-derived neural=20
progenitors may contribute to the treatment-resistant<SUP> </SUP>nature =
of=20
GBM.<SUP><A=20
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
REF15">15</A></SUP>=20
Based on our preliminary results, it is possible<SUP> </SUP>that =
patients who=20
present with group I GBM lesions will benefit<SUP> </SUP>from radiation =
therapy=20
that includes distant SVZ locations.<SUP> </SUP>Perhaps group IV GBM =
lesions=20
would be the most amenable to regional<SUP> </SUP>therapy (e.g.,=20
convection-enhanced delivery of immunotoxins),<SUP> </SUP>given that =
this group=20
of tumors recurs only locally. Follow-up<SUP> </SUP>studies will be =
required to=20
conclusively address the clinical<SUP> </SUP>value of MRI for assessing =
GBM SVZ=20
and/or cortical involvement,<SUP> </SUP>but the preliminary results =
presented=20
here appear promising<SUP> </SUP>for this type of tumor analysis.<SUP> =
</SUP>
<P>Received for publication September 1, 2006. Accepted for publication =
January=20
4, 2007.
<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://neuro-oncology.dukejournals.org/icons/toc/rarrow.gif"=20
    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://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
top"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Top<BR></A><A=20
      =
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
ABS"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Abstract<BR></A><A=20
      =
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
BDY"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Introduction<BR></A><A=20
      =
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
SEC1"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Materials and Methods<BR></A><A=20
      =
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
SEC2"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Results<BR></A><A=20
      =
href=3D"http://neuro-oncology.dukejournals.org/cgi/content/full/9/4/424?#=
SEC3"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      =
src=3D"http://neuro-oncology.dukejournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Discussion<BR></A><IMG height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://neuro-oncology.dukejournals.org/icons/toc/dot.gif" =
width=3D11=20
      border=3D0><FONT=20
color=3D#464c53>References</FONT><BR></FONT></TH></TR></TBODY></TABLE>&nb=
sp;<BR><A=20
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------=_NextPart_000_0011_01C85C66.AD46FF70
Content-Type: application/octet-stream
Content-Transfer-Encoding: quoted-printable
Content-Location: http://neuro-oncology.dukejournals.org/javascript/ajax/xmlhttprequest.js

/*=0A=
=0A=
Cross-Browser XMLHttpRequest v1.2=0A=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=0A=
=0A=
Emulate Gecko 'XMLHttpRequest()' functionality in IE and Opera. Opera =
requires=0A=
the Sun Java Runtime Environment <http://www.java.com/>.=0A=
=0A=
by Andrew Gregory=0A=
http://www.scss.com.au/family/andrew/webdesign/xmlhttprequest/=0A=
=0A=
This work is licensed under the Creative Commons Attribution License. To =
view a=0A=
copy of this license, visit =
http://creativecommons.org/licenses/by-sa/2.5/ or=0A=
send a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, =
California=0A=
94305, USA.=0A=
=0A=
Attribution: Leave my name and web address in this script intact.=0A=
=0A=
Not Supported in Opera=0A=
----------------------=0A=
* user/password authentication=0A=
* responseXML data member=0A=
=0A=
Not Fully Supported in Opera=0A=
----------------------------=0A=
* async requests=0A=
* abort()=0A=
* getAllResponseHeaders(), getAllResponseHeader(header)=0A=
=0A=
*/=0A=
// IE support=0A=
if (window.ActiveXObject && !window.XMLHttpRequest) {=0A=
  window.XMLHttpRequest =3D function() {=0A=
    var msxmls =3D new Array(=0A=
      'Msxml2.XMLHTTP.5.0',=0A=
      'Msxml2.XMLHTTP.4.0',=0A=
      'Msxml2.XMLHTTP.3.0',=0A=
      'Msxml2.XMLHTTP',=0A=
      'Microsoft.XMLHTTP');=0A=
    for (var i =3D 0; i < msxmls.length; i++) {=0A=
      try {=0A=
        return new ActiveXObject(msxmls[i]);=0A=
      } catch (e) {=0A=
      }=0A=
    }=0A=
    return null;=0A=
  };=0A=
}=0A=
// Gecko support=0A=
/* ;-) */=0A=
// Opera support=0A=
if (window.opera && !window.XMLHttpRequest) {=0A=
  window.XMLHttpRequest =3D function() {=0A=
    this.readyState =3D 0; // =
0=3Duninitialized,1=3Dloading,2=3Dloaded,3=3Dinteractive,4=3Dcomplete=0A=
    this.status =3D 0; // HTTP status codes=0A=
    this.statusText =3D '';=0A=
    this._headers =3D [];=0A=
    this._aborted =3D false;=0A=
    this._async =3D true;=0A=
    this._defaultCharset =3D 'ISO-8859-1';=0A=
    this._getCharset =3D function() {=0A=
      var charset =3D _defaultCharset;=0A=
      var contentType =3D =
this.getResponseHeader('Content-type').toUpperCase();=0A=
      val =3D contentType.indexOf('CHARSET=3D');=0A=
      if (val !=3D -1) {=0A=
        charset =3D contentType.substring(val);=0A=
      }=0A=
      val =3D charset.indexOf(';');=0A=
      if (val !=3D -1) {=0A=
        charset =3D charset.substring(0, val);=0A=
      }=0A=
      val =3D charset.indexOf(',');=0A=
      if (val !=3D -1) {=0A=
        charset =3D charset.substring(0, val);=0A=
      }=0A=
      return charset;=0A=
    };=0A=
    this.abort =3D function() {=0A=
      this._aborted =3D true;=0A=
    };=0A=
    this.getAllResponseHeaders =3D function() {=0A=
      return this.getAllResponseHeader('*');=0A=
    };=0A=
    this.getAllResponseHeader =3D function(header) {=0A=
      var ret =3D '';=0A=
      for (var i =3D 0; i < this._headers.length; i++) {=0A=
        if (header =3D=3D '*' || this._headers[i].h =3D=3D header) {=0A=
          ret +=3D this._headers[i].h + ': ' + this._headers[i].v + '\n';=0A=
        }=0A=
      }=0A=
      return ret;=0A=
    };=0A=
    this.getResponseHeader =3D function(header) {=0A=
      var ret =3D getAllResponseHeader(header);=0A=
      var i =3D ret.indexOf('\n');=0A=
      if (i !=3D -1) {=0A=
        ret =3D ret.substring(0, i);=0A=
      }=0A=
      return ret;=0A=
    };=0A=
    this.setRequestHeader =3D function(header, value) {=0A=
      this._headers[this._headers.length] =3D {h:header, v:value};=0A=
    };=0A=
    this.open =3D function(method, url, async, user, password) {=0A=
      this.method =3D method;=0A=
      this.url =3D url;=0A=
      this._async =3D true;=0A=
      this._aborted =3D false;=0A=
      this._headers =3D [];=0A=
      if (arguments.length >=3D 3) {=0A=
        this._async =3D async;=0A=
      }=0A=
      if (arguments.length > 3) {=0A=
        opera.postError('XMLHttpRequest.open() - user/password not =
supported');=0A=
      }=0A=
      this.readyState =3D 1;=0A=
      if (this.onreadystatechange) {=0A=
        this.onreadystatechange();=0A=
      }=0A=
    };=0A=
    this.send =3D function(data) {=0A=
      if (!navigator.javaEnabled()) {=0A=
        alert("XMLHttpRequest.send() - Java must be installed and =
enabled.");=0A=
        return;=0A=
      }=0A=
      if (this._async) {=0A=
        setTimeout(this._sendasync, 0, this, data);=0A=
        // this is not really asynchronous and won't execute until the =
current=0A=
        // execution context ends=0A=
      } else {=0A=
        this._sendsync(data);=0A=
      }=0A=
    }=0A=
    this._sendasync =3D function(req, data) {=0A=
      if (!req._aborted) {=0A=
        req._sendsync(data);=0A=
      }=0A=
    };=0A=
    this._sendsync =3D function(data) {=0A=
      this.readyState =3D 2;=0A=
      if (this.onreadystatechange) {=0A=
        this.onreadystatechange();=0A=
      }=0A=
      // open connection=0A=
      var url =3D new java.net.URL(new =
java.net.URL(window.location.href), this.url);=0A=
      var conn =3D url.openConnection();=0A=
      for (var i =3D 0; i < this._headers.length; i++) {=0A=
        conn.setRequestProperty(this._headers[i].h, this._headers[i].v);=0A=
      }=0A=
      this._headers =3D [];=0A=
      if (this.method =3D=3D 'POST') {=0A=
        // POST data=0A=
        conn.setDoOutput(true);=0A=
        var wr =3D new =
java.io.OutputStreamWriter(conn.getOutputStream(), this._getCharset());=0A=
        wr.write(data);=0A=
        wr.flush();=0A=
        wr.close();=0A=
      }=0A=
      // read response headers=0A=
      // NOTE: the getHeaderField() methods always return nulls for me :(=0A=
      var gotContentEncoding =3D false;=0A=
      var gotContentLength =3D false;=0A=
      var gotContentType =3D false;=0A=
      var gotDate =3D false;=0A=
      var gotExpiration =3D false;=0A=
      var gotLastModified =3D false;=0A=
      for (var i =3D 0; ; i++) {=0A=
        var hdrName =3D conn.getHeaderFieldKey(i);=0A=
        var hdrValue =3D conn.getHeaderField(i);=0A=
        if (hdrName =3D=3D null && hdrValue =3D=3D null) {=0A=
          break;=0A=
        }=0A=
        if (hdrName !=3D null) {=0A=
          this._headers[this._headers.length] =3D {h:hdrName, =
v:hdrValue};=0A=
          switch (hdrName.toLowerCase()) {=0A=
            case 'content-encoding': gotContentEncoding =3D true; break;=0A=
            case 'content-length'  : gotContentLength   =3D true; break;=0A=
            case 'content-type'    : gotContentType     =3D true; break;=0A=
            case 'date'            : gotDate            =3D true; break;=0A=
            case 'expires'         : gotExpiration      =3D true; break;=0A=
            case 'last-modified'   : gotLastModified    =3D true; break;=0A=
          }=0A=
        }=0A=
      }=0A=
      // try to fill in any missing header information=0A=
      var val;=0A=
      val =3D conn.getContentEncoding();=0A=
      if (val !=3D null && !gotContentEncoding) =
this._headers[this._headers.length] =3D {h:'Content-encoding', v:val};=0A=
      val =3D conn.getContentLength();=0A=
      if (val !=3D -1 && !gotContentLength) =
this._headers[this._headers.length] =3D {h:'Content-length', v:val};=0A=
      val =3D conn.getContentType();=0A=
      if (val !=3D null && !gotContentType) =
this._headers[this._headers.length] =3D {h:'Content-type', v:val};=0A=
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      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=
      var stream =3D conn.getInputStream();=0A=
      if (stream) {=0A=
        var reader =3D new java.io.BufferedReader(new =
java.io.InputStreamReader(stream, this._getCharset()));=0A=
        var line;=0A=
        while ((line =3D reader.readLine()) !=3D null) {=0A=
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            this.readyState =3D 3;=0A=
            if (this.onreadystatechange) {=0A=
              this.onreadystatechange();=0A=
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          }=0A=
          reqdata +=3D line + '\n';=0A=
        }=0A=
        reader.close();=0A=
        this.status =3D 200;=0A=
        this.statusText =3D 'OK';=0A=
        this.responseText =3D reqdata;=0A=
        this.readyState =3D 4;=0A=
        if (this.onreadystatechange) {=0A=
          this.onreadystatechange();=0A=
        }=0A=
        if (this.onload) {=0A=
          this.onload();=0A=
        }=0A=
      } else {=0A=
        // error=0A=
        this.status =3D 404;=0A=
        this.statusText =3D 'Not Found';=0A=
        this.responseText =3D '';=0A=
        this.readyState =3D 4;=0A=
        if (this.onreadystatechange) {=0A=
          this.onreadystatechange();=0A=
        }=0A=
        if (this.onerror) {=0A=
          this.onerror();=0A=
        }=0A=
      }=0A=
    };=0A=
  };=0A=
}=0A=
// ActiveXObject emulation=0A=
if (!window.ActiveXObject && window.XMLHttpRequest) {=0A=
  window.ActiveXObject =3D function(type) {=0A=
    switch (type.toLowerCase()) {=0A=
      case 'microsoft.xmlhttp':=0A=
      case 'msxml2.xmlhttp':=0A=
      case 'msxml2.xmlhttp.3.0':=0A=
      case 'msxml2.xmlhttp.4.0':=0A=
      case 'msxml2.xmlhttp.5.0':=0A=
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}=0A=

------=_NextPart_000_0011_01C85C66.AD46FF70
Content-Type: application/octet-stream
Content-Transfer-Encoding: quoted-printable
Content-Location: http://neuro-oncology.dukejournals.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=
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	  copy_xml_to_html(src.childNodes[i], e);=0A=
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    for (var i =3D 0; i < src.attributes.length; i++) {=0A=
      var n =3D src.attributes[i].name;=0A=
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      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=
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}=0A=
=0A=
/*=0A=
 * Parse set of CSS rules and apply them to an element.=0A=
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 * or use e.style.setProperty(rule, value, priority),=0A=
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function set_css_style(css, e, priority) {=0A=
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        if (name =3D=3D "background") {=0A=
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        }=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=
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        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=
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        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=
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          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=
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          e.style.borderLeftColor =3D value;=0A=
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          e.style.borderLeftStyle =3D value;=0A=
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------=_NextPart_000_0011_01C85C66.AD46FF70
Content-Type: application/octet-stream
Content-Transfer-Encoding: quoted-printable
Content-Location: http://neuro-oncology.dukejournals.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=
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=0A=
  /*=0A=
   * Acquire table row element to update, initiate callback=0A=
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   */=0A=
  var tr =3D document.getElementById('entrez_callback_'+pmid);=0A=
  if (!tr) {=0A=
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      var tbl =3D tr.parentNode;=0A=
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  req.open('GET', callback_url, true);=0A=
  req.send(null);=0A=
}=0A=

------=_NextPart_000_0011_01C85C66.AD46FF70--

