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Subject: Oligodendrogliomas: Molecular Biology and Treatment -- Bromberg and van den Bent 14 (2): 155 -- The Oncologist
Date: Mon, 2 Mar 2009 18:39:16 +0100
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<TABLE cellSpacing=3D0 cellPadding=3D0>
  <TBODY>
  <TR>
    <TD>
      <HR SIZE=3D1 noShade>

      <H3>Neuro-Oncology</H3></TD></TR></TBODY></TABLE>
<H2>Oligodendrogliomas: Molecular Biology and=20
Treatment</H2><STRONG></NOBR><NOBR>Jacolien E. C. =
Bromberg<SUP></SUP></NOBR>,=20
<NOBR>Martin J. van den Bent<SUP></SUP></NOBR> </STRONG>
<P><FONT size=3D-1>Neuro-Oncology Unit, Daniel den Hoed Cancer =
Center/Erasmus=20
University Medical Center, Rotterdam, The Netherlands </FONT>
<P><STRONG>Key Words. </STRONG>Oligodendroglioma =95 Oligoastrocytoma =
=95 1p =95 19q =95=20
<I>MGMT</I> =95 Temozolomide
<P>Correspondence: Martin J. van den Bent, M.D., Neuro-Oncology Unit, =
Daniel den=20
Hoed Cancer Center/Erasmus University Medical Center, PO Box 5201, =
3008AE=20
Rotterdam, The Netherlands. Telephone: 31-10-4391415; Fax: =
31-10-4391031;=20
e-mail: <SPAN id=3Dem0>m.vandenbent{at}erasmusmc.nl</SPAN>
<SCRIPT type=3Dtext/javascript><!--=0A=
 var u =3D "m.vandenbent", d =3D "erasmusmc.nl"; =
document.getElementById("em0").innerHTML =3D '<a href=3D"mailto:' + u + =
'@' + d + '">' + u + '@' + d + '<\/a>'//--></SCRIPT>
</FONT>
<P>Received November 14, 2008; accepted for publication January 12, =
2009; first=20
published online in <EM><STRONG>THE ONCOLOGIST Express</STRONG></EM> on =
January=20
31, 2009.
<P><B>Disclosures</B><SUP> </SUP><BR><SUP></SUP><BR><B>Jacolien E. C.=20
Bromberg:</B> None; <B>Martin J. van den Bent:</B><I>Consultant/advisory =

role:</I> Schering Plough; <I>Honoraria:</I> Schering Plough.<SUP>=20
</SUP><BR><SUP></SUP><BR>Section editors <B>Jean-Yves Delattre</B> and =
<B>Tracy=20
Batchelor</B> have disclosed no financial relationships relevant to the =
content=20
of this article.<SUP> </SUP><BR><SUP></SUP><BR>The content of this =
article has=20
been reviewed by independent peer reviewers to ensure that it is =
balanced,=20
objective, and free from commercial bias.<SUP>=20
</SUP><BR><SUP></SUP><BR><B>Target audience:</B> Physicians who wish to =
advance=20
their current knowledge of clinical cancer medicine in neuro-oncology.
<P><STRONG><A name=3DSEC1><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD bgColor=3D#ffffff vAlign=3Dcenter width=3D"5%" align=3Dleft><IMG =
hspace=3D5=20
      alt=3D" " =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/rarrow.gif"=20
      width=3D10 height=3D21></TD>
    <TH vAlign=3Dcenter width=3D"95%" align=3Dleft><FONT =
size=3D+2>&nbsp;&nbsp;=20
      Learning Objectives </FONT></TH></TR></TBODY></TABLE>
<TABLE border=3D1 cellPadding=3D5 align=3Dright>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
top"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Top<BR></A><IMG border=3D0 hspace=3D5 alt=3D" "=20
      src=3D"http://theoncologist.alphamedpress.org/icons/toc/dot.gif" =
width=3D11=20
      height=3D9><FONT color=3D#464c53>Learning Objectives</FONT><BR><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
ABS"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Abstract<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC2"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Introduction<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC3"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Histology<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC4"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Reliability of the Histological...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC5"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Genetics: 1p/19q Codeletion and...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC6"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Histomorphology and 1p/19q...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC7"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Other Genetic Aberrations<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC8"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Methyl Guanine Methyltransferase...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC9"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Why Are 1p/19q Codeleted...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC10"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Is 1p/19q Codeletion Predictive...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC11"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Treatment of Low-Grade Tumors<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC12"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Treatment of Anaplastic Tumors<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC13"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Conclusions<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC14"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Author Contributions<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
BIBL"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      =
height=3D9>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>
<OL type=3D1>
  <LI>Evaluate the current challenges in the histological diagnosis<SUP> =

  </SUP>of oligodendroglial tumors and apply best practices to =
optimize<SUP>=20
  </SUP>patient outcomes.<SUP> </SUP><BR>
  <LI>Analyze the molecular alterations in different<SUP> </SUP>subsets =
of=20
  tumors<SUP> </SUP>with oligodendroglial morphology.<SUP> </SUP><BR>
  <LI>Formulate<SUP> </SUP>treatment options for your patients with =
newly=20
  diagnosed<SUP> </SUP>and<SUP> </SUP>recurrent oligodendroglial =
tumors.<SUP>=20
  </SUP><BR></LI></OL><SUP></SUP>
<P>This article is available for continuing medical education =
credit<SUP>=20
</SUP>at <A =
href=3D"http://cme.theoncologist.com/">CME.TheOncologist.com</A>.<SUP>=20
</SUP>
<P></STRONG>
<P><A name=3DABS><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
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    <TD bgColor=3D#ffffff vAlign=3Dcenter width=3D"5%" align=3Dleft><IMG =
hspace=3D5=20
      alt=3D" " =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/rarrow.gif"=20
      width=3D10 height=3D21></TD>
    <TH vAlign=3Dcenter width=3D"95%" align=3Dleft><FONT =
size=3D+2>&nbsp;&nbsp; A<FONT=20
      size=3D-2>BSTRACT</FONT> </FONT></TH></TR></TBODY></TABLE>
<TABLE border=3D1 cellPadding=3D5 align=3Dright>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
top"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Top<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC1"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Learning Objectives<BR></A><IMG border=3D0 hspace=3D5 =
alt=3D" "=20
      src=3D"http://theoncologist.alphamedpress.org/icons/toc/dot.gif" =
width=3D11=20
      height=3D9><FONT color=3D#464c53>Abstract</FONT><BR><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC2"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Introduction<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC3"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Histology<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC4"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Reliability of the Histological...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC5"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Genetics: 1p/19q Codeletion and...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC6"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Histomorphology and 1p/19q...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC7"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Other Genetic Aberrations<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC8"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Methyl Guanine Methyltransferase...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC9"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Why Are 1p/19q Codeleted...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC10"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Is 1p/19q Codeletion Predictive...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC11"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Treatment of Low-Grade Tumors<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC12"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Treatment of Anaplastic Tumors<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC13"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Conclusions<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC14"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Author Contributions<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
BIBL"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      =
height=3D9>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR><=
STRONG>Oligodendroglial=20
tumors continue to receive much attention because<SUP> </SUP>of their =
relative=20
sensitivity to chemotherapy. The histological<SUP> </SUP>diagnosis of=20
oligodendroglial tumors is subject to considerable<SUP> =
</SUP>interobserver=20
variation. The revised 2007 World Health Organization<SUP> =
</SUP>classification=20
of brain tumors no longer accepts the diagnosis<SUP> </SUP>"mixed =
anaplastic=20
oligoastrocytoma" if necrosis is present;<SUP> </SUP>these tumors should =
be=20
considered glioblastomas (perhaps with<SUP> </SUP>oligodendroglial =
features).=20
The 1p/19q codeletion that is associated<SUP> </SUP>with sensitivity to=20
chemotherapy is mediated by an unbalanced<SUP> </SUP>translocation of =
19p to 1q.=20
Randomized studies have shown that<SUP> </SUP>patients with 1p/19q =
codeleted=20
tumors also have a better outcome<SUP> </SUP>with radiotherapy. =
Histologically=20
more atypical tumors are less<SUP> </SUP>likely to have this 1p/19q =
codeletion;=20
here, other alterations<SUP> </SUP>usually associated with astrocytic =
tumors are=20
often found. Some<SUP> </SUP>patients with tumors with classic =
histological=20
features but<SUP> </SUP>no 1p/19q codeletion still have a very favorable =

prognosis.<SUP> </SUP>
<P>Currently, the best approach for newly diagnosed anaplastic<SUP>=20
</SUP>oligodendroglial tumors is unclear. Early adjuvant =
chemotherapy<SUP>=20
</SUP>does not provide a better outcome than chemotherapy at the =
time<SUP>=20
</SUP>of progression. The value of combined chemoirradiation with<SUP>=20
</SUP>temozolomide has not been proven in these tumors, and could<SUP> =
</SUP>at=20
least theoretically be associated with greater neurotoxicity.<SUP> =
</SUP>Tumors=20
with 1p and 19q loss can also be managed with early chemotherapy,<SUP>=20
</SUP>while deferring radiotherapy to the time of further =
progression.<SUP>=20
</SUP>The presently available second-line chemotherapy results are<SUP>=20
</SUP>modest, and better salvage treatments are necessary. The =
molecular<SUP>=20
</SUP>explanation for the greater sensitivity of 1p/19q codeleted<SUP>=20
</SUP>tumors is still unclear, and this could, in part, be =
explained<SUP>=20
</SUP>by more frequent <I>MGMT</I> promoter gene methylation.<SUP> =
</SUP>
<P></STRONG><A name=3DSEC2><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD bgColor=3D#ffffff vAlign=3Dcenter width=3D"5%" align=3Dleft><IMG =
hspace=3D5=20
      alt=3D" " =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/rarrow.gif"=20
      width=3D10 height=3D21></TD>
    <TH vAlign=3Dcenter width=3D"95%" align=3Dleft><FONT =
size=3D+2>&nbsp;&nbsp; I<FONT=20
      size=3D-2>NTRODUCTION</FONT> </FONT></TH></TR></TBODY></TABLE>
<TABLE border=3D1 cellPadding=3D5 align=3Dright>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
top"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Top<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC1"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Learning Objectives<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
ABS"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Abstract<BR></A><IMG border=3D0 hspace=3D5 alt=3D" "=20
      src=3D"http://theoncologist.alphamedpress.org/icons/toc/dot.gif" =
width=3D11=20
      height=3D9><FONT color=3D#464c53>Introduction</FONT><BR><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC3"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Histology<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC4"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Reliability of the Histological...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC5"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Genetics: 1p/19q Codeletion and...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC6"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Histomorphology and 1p/19q...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC7"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Other Genetic Aberrations<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC8"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Methyl Guanine Methyltransferase...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC9"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Why Are 1p/19q Codeleted...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC10"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Is 1p/19q Codeletion Predictive...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC11"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Treatment of Low-Grade Tumors<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC12"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Treatment of Anaplastic Tumors<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC13"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Conclusions<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC14"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Author Contributions<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
BIBL"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      =
height=3D9>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>O=
ligodendroglioma=20
(OD) and mixed oligoastrocytoma (OA) constitute<SUP> </SUP>5%=9620% of =
all glial=20
tumors. They are predominantly tumors<SUP> </SUP>of adulthood, with a =
peak=20
incidence between the fourth and sixth<SUP> </SUP>decade of life; =
low-grade ODs=20
tend to arise in slightly younger<SUP> </SUP>patients. Until some 15 =
years ago,=20
the diagnosis of OD was merely<SUP> </SUP>a pathological entity, which =
changed=20
with the recognition of<SUP> </SUP>the marked sensitivity to =
procarbazine,=20
lomustine, and vincristine<SUP> </SUP>(PCV) chemotherapy of these tumors =
[<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B1">1</A>,=20
<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B2">2</A>].=20
A second development<SUP> </SUP>was the identification of the combined =
loss of=20
the short arm<SUP> </SUP>of chromosome 1 (1p) and the long arm of =
chromosome 19=20
(19q)<SUP> </SUP>as the typical genetic lesions of OD, occurring in =
60%=9690%<SUP>=20
</SUP>of ODs [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B3">3</A>=96<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B6">6</A>].=20
This was followed by the recognition that<SUP> </SUP>these 1p/19q =
codeleted=20
tumors, in particular, have an excellent<SUP> </SUP>response to =
chemotherapy [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B4">4</A>,=20
<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B7">7</A>=96<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B9">9</A>].=20
Patients with ODs with<SUP> </SUP>the combined loss of 1p and 19q not =
only have=20
a better response<SUP> </SUP>to chemotherapy, they also have a more =
indolent=20
clinical course<SUP> </SUP>and a longer lasting response to radiotherapy =
(RT).=20
These observations<SUP> </SUP>have led to the current tendency to =
consider 1p=20
and 19q loss<SUP> </SUP>low-grade OD and anaplastic oligodendroglioma =
(AOD) as a=20
separate<SUP> </SUP>biological entity, at least within clinical trials =
[<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B8">8</A>,=20
<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B10">10</A>].<SUP>=20
</SUP>New data at least question this assumption.<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 bgColor=3D#ffffff vAlign=3Dcenter width=3D"5%" align=3Dleft><IMG =
hspace=3D5=20
      alt=3D" " =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/rarrow.gif"=20
      width=3D10 height=3D21></TD>
    <TH vAlign=3Dcenter width=3D"95%" align=3Dleft><FONT =
size=3D+2>&nbsp;&nbsp; H<FONT=20
      size=3D-2>ISTOLOGY</FONT> </FONT></TH></TR></TBODY></TABLE>
<TABLE border=3D1 cellPadding=3D5 align=3Dright>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
top"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Top<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC1"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Learning Objectives<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
ABS"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Abstract<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC2"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Introduction<BR></A><IMG border=3D0 hspace=3D5 alt=3D" =
"=20
      src=3D"http://theoncologist.alphamedpress.org/icons/toc/dot.gif" =
width=3D11=20
      height=3D9><FONT color=3D#464c53>Histology</FONT><BR><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC4"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Reliability of the Histological...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC5"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Genetics: 1p/19q Codeletion and...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC6"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Histomorphology and 1p/19q...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC7"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Other Genetic Aberrations<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC8"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Methyl Guanine Methyltransferase...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC9"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Why Are 1p/19q Codeleted...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC10"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Is 1p/19q Codeletion Predictive...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC11"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Treatment of Low-Grade Tumors<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC12"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Treatment of Anaplastic Tumors<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC13"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Conclusions<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC14"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Author Contributions<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
BIBL"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      =
height=3D9>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>T=
he=20
current World Health Organization (WHO) definition of OD<SUP> </SUP>is =
"a=20
well-differentiated, diffusely infiltrating tumor of adults,<SUP>=20
</SUP>typically located in the cerebral hemispheres and composed=20
predominantly<SUP> </SUP>of cells morphologically resembling =
oligodendroglia"=20
[<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B11">11</A>].=20
By<SUP> </SUP>definition, mixed OA tumors have morphologic =
characteristics<SUP>=20
</SUP>of both astrocytic tumors and pure ODs. Recent European =
Organization<SUP>=20
</SUP>for Research and Treatment of Cancer (EORTC) and Radiation =
Therapy<SUP>=20
</SUP>Oncology Group (RTOG) trials used the presence of 25%=20
oligodendroglial<SUP> </SUP>elements as the arbitrary cutoff point for =
the=20
diagnosis of<SUP> </SUP>a mixed tumor. Since the results of one study =
that noted=20
that<SUP> </SUP>the outcome of patients with mixed anaplastic=20
oligoastrocytoma<SUP> </SUP>(AOA) with necrosis was similar to that of=20
glioblastoma patients<SUP> </SUP>were available, the recent 2007 WHO=20
classification of brain<SUP> </SUP>tumors no longer accepts the =
diagnosis of=20
mixed OA if necrosis<SUP> </SUP>is present [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B6">6</A>,=20
<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B12">12</A>].=20
These tumors are now considered amongst<SUP> </SUP>the glioblastomas, =
perhaps=20
with the addition of "with oligodendroglial<SUP> </SUP>features." =
Whether or not=20
there is any clinical significance,<SUP> </SUP>however, to identifying =
such=20
oligodendroglial components in<SUP> </SUP>glioblastomas is unclear. =
Previous=20
studies have shown that these<SUP> </SUP>tumors do indeed have a =
molecular=20
pattern comparable with that<SUP> </SUP>of glioblastoma, with epidermal =
growth=20
factor receptor gene<SUP> </SUP>(<I>EGFR</I>) amplification, phosphatase =
and=20
tensin homologue deleted<SUP> </SUP>on chromosome 10 gene (<I>PTEN</I>)=20
mutations, and loss of chromosome<SUP> </SUP>10, but rarely combined 1p =
and 19q=20
loss [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B13">13</A>=96<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B15">15</A>].=20
Of note,<SUP> </SUP>however, another large study did report somewhat =
better=20
survival<SUP> </SUP>in patients with so-called grade 4 OAs (the =
diagnosis of=20
which<SUP> </SUP>required necrosis) than in glioblastoma patients [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B16">16</A>].=20
The median<SUP> </SUP>survival time in the AOA grade 4 group was 15.6 =
months,=20
compared<SUP> </SUP>with 10.9 months in the glioblastoma group.<SUP> =
</SUP>
<P>In pure AOD, the impact of necrosis is unclear. Miller et al.<SUP> =
</SUP>[<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B6">6</A>]=20
did not find any impact of necrosis in pure AOD, nor did<SUP> </SUP>a =
review=20
analysis of the North American prospective randomized<SUP> </SUP>study =
on=20
oligodendroglial tumors [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B17">17</A>].=20
In contrast, a similar<SUP> </SUP>European study found that both =
endothelial=20
proliferation and<SUP> </SUP>necrosis were related to survival in AOD =
patients=20
[<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B18">18</A>].=20
These<SUP> </SUP>subtle differences may be related to differences in the =

rather<SUP> </SUP>subjective histological criteria. From all studies, it =
is=20
clear<SUP> </SUP>though that the outcome of AOD patients, even with=20
necrosis,<SUP> </SUP>remains distinctly better than that of glioblastoma =

patients,<SUP> </SUP>which is not the case for mixed AOAs with =
necrosis.<SUP>=20
</SUP>
<P><A name=3DSEC4><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD bgColor=3D#ffffff vAlign=3Dcenter width=3D"5%" align=3Dleft><IMG =
hspace=3D5=20
      alt=3D" " =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/rarrow.gif"=20
      width=3D10 height=3D21></TD>
    <TH vAlign=3Dcenter width=3D"95%" align=3Dleft><FONT =
size=3D+2>&nbsp;&nbsp; R<FONT=20
      size=3D-2>ELIABILITY</FONT><FONT size=3D-1> </FONT><FONT=20
      size=3D-2>OF</FONT><FONT size=3D-1> </FONT><FONT =
size=3D-2>THE</FONT> H<FONT=20
      size=3D-2>ISTOLOGICAL</FONT> D<FONT size=3D-2>IAGNOSIS</FONT>=20
  </FONT></TH></TR></TBODY></TABLE>
<TABLE border=3D1 cellPadding=3D5 align=3Dright>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
top"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Top<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC1"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Learning Objectives<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
ABS"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Abstract<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC2"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Introduction<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC3"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Histology<BR></A><IMG border=3D0 hspace=3D5 alt=3D" "=20
      src=3D"http://theoncologist.alphamedpress.org/icons/toc/dot.gif" =
width=3D11=20
      height=3D9><FONT color=3D#464c53>Reliability of the=20
      Histological...</FONT><BR><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC5"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Genetics: 1p/19q Codeletion and...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC6"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Histomorphology and 1p/19q...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC7"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Other Genetic Aberrations<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC8"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Methyl Guanine Methyltransferase...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC9"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Why Are 1p/19q Codeleted...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC10"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Is 1p/19q Codeletion Predictive...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC11"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Treatment of Low-Grade Tumors<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC12"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Treatment of Anaplastic Tumors<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC13"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Conclusions<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC14"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Author Contributions<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
BIBL"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      =
height=3D9>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>S=
everal=20
studies have shown that considerable interobserver variation<SUP> =
</SUP>is=20
present in the diagnosis of grade III tumors, including =
oligodendroglial<SUP>=20
</SUP>tumors. In one project, 114 samples from a large prospective<SUP>=20
</SUP>European trial were reviewed by nine independent pathologists<SUP> =

</SUP>[<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B19">19</A>].=20
The panel reached consensus (six or more of the nine agreeing<SUP> =
</SUP>on the=20
diagnosis) on the diagnosis of AOD in 52% of the tumors<SUP> </SUP>that =
had been=20
diagnosed as AOD by the local pathologists, whereas<SUP> </SUP>only 8% =
of the=20
local diagnoses of AOA were confirmed with consensus.<SUP> </SUP>The =
<IMG=20
border=3D0 alt=3D{kappa}=20
src=3D"http://theoncologist.alphamedpress.org/math/kappa.gif"> =
coefficients of the=20
individual panelists for the 52 cases<SUP> </SUP>with a consensus =
diagnosis of=20
AOD were in the range of 0.46=960.72.<SUP> </SUP>A similar study on the =
North=20
American randomized study investigated<SUP> </SUP>the interobserver =
variation in=20
the diagnosis of "classical for<SUP> </SUP>oligodendroglioma" (CFO) =
(loosely=20
defined as round regular nuclei,<SUP> </SUP>monomorphic appearance, =
perinuclear=20
haloes, etc.) among experienced<SUP> </SUP>neuropathologists (<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
F1">Fig.=20
1</A>) [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B17">17</A>].=20
Tumor specimens from 247 patients<SUP> </SUP>were available for this =
review.=20
Although the authors considered<SUP> </SUP>the outcome of the study =
supportive=20
of an approach to clinical<SUP> </SUP>trials on OD, in which patients =
can only=20
be included after central<SUP> </SUP>review, the interobserver agreement =
was=20
only modest (<IMG border=3D0 alt=3D{kappa}=20
src=3D"http://theoncologist.alphamedpress.org/math/kappa.gif"> =3D =
0.55),<SUP>=20
</SUP>and one reviewer did not identify 22% of the CFO cases =
identified<SUP>=20
</SUP>by consensus. In the above-mentioned study on CFO, which used<SUP> =

</SUP>five independent reviewers, a consensus diagnosis (four of =
five<SUP>=20
</SUP>neuropathologists agreeing) was obtained in 83% of cases. In<SUP>=20
</SUP>another series, a rather high degree of agreement was =
reported<SUP>=20
</SUP>[<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B20">20</A>].=20
Most likely, close interaction among pathologists leads<SUP> </SUP>to a =
better=20
diagnostic agreement, although that holds an element<SUP> </SUP>of =
subjectivity=20
(e.g., within that specific group).<SUP> </SUP>
<P><SUP></SUP>
<P><A name=3DF1><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
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          <TD bgColor=3D#ffffff vAlign=3Dtop align=3Dmiddle><A=20
            =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155/=
F1"><IMG=20
            border=3D2 hspace=3D10 alt=3D"Figure 1" vspace=3D5=20
            =
src=3D"http://theoncologist.alphamedpress.org/content/vol14/issue2/images=
/small/onc0020903650001.gif"=20
            width=3D200 height=3D150></A><BR><STRONG>View larger =
version</STRONG>=20
            (176K):<BR><NOBR><A=20
            =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155/=
F1">[in=20
            this window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('F1', 590, 530); =
this.href=3D'/cgi/content-nw/full/14/2/155/F1'"=20
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55/F1"=20
            target=3DF1>[in a new window]</A><BR><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><B>Figure 1.</B> Classic =
oligodendroglial=20
            tumor, with fried egg appearance (which actually is an =
artificial=20
            fixation artifact).
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR><A=20
name=3DSEC5><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
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    <TD bgColor=3D#ffffff vAlign=3Dcenter width=3D"5%" align=3Dleft><IMG =
hspace=3D5=20
      alt=3D" " =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/rarrow.gif"=20
      width=3D10 height=3D21></TD>
    <TH vAlign=3Dcenter width=3D"95%" align=3Dleft><FONT =
size=3D+2>&nbsp;&nbsp; G<FONT=20
      size=3D-2>ENETICS</FONT>: 1<FONT size=3D-2>P</FONT>/19<FONT =
size=3D-2>Q</FONT>=20
      C<FONT size=3D-2>ODELETION</FONT><FONT size=3D-1> </FONT><FONT=20
      size=3D-2>AND</FONT> T<FONT size=3D-2>RANSLOCATION</FONT>=20
</FONT></TH></TR></TBODY></TABLE>
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    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
top"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Top<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC1"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Learning Objectives<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
ABS"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Abstract<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC2"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Introduction<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC3"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Histology<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC4"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Reliability of the Histological...<BR></A><IMG =
border=3D0 hspace=3D5=20
      alt=3D" " =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/dot.gif"=20
      width=3D11 height=3D9><FONT color=3D#464c53>Genetics: 1p/19q =
Codeletion=20
      and...</FONT><BR><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC6"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Histomorphology and 1p/19q...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC7"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Other Genetic Aberrations<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC8"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Methyl Guanine Methyltransferase...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC9"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Why Are 1p/19q Codeleted...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC10"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Is 1p/19q Codeletion Predictive...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC11"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Treatment of Low-Grade Tumors<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC12"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Treatment of Anaplastic Tumors<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC13"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Conclusions<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC14"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Author Contributions<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
BIBL"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      =
height=3D9>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>I=
t was=20
recently demonstrated that the combined loss of 1p and<SUP> </SUP>19q is =

mediated by an unbalanced translocation of 19p to 1q<SUP> </SUP>[<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B21">21</A>,=20
<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B22">22</A>].=20
Most likely, a centrosomal or pericentrosomal translocation<SUP> =
</SUP>of=20
chromosomes 1 and 19 results in two derivative chromosomes,<SUP>=20
</SUP>der(1,19)(p10;q10) and der(1,19)(q10;p10), after which the =
derivative<SUP>=20
</SUP>chromosome with the short arm of chromosome 1 and the long =
arm<SUP>=20
</SUP>of chromosome 19 is lost. A possible explanation for this=20
translocation<SUP> </SUP>is the strong homology of the centromeric =
regions of=20
chromosomes<SUP> </SUP>1 and 19. For the analysis of 1p loss in OD, it =
is=20
important<SUP> </SUP>that the loss of the entire short arm of chromosome =
1 is=20
assessed.<SUP> </SUP>Partial 1p deletions do occur in glioblastoma, are =
not=20
associated<SUP> </SUP>with 19q loss, and carry a poor prognostic =
significance=20
[<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B23">23</A>].<SUP>=20
</SUP>Because fluorescence in situ hybridization probes used to =
assess<SUP>=20
</SUP>1p loss are often located on 1p36.6, one needs to be aware =
that<SUP>=20
</SUP>this will also pick up loss of the tip of 1p. In tumors in =
which<SUP>=20
</SUP>codeletion of 1p and 19q is present, the codeletion is =
generally<SUP>=20
</SUP>distributed throughout the tumor, even in areas with more =
astrocytic<SUP>=20
</SUP>morphology [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B24">24</A>].=20
Furthermore, the loss of 1p and 19q is retained<SUP> </SUP>at the time =
of=20
progression, regardless of morphological changes,<SUP> </SUP>suggesting =
that=20
1p/19q loss is an early genetic event [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B15">15</A>,=20
<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B25">25</A>].<SUP>=20
</SUP>
<P><A name=3DSEC6><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD bgColor=3D#ffffff vAlign=3Dcenter width=3D"5%" align=3Dleft><IMG =
hspace=3D5=20
      alt=3D" " =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/rarrow.gif"=20
      width=3D10 height=3D21></TD>
    <TH vAlign=3Dcenter width=3D"95%" align=3Dleft><FONT =
size=3D+2>&nbsp;&nbsp; H<FONT=20
      size=3D-2>ISTOMORPHOLOGY</FONT><FONT size=3D-1> </FONT><FONT=20
      size=3D-2>AND</FONT> 1<FONT size=3D-2>P</FONT>/19<FONT =
size=3D-2>Q</FONT> C<FONT=20
      size=3D-2>ODELETION</FONT> </FONT></TH></TR></TBODY></TABLE>
<TABLE border=3D1 cellPadding=3D5 align=3Dright>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
top"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Top<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC1"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Learning Objectives<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
ABS"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Abstract<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC2"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Introduction<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC3"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Histology<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC4"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Reliability of the Histological...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC5"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Genetics: 1p/19q Codeletion and...<BR></A><IMG =
border=3D0 hspace=3D5=20
      alt=3D" " =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/dot.gif"=20
      width=3D11 height=3D9><FONT color=3D#464c53>Histomorphology and=20
      1p/19q...</FONT><BR><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC7"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Other Genetic Aberrations<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC8"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Methyl Guanine Methyltransferase...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC9"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Why Are 1p/19q Codeleted...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC10"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Is 1p/19q Codeletion Predictive...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC11"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Treatment of Low-Grade Tumors<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC12"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Treatment of Anaplastic Tumors<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC13"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Conclusions<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC14"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Author Contributions<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
BIBL"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      =
height=3D9>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>A=
 clear=20
association exists between codeletion of 1p and 19q<SUP> </SUP>and a =
classic=20
histological appearance (perinuclear halo, chicken-wire<SUP> =
</SUP>vascular=20
pattern) [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B8">8</A>,=20
<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B17">17</A>,=20
<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B26">26</A>].=20
The 1p/19q codeletion is present<SUP> </SUP>in 61%=9689% of AOD cases, =
but in only=20
13%=9620% of<SUP> </SUP>patients with AOA [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B6">6</A>,=20
<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B27">27</A>].=20
Of note, McDonald et al. [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B27">27</A>]=20
confirmed<SUP> </SUP>the close association between CFO and 1p/19q =
codeletion,=20
with<SUP> </SUP>a higher likelihood of 1p and 19q loss if more =
pathologists<SUP>=20
</SUP>judged the tumor to be CFO. In mixed OAs with predominant=20
oligodendroglial<SUP> </SUP>morphology, the percentage of tumors showing =
1p and=20
19q loss<SUP> </SUP>drops to 39%, emphasizing that even the presence of =
minor=20
astrocytic<SUP> </SUP>elements significantly reduces the chance of =
finding 1p=20
and<SUP> </SUP>19q loss [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B15">15</A>].<SUP>=20
</SUP>
<P>Still, some atypical ODs have 1p/19q codeletions and some =
typical<SUP>=20
</SUP>ODs do not show 1p and 19q loss. However, the outcome of =
patients<SUP>=20
</SUP>with non-1p/19q codeleted tumors but with typical =
histological<SUP>=20
</SUP>appearance was reported to be equally favorable in a large=20
prospective<SUP> </SUP>U.S. trial [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B17">17</A>].=20
Another study reported loss of 1p and 19q to<SUP> </SUP>be related, in=20
particular, to outcome in patients with tumors<SUP> </SUP>with classic=20
histologic features [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B27">27</A>].<SUP>=20
</SUP>
<P><A name=3DSEC7><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD bgColor=3D#ffffff vAlign=3Dcenter width=3D"5%" align=3Dleft><IMG =
hspace=3D5=20
      alt=3D" " =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/rarrow.gif"=20
      width=3D10 height=3D21></TD>
    <TH vAlign=3Dcenter width=3D"95%" align=3Dleft><FONT =
size=3D+2>&nbsp;&nbsp; O<FONT=20
      size=3D-2>THER</FONT> G<FONT size=3D-2>ENETIC</FONT> A<FONT=20
      size=3D-2>BERRATIONS</FONT> </FONT></TH></TR></TBODY></TABLE>
<TABLE border=3D1 cellPadding=3D5 align=3Dright>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
top"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Top<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC1"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Learning Objectives<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
ABS"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Abstract<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC2"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Introduction<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC3"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Histology<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC4"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Reliability of the Histological...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC5"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Genetics: 1p/19q Codeletion and...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC6"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Histomorphology and 1p/19q...<BR></A><IMG border=3D0 =
hspace=3D5=20
      alt=3D" " =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/dot.gif"=20
      width=3D11 height=3D9><FONT color=3D#464c53>Other Genetic=20
      Aberrations</FONT><BR><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC8"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Methyl Guanine Methyltransferase...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC9"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Why Are 1p/19q Codeleted...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC10"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Is 1p/19q Codeletion Predictive...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC11"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Treatment of Low-Grade Tumors<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC12"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Treatment of Anaplastic Tumors<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC13"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Conclusions<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC14"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Author Contributions<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
BIBL"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      =
height=3D9>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>C=
ompared=20
with low-grade ODs, AODs usually have additional chromosomal<SUP>=20
</SUP>deletions, in particular loss of heterozygosity for 9p and/or<SUP> =

</SUP>deletion of the <I>CDKN2A</I> gene (p16) [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B15">15</A>].=20
These occur in 33%=9650%<SUP> </SUP>of AODs and are associated with =
tumor=20
progression. As a rule,<SUP> </SUP>other chromosomal abnormalities are =
found in=20
low-grade and in<SUP> </SUP>high-grade ODs with atypical morphological =
features.=20
These are<SUP> </SUP>typically associated with astrocytomas and are =
usually=20
mutually<SUP> </SUP>exclusive with 1p/19q codeletion (e.g., <I>TP53</I>=20
mutations in low-grade<SUP> </SUP>tumors and <I>EGFR</I> amplification, =
10q=20
loss, and <I>PTEN</I> mutations<SUP> </SUP>in anaplastic tumors) [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B15">15</A>,=20
<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B28">28</A>=96<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B31">31</A>].=20
Deletions on chromosome<SUP> </SUP>10 have been reported in 19%=9625% of =

anaplastic oligodendroglial<SUP> </SUP>tumors (AOTs) [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B15">15</A>,=20
<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B32">32</A>].=20
Amplification of the <I>EGFR</I> gene on chromosome<SUP> </SUP>7p occurs =
in=20
20%=9630% of AOTs, but reportedly never in<SUP> </SUP>those with =
deletion of 1p=20
and 19q, and correlates with a poor<SUP> </SUP>prognosis [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B14">14</A>,=20
<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B15">15</A>,=20
<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B33">33</A>,=20
<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B34">34</A>].=20
Similarly, molecular analysis of<SUP> </SUP>the prospective EORTC study =
on AOTs=20
observed more frequent loss<SUP> </SUP>of chromosome 10 and =
amplification of the=20
<I>EGFR</I> gene in tumors<SUP> </SUP>diagnosed as mixed OAs with =
necrosis [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B18">18</A>].=20
Again, these aberrations<SUP> </SUP>were inversely correlated with the =
1p/19q=20
codeletion. This suggests<SUP> </SUP>that these tumors are derived from=20
different precursor cells.<SUP> </SUP>This hypothesis is supported by =
the marked=20
differences in outcome<SUP> </SUP>and prognosis, with a superior outcome =
in the=20
presence of 1p<SUP> </SUP>and 19q loss, and with poor survival in AODs =
with the=20
loss of<SUP> </SUP>10q and/or the amplification of <I>EGFR</I> [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B30">30</A>].=20
The presence of 10q<SUP> </SUP>loss or <I>EGFR</I> amplification in pure =
AODs is=20
sufficiently rare<SUP> </SUP>to suggest an alternate diagnosis (e.g., =
small cell=20
glioblastoma)<SUP> </SUP>[<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B15">15</A>].=20
AOAs do not appear to constitute a fixed class of tumors,<SUP> </SUP>but =
rather=20
a morphological continuum between pure ODs and astrocytomas.<SUP> =
</SUP>Only in=20
exceptional cases do mixed tumors show genetically distinct<SUP> =
</SUP>clones of=20
tumor within histologically different areas [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B35">35</A>].<SUP>=20
</SUP>
<P>In an intriguing study on 70 patients with grade II and III<SUP>=20
</SUP>oligodendroglial tumors, a number of prognostically =
unfavorable<SUP>=20
</SUP>genomic alterations were identified, in particular, gain of<SUP> =
</SUP>7p=20
and 8q and loss of 9p, 10q, and 18q [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B36">36</A>].=20
In the anaplastic<SUP> </SUP>tumors, the presence of the 1p/19q =
codeletion was a=20
favorable<SUP> </SUP>prognostic factor, particularly if no other =
unfavorable=20
genomic<SUP> </SUP>aberrations had been identified. Similarly, outcome =
was=20
equally<SUP> </SUP>favorable in patients without 1p/19q codeletion and =
also=20
without<SUP> </SUP>other unfavorable genomic aberrations. However, if 1p =
and=20
19q<SUP> </SUP>loss was accompanied by unfavorable alterations, the=20
prognosis<SUP> </SUP>was poor. Others have reported that the prognostic =
impact=20
of<SUP> </SUP>1p and 19q loss is mainly present in tumors with classic =
AOD<SUP>=20
</SUP>morphology, but not in oligodendroglial tumors with atypical<SUP>=20
</SUP>features or in mixed AOAs [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B6">6</A>,=20
<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B27">27</A>].<SUP>=20
</SUP>
<P><A name=3DSEC8><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD bgColor=3D#ffffff vAlign=3Dcenter width=3D"5%" align=3Dleft><IMG =
hspace=3D5=20
      alt=3D" " =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/rarrow.gif"=20
      width=3D10 height=3D21></TD>
    <TH vAlign=3Dcenter width=3D"95%" align=3Dleft><FONT =
size=3D+2>&nbsp;&nbsp; M<FONT=20
      size=3D-2>ETHYL</FONT> G<FONT size=3D-2>UANINE</FONT> M<FONT=20
      size=3D-2>ETHYLTRANSFERASE</FONT> G<FONT size=3D-2>ENE</FONT> =
(<I>MGMT</I>)=20
      <FONT size=3D-2>AND</FONT> A<FONT size=3D-2>LKYLTRANSFERASE</FONT> =

  </FONT></TH></TR></TBODY></TABLE>
<TABLE border=3D1 cellPadding=3D5 align=3Dright>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
top"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Top<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC1"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Learning Objectives<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
ABS"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Abstract<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC2"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Introduction<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC3"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Histology<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC4"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Reliability of the Histological...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC5"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Genetics: 1p/19q Codeletion and...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC6"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Histomorphology and 1p/19q...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC7"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Other Genetic Aberrations<BR></A><IMG border=3D0 =
hspace=3D5 alt=3D" "=20
      src=3D"http://theoncologist.alphamedpress.org/icons/toc/dot.gif" =
width=3D11=20
      height=3D9><FONT color=3D#464c53>Methyl Guanine=20
      Methyltransferase...</FONT><BR><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC9"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Why Are 1p/19q Codeleted...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC10"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Is 1p/19q Codeletion Predictive...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC11"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Treatment of Low-Grade Tumors<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC12"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Treatment of Anaplastic Tumors<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC13"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Conclusions<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC14"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Author Contributions<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
BIBL"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      =
height=3D9>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>N=
o clear=20
explanation is yet available for the favorable response<SUP> </SUP>to=20
chemotherapy of AOTs as compared with astrocytic tumors.<SUP> =
</SUP>Previous=20
studies suggested that the nuclear enzyme alkyltransferase,<SUP> =
</SUP>also=20
known as methyl guanine methyltransferase (MGMT), which<SUP> =
</SUP>mediates at=20
least part of the cell resistance to alkylating<SUP> </SUP>and =
methylating=20
agents, is less expressed in ODs and perhaps<SUP> </SUP>even more so in =
1p/19q=20
codeleted tumors [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B37">37</A>].=20
MGMT expression<SUP> </SUP>can be silenced by <I>MGMT</I> promoter gene=20
methylation, which was<SUP> </SUP>initially reported to occur in 47% of=20
low-grade ODs without<SUP> </SUP>a correlation with 1p/19q codeletion =
[<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B38">38</A>].=20
Other studies did,<SUP> </SUP>however, find a correlation between 1p/19q =

codeletion and <I>MGMT</I><SUP> </SUP>promoter methylation, which was =
observed=20
in up to 80%=9690%<SUP> </SUP>of 1p/19q codeleted tumors [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B39">39</A>=96<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B41">41</A>].=20
<I>MGMT</I> promoter gene<SUP> </SUP>methylation occurs in up to =
40%=9650% of=20
glioblastomas;<SUP> </SUP>it is therefore unlikely that this event alone =

accounts for<SUP> </SUP>the entire difference in sensitivity to =
chemotherapy=20
between<SUP> </SUP>astrocytic tumors and oligodendroglial tumors, or for =
the=20
greater<SUP> </SUP>chemosensitivity in 1p/19q codeleted tumors.<SUP> =
</SUP>
<P><A name=3DSEC9><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD bgColor=3D#ffffff vAlign=3Dcenter width=3D"5%" align=3Dleft><IMG =
hspace=3D5=20
      alt=3D" " =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/rarrow.gif"=20
      width=3D10 height=3D21></TD>
    <TH vAlign=3Dcenter width=3D"95%" align=3Dleft><FONT =
size=3D+2>&nbsp;&nbsp; W<FONT=20
      size=3D-2>HY</FONT> A<FONT size=3D-2>RE</FONT> 1<FONT =
size=3D-2>P</FONT>/19<FONT=20
      size=3D-2>Q</FONT> C<FONT size=3D-2>ODELETED</FONT> T<FONT=20
      size=3D-2>UMORS</FONT> M<FONT size=3D-2>ORE</FONT> S<FONT=20
      size=3D-2>ENSITIVE</FONT><FONT size=3D-1> </FONT><FONT =
size=3D-2>TO</FONT>=20
      T<FONT size=3D-2>REATMENT</FONT>? =
</FONT></TH></TR></TBODY></TABLE>
<TABLE border=3D1 cellPadding=3D5 align=3Dright>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
top"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Top<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC1"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Learning Objectives<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
ABS"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Abstract<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC2"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Introduction<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC3"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Histology<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC4"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Reliability of the Histological...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC5"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Genetics: 1p/19q Codeletion and...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC6"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Histomorphology and 1p/19q...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC7"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Other Genetic Aberrations<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC8"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Methyl Guanine Methyltransferase...<BR></A><IMG =
border=3D0 hspace=3D5=20
      alt=3D" " =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/dot.gif"=20
      width=3D11 height=3D9><FONT color=3D#464c53>Why Are 1p/19q=20
      Codeleted...</FONT><BR><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC10"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Is 1p/19q Codeletion Predictive...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC11"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Treatment of Low-Grade Tumors<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC12"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Treatment of Anaplastic Tumors<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC13"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Conclusions<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC14"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Author Contributions<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
BIBL"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      =
height=3D9>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>W=
hy 1p/19q=20
codeleted tumors are more sensitive to RT and chemotherapy<SUP> =
</SUP>remains an=20
unanswered question. There are a number of possible<SUP> =
</SUP>explanations:=20
loss of genes that mediate resistance to treatment,<SUP> </SUP>the =
assumption=20
that 1p and 19q loss is an epiphenomenon that<SUP> </SUP>identifies a =
tumor that=20
is more sensitive to treatment (e.g.,<SUP> </SUP>with less frequent =
other=20
unfavorable mutations/alterations),<SUP> </SUP>or an association between =
1p and=20
19q loss and other genetic<SUP> </SUP>events (e.g., <I>MGMT</I> promoter =
gene=20
methylation). It is clear that<SUP> </SUP>ODs with 1p and 19q loss have =
gene=20
expression profiles that<SUP> </SUP>differ from those of other gliomas =
[<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B42">42</A>].=20
The gene expression<SUP> </SUP>profile of 1p/19q codeleted ODs partially =

resembles that of<SUP> </SUP>the normal brain (proneural expression =
pattern) [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B43">43</A>].<SUP>=20
</SUP>
<P>Several studies have shown that other specific epigenetic =
aberrations<SUP>=20
</SUP>are observed in 1p/19q codeleted tumors. The maternally =
imprinted<SUP>=20
</SUP><I>DIRAS3</I> tumor suppressor gene is located on 1p31, the=20
expression<SUP> </SUP>of which is significantly decreased because of =
methylation=20
in<SUP> </SUP>ODs with 1p loss [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B44">44</A>].=20
Biallelic <I>DIRAS3</I> inactivation has been<SUP> </SUP>associated with =

survival. Similarly, the expression of the <I>CITED4</I><SUP> </SUP>gene =
on=20
1p34.2 seems decreased through hypermethylation [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B45">45</A>].<SUP>=20
</SUP>Again, <I>CITED4</I> hypermethylation has been associated with =
longer<SUP>=20
</SUP>survival. <I>EMP3</I>, located at 19q13.3, is another example of =
a<SUP>=20
</SUP>gene that is frequently hypermethylated in OD and =
astrocytoma,<SUP>=20
</SUP>but not in primary glioblastoma [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B46">46</A>].=20
In all these cases, one<SUP> </SUP>allele is silenced because of loss =
and the=20
other through hypermethylation.<SUP> </SUP>These findings support a =
major role=20
for epigenetic phenomena<SUP> </SUP>in the pathogenesis of OD.<SUP> =
</SUP>
<P><A name=3DSEC10><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD bgColor=3D#ffffff vAlign=3Dcenter width=3D"5%" align=3Dleft><IMG =
hspace=3D5=20
      alt=3D" " =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/rarrow.gif"=20
      width=3D10 height=3D21></TD>
    <TH vAlign=3Dcenter width=3D"95%" align=3Dleft><FONT =
size=3D+2>&nbsp;&nbsp; I<FONT=20
      size=3D-2>S</FONT> 1<FONT size=3D-2>P</FONT>/19<FONT =
size=3D-2>Q</FONT> C<FONT=20
      size=3D-2>ODELETION</FONT> P<FONT size=3D-2>REDICTIVE</FONT><FONT =
size=3D-1>=20
      </FONT><FONT size=3D-2>OF</FONT> O<FONT =
size=3D-2>UTCOME</FONT><FONT size=3D-1>=20
      </FONT><FONT size=3D-2>TO</FONT> C<FONT =
size=3D-2>HEMOTHERAPY</FONT><FONT=20
      size=3D-1>, </FONT><FONT size=3D-2>OR</FONT> P<FONT =
size=3D-2>ROGNOSTIC</FONT>?=20
      </FONT></TH></TR></TBODY></TABLE>
<TABLE border=3D1 cellPadding=3D5 align=3Dright>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
top"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Top<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC1"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Learning Objectives<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
ABS"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Abstract<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC2"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Introduction<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC3"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Histology<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC4"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Reliability of the Histological...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC5"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Genetics: 1p/19q Codeletion and...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC6"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Histomorphology and 1p/19q...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC7"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Other Genetic Aberrations<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC8"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Methyl Guanine Methyltransferase...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC9"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Why Are 1p/19q Codeleted...<BR></A><IMG border=3D0 =
hspace=3D5 alt=3D" "=20
      src=3D"http://theoncologist.alphamedpress.org/icons/toc/dot.gif" =
width=3D11=20
      height=3D9><FONT color=3D#464c53>Is 1p/19q Codeletion=20
      Predictive...</FONT><BR><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC11"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Treatment of Low-Grade Tumors<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC12"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Treatment of Anaplastic Tumors<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC13"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Conclusions<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC14"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Author Contributions<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
BIBL"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      =
height=3D9>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>I=
nitial=20
studies observed that response and survival rates were<SUP> </SUP>better =
in=20
patients with OD with combined 1p and 19q loss than<SUP> </SUP>in those =
without=20
1p and 19q loss. Several studies have found<SUP> </SUP>the presence or =
absence=20
of combined loss of 1p and 19q to be<SUP> </SUP>the most important =
prognostic=20
factor for overall survival in<SUP> </SUP>AOTs [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B5">5</A>,=20
<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B47">47</A>,=20
<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B48">48</A>].=20
The median survival duration was &gt;6=967<SUP> </SUP>years in the =
presence of the=20
1p/19q codeletion, and 2=963<SUP> </SUP>years in the absence of the =
codeletion.=20
For low-grade OD or<SUP> </SUP>OA, median survival time were 12=9615 =
years for=20
1p/19q codeleted<SUP> </SUP>patients and 5=968 years for patients =
without the=20
deletion<SUP> </SUP>[<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B15">15</A>,=20
<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B21">21</A>].=20
In all these studies, patients were treated with either<SUP> =
</SUP>chemotherapy=20
or RT, and the longer progression-free survival<SUP> </SUP>time in =
RT-only=20
treated patients suggests that the 1p/19q codeletion<SUP> </SUP>is more =
a=20
prognostic than a predictive factor [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B26">26</A>,=20
<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B48">48</A>].=20
This<SUP> </SUP>view was corroborated by studies that suggested that ODs =

have<SUP> </SUP>a more indolent behavior, even prior to the initiation =
of=20
treatment<SUP> </SUP>[<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B8">8</A>,=20
<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B10">10</A>].=20
Indeed, a study measuring growth speed in low-grade<SUP> </SUP>gliomas =
observed=20
a slower growth rate in 1p/19q codeleted ODs<SUP> </SUP>[<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B49">49</A>].=20
However, in a recent study of untreated low-grade ODs<SUP> </SUP>and =
AOTs, on=20
multivariate analysis, the presence of 1p and 19q<SUP> </SUP>loss was =
found not=20
to be prognostic for progression-free survival<SUP> </SUP>[<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B20">20</A>].=20
The overall picture that emerges from this is that 1p/19q<SUP> =
</SUP>codeleted=20
tumors tend to have slower growth rates and to be<SUP> </SUP>more =
responsive to=20
treatment than tumors without this codeletion.<SUP> </SUP>In that sense, =
the=20
1p/19q codeletion identifies a favorable<SUP> </SUP>prognostic subgroup, =

although it also predicts outcome to treatment.<SUP> </SUP>However, it =
may not=20
really help in deciding on chemotherapy<SUP> </SUP>or not, because RT is =
also=20
likely to give good treatment results.<SUP> </SUP>
<P><A name=3DSEC11><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD bgColor=3D#ffffff vAlign=3Dcenter width=3D"5%" align=3Dleft><IMG =
hspace=3D5=20
      alt=3D" " =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/rarrow.gif"=20
      width=3D10 height=3D21></TD>
    <TH vAlign=3Dcenter width=3D"95%" align=3Dleft><FONT =
size=3D+2>&nbsp;&nbsp; T<FONT=20
      size=3D-2>REATMENT</FONT><FONT size=3D-1> </FONT><FONT =
size=3D-2>OF</FONT>=20
      L<FONT size=3D-2>OW</FONT>-G<FONT size=3D-2>RADE</FONT> T<FONT=20
      size=3D-2>UMORS</FONT> </FONT></TH></TR></TBODY></TABLE>
<TABLE border=3D1 cellPadding=3D5 align=3Dright>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
top"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Top<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC1"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Learning Objectives<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
ABS"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Abstract<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC2"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Introduction<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC3"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Histology<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC4"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Reliability of the Histological...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC5"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Genetics: 1p/19q Codeletion and...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC6"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Histomorphology and 1p/19q...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC7"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Other Genetic Aberrations<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC8"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Methyl Guanine Methyltransferase...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC9"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Why Are 1p/19q Codeleted...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC10"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Is 1p/19q Codeletion Predictive...<BR></A><IMG =
border=3D0 hspace=3D5=20
      alt=3D" " =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/dot.gif"=20
      width=3D11 height=3D9><FONT color=3D#464c53>Treatment of Low-Grade =

      Tumors</FONT><BR><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC12"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Treatment of Anaplastic Tumors<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC13"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Conclusions<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC14"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Author Contributions<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
BIBL"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      =
height=3D9>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>F=
ollowing=20
the favorable response of AOTs to chemotherapy, chemotherapy<SUP> =
</SUP>as=20
initial treatment, employing either PCV or temozolomide,<SUP> </SUP>for =
patients=20
with progressive low-grade ODs has been investigated<SUP> </SUP>in a =
limited=20
number of retrospective or phase II studies. Radiological<SUP> =
</SUP>response=20
rates, including the category minor response, of 30%=9670%<SUP> =
</SUP>have been=20
reported with PCV or with temozolomide, with a median<SUP> </SUP>time to =

progression of 2=963 years [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B49">49</A>=96<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B52">52</A>].=20
Response<SUP> </SUP>may be delayed=97one series described a median time =
to=20
maximum<SUP> </SUP>response of 12 months=97and clinical response (e.g.,=20
better<SUP> </SUP>seizure control) is frequently more impressive than=20
radiological<SUP> </SUP>response. Response rates are higher and time to=20
progression<SUP> </SUP>is longer in 1p/19q codeleted tumors. Whether =
first-line=20
chemotherapy<SUP> </SUP>for low-grade OD is superior to RT is unknown; =
the=20
results of<SUP> </SUP>a current EORTC phase III study on this subject =
are=20
awaited.<SUP> </SUP>In the meantime, for patients requiring large RT =
portals=20
for<SUP> </SUP>large tumors, upfront treatment with PCV or temozolomide =
to<SUP>=20
</SUP>avoid or delay the risk for late cognitive defects is a =
reasonable<SUP>=20
</SUP>treatment option.<SUP> </SUP>
<P><A name=3DSEC12><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD bgColor=3D#ffffff vAlign=3Dcenter width=3D"5%" align=3Dleft><IMG =
hspace=3D5=20
      alt=3D" " =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/rarrow.gif"=20
      width=3D10 height=3D21></TD>
    <TH vAlign=3Dcenter width=3D"95%" align=3Dleft><FONT =
size=3D+2>&nbsp;&nbsp; T<FONT=20
      size=3D-2>REATMENT</FONT><FONT size=3D-1> </FONT><FONT =
size=3D-2>OF</FONT>=20
      A<FONT size=3D-2>NAPLASTIC</FONT> T<FONT size=3D-2>UMORS</FONT>=20
  </FONT></TH></TR></TBODY></TABLE>
<TABLE border=3D1 cellPadding=3D5 align=3Dright>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
top"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Top<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC1"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Learning Objectives<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
ABS"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Abstract<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC2"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Introduction<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC3"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Histology<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC4"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Reliability of the Histological...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC5"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Genetics: 1p/19q Codeletion and...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC6"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Histomorphology and 1p/19q...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC7"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Other Genetic Aberrations<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC8"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Methyl Guanine Methyltransferase...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC9"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Why Are 1p/19q Codeleted...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC10"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Is 1p/19q Codeletion Predictive...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC11"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Treatment of Low-Grade Tumors<BR></A><IMG border=3D0 =
hspace=3D5=20
      alt=3D" " =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/dot.gif"=20
      width=3D11 height=3D9><FONT color=3D#464c53>Treatment of =
Anaplastic=20
      Tumors</FONT><BR><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC13"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Conclusions<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC14"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Author Contributions<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
BIBL"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      =
height=3D9>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR><=
STRONG>Newly=20
Diagnosed AOD and AOA: (Neo-)adjuvant Chemotherapy =
Trials</STRONG><BR>Two=20
prospective, randomized, controlled trials in AOTs have<SUP> </SUP>shown =
that=20
(neo)adjuvant PCV chemotherapy given in addition<SUP> </SUP>to 60 Gy of =
RT does=20
not result in a longer overall survival<SUP> </SUP>time, although it =
does lead=20
to a longer progression-free survival<SUP> </SUP>time. The first of =
these=20
trials, RTOG 94=9602, randomized<SUP> </SUP>patients to either four =
cycles of=20
upfront intensified PCV chemotherapy<SUP> </SUP>followed by RT to a dose =
of 60=20
Gy or RT only [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B47">47</A>].=20
The second<SUP> </SUP>trial (EORTC 26951) randomized patients to 60 Gy =
of RT=20
followed<SUP> </SUP>by six cycles adjuvant PCV or to 60 Gy of RT only =
[<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B48">48</A>].=20
<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
T1">Table=20
1</A><SUP> </SUP>summarizes the progression-free survival and overall=20
survival<SUP> </SUP>results of these studies. In both trials, the =
majority of=20
patients<SUP> </SUP>randomized to the RT arm received PCV at =
progression,=20
which<SUP> </SUP>most likely explains the longer progression-free =
survival=20
time<SUP> </SUP>without a longer overall survival time. Because of this, =

these<SUP> </SUP>trials in fact investigated early (adjuvant) versus=20
delayed<SUP> </SUP>(at the time of progression) PCV chemotherapy. Even =
in the=20
1p/19q<SUP> </SUP>loss subgroup analysis, no overall survival benefit of =

early<SUP> </SUP>(i.e., adjuvant or neoadjuvant) PCV could be =
demonstrated (<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
T1">Table=20
1</A>).<SUP> </SUP>The conclusion of both trials is that in AOD, early =
PCV=20
given<SUP> </SUP>sequentially with RT does not provide a superior =
outcome=20
to<SUP> </SUP>initial RT only followed by chemotherapy at the time of=20
recurrence.<SUP> </SUP>
<P><SUP></SUP>
<P><A name=3DT1><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD bgColor=3D#ffffff vAlign=3Dtop align=3Dmiddle><STRONG>View =
this=20
            table:</STRONG><BR><NOBR><A=20
            =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155/=
T1">[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('T1', 950, 537); =
this.href=3D'/cgi/content-nw/full/14/2/155/T1'"=20
            =
href=3D"http://theoncologist.alphamedpress.org/cgi/content-nw/full/14/2/1=
55/T1"=20
            target=3DT1>[in a new window]</A><BR><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><B>Table 1.</B> Median survival =
time and=20
            5-year overall survival rate according to combined 1p and =
19q loss=20
            status in the EORTC 26951 and RTOG 9402 trials on =
(neo-)adjuvant PCV=20
            chemotherapy in anaplastic oligodendroglial tumors [<A=20
            =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B47">47</A>,=20
            <A=20
            =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B48">48</A>]
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR>In=20
a rather complex recent German study, patients with grade<SUP> </SUP>III =
tumors=20
(anaplastic astrocytoma, AOA, AOD) were randomized<SUP> </SUP>to either =
RT or=20
chemotherapy; within the chemotherapy arm, patients<SUP> </SUP>were =
further=20
randomized between PCV and temozolomide [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B53">53</A>].=20
The<SUP> </SUP>trial design included crossover to the other treatment=20
(chemotherapy<SUP> </SUP>or RT) at the time of progression. Neither the =
initial=20
randomization<SUP> </SUP>(RT or chemotherapy) nor the type of =
chemotherapy=20
regimen impacted<SUP> </SUP>survival. In the first analysis of the =
study, MGMT=20
methylation<SUP> </SUP>status appeared to be a more important prognostic =
factor=20
than<SUP> </SUP>1p/19q status.<SUP> </SUP>
<P><STRONG>Chemoirradiation with Temozolomide?</STRONG><BR>The current =
clinical=20
question is whether combined chemoirradiation<SUP> </SUP>with =
temozolomide=20
should also be used for AOTs. The negative<SUP> </SUP>outcome of the =
adjuvant=20
PCV trials is in contrast to the observed<SUP> </SUP>survival benefit in =

glioblastoma patients of combined chemoirradiation<SUP> </SUP>with =
temozolomide,=20
especially in tumors with a methylated <I>MGMT</I><SUP> </SUP>promoter =
gene [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B54">54</A>,=20
<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B55">55</A>].=20
A particular consideration here is that<SUP> </SUP>patients with =
anaplastic=20
tumors with combined 1p and 19q loss<SUP> </SUP>have a median survival =
duration=20
&gt;6=967 years. Hence,<SUP> </SUP>the late neurotoxicity of a combined=20
radiochemotherapy approach<SUP> </SUP>is potentially an issue. This is =
clearly=20
less so for tumors<SUP> </SUP>without 1p and 19q loss, but here the =
benefit of=20
the combined<SUP> </SUP>regimen is also unproven. Current studies are=20
investigating<SUP> </SUP>the role of combined chemoirradiation in AODs,=20
including other<SUP> </SUP>grade III tumors, with separate trials for =
tumors=20
with and without<SUP> </SUP>combined 1p and 19q loss.<SUP> </SUP>
<P><STRONG>Upfront Chemotherapy in Newly Diagnosed AOT</STRONG><BR>The=20
chemosensitivity of OTs has made upfront chemotherapy strategies<SUP>=20
</SUP>(with or without subsequent RT) increasingly popular. The =
major<SUP>=20
</SUP>rationale for upfront chemotherapy is the wish to defer RT.<SUP> =
</SUP>A=20
few medium-sized and uncontrolled studies are available, in<SUP>=20
</SUP>particular, employing temozolomide. One showed, in a young =
population<SUP>=20
</SUP>(median age, 42 years) with 81% of patients having a =
Karnofsky<SUP>=20
</SUP>Performance Status score of 90/100, a median progression-free<SUP> =

</SUP>survival time of 27 months with a 1-week-on/1-week-off =
dose-dense<SUP>=20
</SUP>temozolomide regimen [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B56">56</A>].=20
A small trial on upfront temozolomide<SUP> </SUP>chemotherapy showed a =
very=20
short time to progression (8 months)<SUP> </SUP>in patients without 1p =
loss, in=20
contrast to all seven patients<SUP> </SUP>with 1p loss who were still =
free from=20
progression at 24 months<SUP> </SUP>[<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B57">57</A>].=20
In a prospective phase II study carried out by the RTOG,<SUP> </SUP>39 =
eligible=20
patients were neoadjuvantly treated with 6 months<SUP> </SUP>of=20
1-week-on/1-week-off 150 mg/m<SUP>2</SUP> temozolomide, followed by<SUP> =

</SUP>concurrent chemoirradiation with temozolomide [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B58">58</A>].=20
In 32% of<SUP> </SUP>patients, an objective response was observed; 10% =
of=20
patients<SUP> </SUP>progressed during neoadjuvant temozolomide. In 28=20
patients,<SUP> </SUP>the 1p/19q status could be assessed; all 17 =
patients with=20
the<SUP> </SUP>1p/19q codeletion were free from progression at 6 months. =
No<SUP>=20
</SUP>less than 16 of the 20 patients tested had <I>MGMT</I> promoter=20
methylation,<SUP> </SUP>all were free from progression at 6 months. =
Thirteen of=20
the<SUP> </SUP>16 patients with <I>MGMT</I> promoter methylation also =
had 1p/19q=20
codeletion.<SUP> </SUP>The overall survival rate at 30 months was 81%; =
the=20
1p/19q codeletion<SUP> </SUP>was related to survival. The obvious =
difficulty in=20
the interpretation<SUP> </SUP>of this trial is the short follow-up and =
absence=20
of control<SUP> </SUP>patients, limiting conclusions beyond the =
well-established=20
superior<SUP> </SUP>outcome for patients with 1p/19q codeleted AOTs with =

upfront<SUP> </SUP>temozolomide.<SUP> </SUP>
<P>In a phase II trial in 69 patients with newly diagnosed =
anaplastic<SUP>=20
</SUP>or aggressive OD, the intensive PCV regimen was followed by<SUP>=20
</SUP>high-dose thiotepa with autologous stem cell rescue, without<SUP>=20
</SUP>RT. The median progression-free survival time in the 39 =
patients<SUP>=20
</SUP>who received the autologous stem cell procedure was 78 =
months,<SUP>=20
</SUP>and the median overall survival time had not been reached. =
Eighteen<SUP>=20
</SUP>patients (46%) had relapsed [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B59">59</A>].=20
In view of the patient selection<SUP> </SUP>and the absence of a control =
arm,=20
final conclusions on the meaning<SUP> </SUP>of these results are =
impossible to=20
draw; many patients with<SUP> </SUP>AOTs have similar survival times =
without=20
such intensive treatments.<SUP> </SUP>The trial showed, though, that a =
longer=20
progression-free survival<SUP> </SUP>time without initial RT is =
possible. The=20
German NOA4 trial showed<SUP> </SUP>that patients treated with =
chemotherapy=20
first had a similar<SUP> </SUP>survival benefit to patients managed with =
RT=20
first [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B53">53</A>].=20
That<SUP> </SUP>trial, which basically studied sequential treatment (RT=20
first<SUP> </SUP>or chemotherapy first), demonstrated that whatever=20
sequence<SUP> </SUP>is followed, the results are comparable. The choice =
for=20
chemotherapy<SUP> </SUP>or RT may well come down to deciding between =
side=20
effects: local<SUP> </SUP>side effects of a short series of RT or =
systemic side=20
effects<SUP> </SUP>of (expensive) chemotherapy of 1-year duration.<SUP> =
</SUP>
<P><STRONG>Second-Line Chemotherapy in Recurrent =
AOTs</STRONG><BR>Second-line=20
PCV after failure with temozolomide induced a response<SUP> </SUP>in =
only 17% of=20
patients, but 50% were still free from progression<SUP> </SUP>at 6 =
months and=20
21% were still free from progression at 12 months<SUP> </SUP>[<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B60">60</A>].=20
Similarly, 25% of patients had an objective response to<SUP> =
</SUP>temozolomide=20
after PCV and 29% and 11% of patients were free<SUP> </SUP>from =
progression=20
after 6 and 12 months, respectively [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B61">61</A>].=20
Occasionally,<SUP> </SUP>patients that do not respond to one regimen are =

responsive to<SUP> </SUP>the other. However, in general, response rates =
to=20
second-line<SUP> </SUP>chemotherapy are modest, even in 1p/19q codeleted =
tumors=20
(and<SUP> </SUP>regardless of the sequence chosen=97temozolomide first =
or<SUP>=20
</SUP>PCV first). Still, very few other agents have been =
systematically<SUP>=20
</SUP>evaluated in AOTs. One trial found PCV chemotherapy followed<SUP> =
</SUP>by=20
an autologous bone marrow transplantation after a myeloablative<SUP>=20
</SUP>procedure with melphalan to be too toxic, without clearly =
producing<SUP>=20
</SUP>superior results [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B62">62</A>].=20
Response to carboplatin monotherapy was<SUP> </SUP>similar to that of=20
temozolomide, with 13% of patients responding<SUP> </SUP>and with 35% =
and 9% 6-=20
and 12-month progression-free survival<SUP> </SUP>times, respectively =
[<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B63">63</A>].=20
These results were obtained, however,<SUP> </SUP>at the cost of =
considerable=20
myelotoxicity. In a study of CPT-11<SUP> </SUP>on 22 patients with =
1p/19q=20
codeleted AODs, the response rate<SUP> </SUP>was 23% and the 6- and =
12-month=20
progression-free survival times<SUP> </SUP>were 33% and 4.5%, =
respectively [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B64">64</A>].=20
Despite the upregulation<SUP> </SUP>of platelet-derived growth factor =
(PDGF)=20
signaling pathways<SUP> </SUP>in most ODs, the PDGF receptor tyrosine =
kinase=20
inhibitor imatinib<SUP> </SUP>did not show any activity in recurrent OD =
or=20
AOD/AOA [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B65">65</A>].=20
Clearly,<SUP> </SUP>for a further improvement in outcome after failing=20
first-line<SUP> </SUP>chemotherapy and RT, other approaches need to be=20
developed.<SUP> </SUP>
<P><A name=3DSEC13><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD bgColor=3D#ffffff vAlign=3Dcenter width=3D"5%" align=3Dleft><IMG =
hspace=3D5=20
      alt=3D" " =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/rarrow.gif"=20
      width=3D10 height=3D21></TD>
    <TH vAlign=3Dcenter width=3D"95%" align=3Dleft><FONT =
size=3D+2>&nbsp;&nbsp; C<FONT=20
      size=3D-2>ONCLUSIONS</FONT> </FONT></TH></TR></TBODY></TABLE>
<TABLE border=3D1 cellPadding=3D5 align=3Dright>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
top"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
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width=3D11=20
      height=3D9>Top<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC1"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Learning Objectives<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
ABS"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
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      height=3D9>Abstract<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC2"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
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      height=3D9>Introduction<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC3"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Histology<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC4"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Reliability of the Histological...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC5"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Genetics: 1p/19q Codeletion and...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC6"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Histomorphology and 1p/19q...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC7"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Other Genetic Aberrations<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC8"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Methyl Guanine Methyltransferase...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC9"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Why Are 1p/19q Codeleted...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC10"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Is 1p/19q Codeletion Predictive...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC11"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Treatment of Low-Grade Tumors<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC12"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Treatment of Anaplastic Tumors<BR></A><IMG border=3D0 =
hspace=3D5=20
      alt=3D" " =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/dot.gif"=20
      width=3D11 height=3D9><FONT =
color=3D#464c53>Conclusions</FONT><BR><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC14"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      height=3D9>Author Contributions<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
BIBL"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      =
height=3D9>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>T=
he=20
histological diagnosis of OD is still hampered by significant<SUP>=20
</SUP>interobserver variation. The clear correlation between =
classic<SUP>=20
</SUP>histology and 1p/19q codeletion has led some to use this =
codeletion<SUP>=20
</SUP>as a marker for OD, and it has even been suggested to build<SUP>=20
</SUP>this into the diagnosis. However, it is becoming increasingly<SUP> =

</SUP>questionable whether this nice and simple conclusion is =
justified.<SUP>=20
</SUP>Several studies have now observed that patients with tumors<SUP>=20
</SUP>with classic oligodendroglial morphology, even without 1p/19q<SUP> =

</SUP>codeletions, have a better prognosis than those with =
astrocytic<SUP>=20
</SUP>tumors [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B17">17</A>,=20
<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B36">36</A>,=20
<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B53">53</A>].=20
This argues in favor of the use of more<SUP> </SUP>strict morphological =
criteria=20
for oligodendroglial tumors, although<SUP> </SUP>even in the hands of =
experts up=20
to 20% of CFO cases may not<SUP> </SUP>be agreed upon [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B17">17</A>].=20
The recently modified WHO classification<SUP> </SUP>considers necrosis =
to no=20
longer be compatible with the diagnosis<SUP> </SUP>of mixed AOA, which =
should=20
thus be considered glioblastoma (with<SUP> </SUP>some oligodendroglial=20
features).<SUP> </SUP>
<P>The basic molecular characteristic of 1p/19q codeletion and<SUP> =
</SUP>the=20
explanation for the sensitivity of these tumors to RT and<SUP>=20
</SUP>chemotherapy is still unresolved. It is also unclear whether<SUP>=20
</SUP>that sensitivity is to be expected in tumors with classic =
morphology<SUP>=20
</SUP>in the absence of the 1p/19q codeletion. Despite the recent<SUP>=20
</SUP>data suggesting a favorable subset of these tumors, the =
initial<SUP>=20
</SUP>studies suggested that 1p/19q status was better correlated =
with<SUP>=20
</SUP>response to chemotherapy than with morphology [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B7">7</A>,=20
<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B8">8</A>].<SUP>=20
</SUP>
<P>For today's patients, sequential treatment with RT and =
chemotherapy,<SUP>=20
</SUP>depending on the expected side effects and treatment =
efficacy,<SUP>=20
</SUP>seems to be the optimal approach, with currently no solid =
data<SUP>=20
</SUP>available to help in making the choice between initial RT and<SUP> =

</SUP>initial chemotherapy [<A=20
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
B53">53</A>].=20
The value of concurrent chemoirradiation<SUP> </SUP>with temozolomide in =
these=20
tumors has not been established,<SUP> </SUP>nor has it been established =
whether=20
or not this treatment will<SUP> </SUP>induce long-term side effects in =
patients=20
with an expected long<SUP> </SUP>survival time.<SUP> </SUP>
<P><A name=3DSEC14><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD bgColor=3D#ffffff vAlign=3Dcenter width=3D"5%" align=3Dleft><IMG =
hspace=3D5=20
      alt=3D" " =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/rarrow.gif"=20
      width=3D10 height=3D21></TD>
    <TH vAlign=3Dcenter width=3D"95%" align=3Dleft><FONT =
size=3D+2>&nbsp;&nbsp; A<FONT=20
      size=3D-2>UTHOR</FONT> C<FONT size=3D-2>ONTRIBUTIONS</FONT>=20
  </FONT></TH></TR></TBODY></TABLE>
<TABLE border=3D1 cellPadding=3D5 align=3Dright>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
top"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Top<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC1"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Learning Objectives<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
ABS"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Abstract<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC2"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Introduction<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC3"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Histology<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC4"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Reliability of the Histological...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC5"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Genetics: 1p/19q Codeletion and...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC6"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Histomorphology and 1p/19q...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC7"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Other Genetic Aberrations<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC8"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Methyl Guanine Methyltransferase...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC9"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Why Are 1p/19q Codeleted...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC10"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Is 1p/19q Codeletion Predictive...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC11"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Treatment of Low-Grade Tumors<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC12"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Treatment of Anaplastic Tumors<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC13"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Conclusions<BR></A><IMG border=3D0 hspace=3D5 alt=3D" " =

      src=3D"http://theoncologist.alphamedpress.org/icons/toc/dot.gif" =
width=3D11=20
      height=3D9><FONT color=3D#464c53>Author Contributions</FONT><BR><A =

      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
BIBL"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/darrow.gif" =
width=3D11=20
      =
height=3D9>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR><=
B>Conception/design:</B>=20
Martin J. van den Bent, Jacolien E.C. Bromberg<SUP> </SUP>
<P><B>Provision of study materials:</B> Martin J. van den Bent, =
Jacolien<SUP>=20
</SUP>E.C. Bromberg<SUP> </SUP>
<P><B>Collection/assembly of data:</B> Martin J. van den Bent, =
Jacolien<SUP>=20
</SUP>E.C. Bromberg<SUP> </SUP>
<P><B>Manuscript writing:</B> Martin J. van den Bent, Jacolien E.C.=20
Bromberg<SUP> </SUP>
<P><B>Final approval of manuscript:</B> Martin J. van den Bent, =
Jacolien<SUP>=20
</SUP>E.C. Bromberg<SUP> </SUP>
<P><A name=3DBIBL><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD bgColor=3D#ffffff vAlign=3Dcenter width=3D"5%" align=3Dleft><IMG =
hspace=3D5=20
      alt=3D" " =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/rarrow.gif"=20
      width=3D10 height=3D21></TD>
    <TH vAlign=3Dcenter width=3D"95%" align=3Dleft><FONT =
size=3D+2>&nbsp;&nbsp; R<FONT=20
      size=3D-2>EFERENCES</FONT> </FONT></TH></TR></TBODY></TABLE>
<TABLE border=3D1 cellPadding=3D5 align=3Dright>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
top"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Top<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC1"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Learning Objectives<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
ABS"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Abstract<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC2"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Introduction<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC3"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Histology<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC4"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Reliability of the Histological...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC5"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Genetics: 1p/19q Codeletion and...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC6"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Histomorphology and 1p/19q...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC7"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Other Genetic Aberrations<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC8"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Methyl Guanine Methyltransferase...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC9"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Why Are 1p/19q Codeleted...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC10"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Is 1p/19q Codeletion Predictive...<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC11"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Treatment of Low-Grade Tumors<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC12"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Treatment of Anaplastic Tumors<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC13"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Conclusions<BR></A><A=20
      =
href=3D"http://theoncologist.alphamedpress.org/cgi/content/full/14/2/155#=
SEC14"><IMG=20
      border=3D0 hspace=3D5 alt=3D" "=20
      =
src=3D"http://theoncologist.alphamedpress.org/icons/toc/uarrow.gif" =
width=3D11=20
      height=3D9>Author Contributions<BR></A><IMG border=3D0 hspace=3D5 =
alt=3D" "=20
      src=3D"http://theoncologist.alphamedpress.org/icons/toc/dot.gif" =
width=3D11=20
      height=3D9><FONT=20
color=3D#464c53>References</FONT><BR></FONT></TH></TR></TBODY></TABLE>&nb=
sp;<BR>
<OL compact><A name=3DB1><!-- null --></A>
  <LI value=3D1>Cairncross G, Macdonald D, Ludwin S et al. National =
Cancer=20
  Institute of Canada Clinical Trials Group. Chemotherapy for anaplastic =

  oligodendroglioma. J Clin Oncol 1994;12:2013=962021.<!-- HIGHWIRE =
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href=3D"http://theoncologist.alphamedpress.org/cgi/ijlink?linkType=3DABST=
&amp;journalCode=3Djco&amp;resid=3D12/10/2013"><NOBR>[Abstract/<FONT=20
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  <LI value=3D2>van den Bent MJ, Kros JM, Heimans JJ et al. Dutch =
Neuro-oncology=20
  Group. Response rate and prognostic factors of recurrent =
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Neurology=20
  1998;51:1140=961145.<!-- HIGHWIRE ID=3D"14:2:155:2" --><A=20
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&amp;journalCode=3Dneurology&amp;resid=3D51/4/1140"><NOBR>[Abstract/<FONT=
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  color=3D#cc0000>Free</FONT>&nbsp;Full&nbsp;Text]</NOBR></A><!-- =
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  <LI value=3D3>Reifenberger J, Reifenberger G, Liu L et al. Molecular =
genetic=20
  analysis of oligodendroglial tumors shows preferential allelic =
deletions on=20
  19q and 1p. Am J Pathol 1994;145:1175=961190.<!-- HIGHWIRE =
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href=3D"http://theoncologist.alphamedpress.org/cgi/ijlink?linkType=3DABST=
&amp;journalCode=3Damjpathol&amp;resid=3D145/5/1175">[Abstract]</A><!-- =
/HIGHWIRE --><A=20
  name=3DB4><!-- null --></A>
  <LI value=3D4>Smith JS, Alderete B, Minn Y et al. Localization of =
common=20
  deletion regions on 1p and 19q in human gliomas and their association =
with=20
  histological subtype. Oncogene 1999;18:4144=964152.<!-- HIGHWIRE =
ID=3D"14:2:155:4" --><A=20
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href=3D"http://theoncologist.alphamedpress.org/cgi/external_ref?access_nu=
m=3D10.1038%2Fsj.onc.1202759&amp;link_type=3DDOI">[CrossRef]</A><A=20
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href=3D"http://theoncologist.alphamedpress.org/cgi/external_ref?access_nu=
m=3D10435596&amp;link_type=3DMED">[Medline]</A><!-- /HIGHWIRE --><A=20
  name=3DB5><!-- null --></A>
  <LI value=3D5>Smith JS, Perry A, Borell TJ et al. Alterations of =
chromosome arms=20
  1p and 19q as predictors of survival in oligodendrogliomas, =
astrocytoma, and=20
  mixed oligoastrocytomas. J Clin Oncol 2000;18:636=96645.<!-- HIGHWIRE =
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clear=3Dall><FONT face=3D""></FONT><BR clear=3Dall><BR clear=3Dall><BR =
clear=3Dall>
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------=_NextPart_000_0000_01C99B66.30C8DF50
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Content-Transfer-Encoding: quoted-printable
Content-Location: http://partner.googleadservices.com/gampad/google_service.js

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------=_NextPart_000_0000_01C99B66.30C8DF50
Content-Type: application/octet-stream
Content-Transfer-Encoding: quoted-printable
Content-Location: http://theoncologist.alphamedpress.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=
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        if (hdrName !=3D null) {=0A=
          this._headers[this._headers.length] =3D {h:hdrName, =
v:hdrValue};=0A=
          switch (hdrName.toLowerCase()) {=0A=
            case 'content-encoding': gotContentEncoding =3D true; break;=0A=
            case 'content-length'  : gotContentLength   =3D true; break;=0A=
            case 'content-type'    : gotContentType     =3D true; break;=0A=
            case 'date'            : gotDate            =3D true; break;=0A=
            case 'expires'         : gotExpiration      =3D true; break;=0A=
            case 'last-modified'   : gotLastModified    =3D true; break;=0A=
          }=0A=
        }=0A=
      }=0A=
      // try to fill in any missing header information=0A=
      var val;=0A=
      val =3D conn.getContentEncoding();=0A=
      if (val !=3D null && !gotContentEncoding) =
this._headers[this._headers.length] =3D {h:'Content-encoding', v:val};=0A=
      val =3D conn.getContentLength();=0A=
      if (val !=3D -1 && !gotContentLength) =
this._headers[this._headers.length] =3D {h:'Content-length', v:val};=0A=
      val =3D conn.getContentType();=0A=
      if (val !=3D null && !gotContentType) =
this._headers[this._headers.length] =3D {h:'Content-type', v:val};=0A=
      val =3D conn.getDate();=0A=
      if (val !=3D 0 && !gotDate) this._headers[this._headers.length] =
=3D {h:'Date', v:(new Date(val)).toUTCString()};=0A=
      val =3D conn.getExpiration();=0A=
      if (val !=3D 0 && !gotExpiration) =
this._headers[this._headers.length] =3D {h:'Expires', v:(new =
Date(val)).toUTCString()};=0A=
      val =3D conn.getLastModified();=0A=
      if (val !=3D 0 && !gotLastModified) =
this._headers[this._headers.length] =3D {h:'Last-modified', v:(new =
Date(val)).toUTCString()};=0A=
      // read response data=0A=
      var reqdata =3D '';=0A=
      var stream =3D conn.getInputStream();=0A=
      if (stream) {=0A=
        var reader =3D new java.io.BufferedReader(new =
java.io.InputStreamReader(stream, this._getCharset()));=0A=
        var line;=0A=
        while ((line =3D reader.readLine()) !=3D null) {=0A=
          if (this.readyState =3D=3D 2) {=0A=
            this.readyState =3D 3;=0A=
            if (this.onreadystatechange) {=0A=
              this.onreadystatechange();=0A=
            }=0A=
          }=0A=
          reqdata +=3D line + '\n';=0A=
        }=0A=
        reader.close();=0A=
        this.status =3D 200;=0A=
        this.statusText =3D 'OK';=0A=
        this.responseText =3D reqdata;=0A=
        this.readyState =3D 4;=0A=
        if (this.onreadystatechange) {=0A=
          this.onreadystatechange();=0A=
        }=0A=
        if (this.onload) {=0A=
          this.onload();=0A=
        }=0A=
      } else {=0A=
        // error=0A=
        this.status =3D 404;=0A=
        this.statusText =3D 'Not Found';=0A=
        this.responseText =3D '';=0A=
        this.readyState =3D 4;=0A=
        if (this.onreadystatechange) {=0A=
          this.onreadystatechange();=0A=
        }=0A=
        if (this.onerror) {=0A=
          this.onerror();=0A=
        }=0A=
      }=0A=
    };=0A=
  };=0A=
}=0A=
// ActiveXObject emulation=0A=
if (!window.ActiveXObject && window.XMLHttpRequest) {=0A=
  window.ActiveXObject =3D function(type) {=0A=
    switch (type.toLowerCase()) {=0A=
      case 'microsoft.xmlhttp':=0A=
      case 'msxml2.xmlhttp':=0A=
      case 'msxml2.xmlhttp.3.0':=0A=
      case 'msxml2.xmlhttp.4.0':=0A=
      case 'msxml2.xmlhttp.5.0':=0A=
        return new XMLHttpRequest();=0A=
    }=0A=
    return null;=0A=
  };=0A=
}=0A=

------=_NextPart_000_0000_01C99B66.30C8DF50
Content-Type: application/octet-stream
Content-Transfer-Encoding: quoted-printable
Content-Location: http://theoncologist.alphamedpress.org/javascript/ajax/utility.js

/************************************************************************=
*****=0A=
 * javascript/ajax/utility.js=0A=
 *=0A=
 * Utility functions for working with XMLHttpRequest data.=0A=
 *=0A=
 * Copyright 2006 Board of Trustees of the Leland Stanford Junior =
University.=0A=
 =
*************************************************************************=
***/=0A=
=0A=
/*=0A=
 * Copy XML nodes into an HTMLElement. This effectively=0A=
 * clones XML markup which uses XHTML naming conventions=0A=
 * into an HTML DOM.=0A=
 */=0A=
function copy_xml_to_html(src, dst) {=0A=
  if (src.nodeType =3D=3D 1) { /* Node.ELEMENT_NODE */=0A=
    var e =3D document.createElement(src.nodeName);=0A=
    for (var i =3D 0; i < src.childNodes.length; i++) {=0A=
	  copy_xml_to_html(src.childNodes[i], e);=0A=
    }=0A=
    for (var i =3D 0; i < src.attributes.length; i++) {=0A=
      var n =3D src.attributes[i].name;=0A=
      var v =3D unescape_xml_string(src.attributes[i].value);      =0A=
      e.setAttribute(n, v);=0A=
      if (n =3D=3D "class") {=0A=
        e.className =3D v;=0A=
      }=0A=
      else if (n =3D=3D "style") {=0A=
        set_css_style(v, e, "");=0A=
      }=0A=
    }=0A=
    dst.appendChild(e);=0A=
  }=0A=
  else if (src.nodeType =3D=3D 3) { /* Node.TEXT_NODE */=0A=
    dst.appendChild(document.createTextNode(src.nodeValue));=0A=
  }=0A=
}=0A=
=0A=
/* =0A=
 * It is unclear that this is the right thing to be calling=0A=
 * from copy_xml_to_html, but it appears that Safari decides=0A=
 * to convert &amp; to the NCR &#35;, and then encodes that=0A=
 * NCR to &%26%2338;.  So, I'm going to treat the DOM Attr=0A=
 * value as a plain string, and run our XML string input=0A=
 * through the decoding routine below.=0A=
 */=0A=
function unescape_xml_string(s) {=0A=
  return s.replace(/&apos;/g, "'")=0A=
          .replace(/&#39;/g,  "'")=0A=
          .replace(/&quot;/g, "\"")=0A=
          .replace(/&#34;/g,  "\"")=0A=
          .replace(/&gt;/g,   ">")=0A=
          .replace(/&#62;/g,  ">")=0A=
          .replace(/&lt;/g,   "<")=0A=
          .replace(/&#60;/g,  "<")=0A=
          .replace(/&amp;/g,  "&")=0A=
          .replace(/&#38;/g,  "&");=0A=
}=0A=
=0A=
/*=0A=
 * Parse set of CSS rules and apply them to an element.=0A=
 * This is quite horrifying, but I'm unable to determine=0A=
 * how else to handle this with IE 6.  FireFox and other=0A=
 * sane browsers let you simply set the style attribute=0A=
 * or use e.style.setProperty(rule, value, priority),=0A=
 * IE 6 appears to have neither of these capabilities..=0A=
 */=0A=
function set_css_style(css, e, priority) {=0A=
  var rules =3D css.split(";");=0A=
  for (var i =3D 0; i < rules.length; i++) {=0A=
    var nvpair =3D rules[i].split(":");=0A=
    if (nvpair.length =3D=3D 2) {=0A=
      try {=0A=
        var name  =3D nvpair[0]; /* style attribute */=0A=
        var value =3D nvpair[1]; /* attribute value */=0A=
  =0A=
        /*=0A=
         * For each possible style attribute, set the=0A=
         * appropriate style property in the element.=0A=
         */=0A=
        if (name =3D=3D "background") {=0A=
           e.style.background =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-attachment") {=0A=
          e.style.backgroundAttachment =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-color") {=0A=
          e.style.backgroundColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-image") {=0A=
          e.style.backgroundImage =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-position") {=0A=
          e.style.backgroundPosition =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-position-x") {=0A=
          e.style.backgroundPositionX =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-position-y") {=0A=
          e.style.backgroundPositionY =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-repeat") {=0A=
          e.style.backgroundRepeat =3D value;=0A=
        }=0A=
        else if (name =3D=3D "behavior") {=0A=
          e.style.behavior =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border") {=0A=
          e.style.border =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-bottom") {=0A=
          e.style.borderBottom =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-bottom-color") {=0A=
          e.style.borderBottomColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-bottom-style") {=0A=
          e.style.borderBottomStyle =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-bottom-width") {=0A=
          e.style.borderBottomWidth =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-collapse") {=0A=
          e.style.borderCollapse =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-color") {=0A=
          e.style.borderColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-left") {=0A=
          e.style.borderLeft =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-left-color") {=0A=
          e.style.borderLeftColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-left-style") {=0A=
          e.style.borderLeftStyle =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-left-width") {=0A=
          e.style.borderLeftWidth =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-right") {=0A=
          e.style.borderRight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-right-color") {=0A=
          e.style.borderRightColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-right-style") {=0A=
          e.style.borderRightStyle =3D value;=0A=
        }=0A=
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}=0A=

------=_NextPart_000_0000_01C99B66.30C8DF50
Content-Type: application/octet-stream
Content-Transfer-Encoding: quoted-printable
Content-Location: http://theoncologist.alphamedpress.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_01C99B66.30C8DF50
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"query";=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"wp";	_uOkw[27]=3D"szukaj";=0A=
_uOsr[28]=3D"onet";	_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=
_uOsr[34]=3D"kvasir";	_uOkw[34]=3D"searchExpr";=0A=
_uOsr[35]=3D"sesam";	_uOkw[35]=3D"q";=0A=
_uOsr[36]=3D"ozu"; _uOkw[36]=3D"q";=0A=
_uOsr[37]=3D"terra"; _uOkw[37]=3D"query";=0A=
_uOsr[38]=3D"nostrum"; _uOkw[38]=3D"query";=0A=
_uOsr[39]=3D"mynet"; _uOkw[39]=3D"q";=0A=
_uOsr[40]=3D"ekolay"; _uOkw[40]=3D"q";=0A=
_uOsr[41]=3D"search.ilse"; _uOkw[41]=3D"search_for";=0A=
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//-- Auto/Organic Keywords to Ignore=0A=
var _uOno=3Dnew Array();=0A=
//_uOno[0]=3D"urchin";=0A=
//_uOno[1]=3D"urchin.com";=0A=
//_uOno[2]=3D"www.urchin.com";=0A=
=0A=
//-- Referral domains to Ignore=0A=
var _uRno=3Dnew Array();=0A=
//_uRno[0]=3D".urchin.com";=0A=
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//-- **** Don't modify below this point ***=0A=
var =
_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"1.3";=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=
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 if (_utimeout && _utimeout!=3D"") {=0A=
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  _ubd.cookie=3D"__utmb=3D"+b+"; path=3D"+_utcp+";"+x+_udo;=0A=
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   b =3D ("-" =3D=3D b) ? _udh : b;  =0A=
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  _ubd.cookie=3D"__utma=3D"+a+"; path=3D"+_utcp+";"+nx+_udo;=0A=
  _ubd.cookie=3D"__utmb=3D"+_udh+"; path=3D"+_utcp+";"+x+_udo;=0A=
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 if (_ulink && xx && xx!=3D"" && xx!=3D"-") {=0A=
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path=3D"+_utcp+";"+nx+_udo;=0A=
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 if (_ulink && v && v!=3D"" && v!=3D"-") {=0A=
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 var wc=3Dwindow;=0A=
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path=3D"+_utcp+";"+nx+_udo;=0A=
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function _uGH() {=0A=
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function _uInfo(page) {=0A=
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 if (!_ur || _ur=3D=3D"") { _ur=3D"-"; }=0A=
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  if ((p>=3D0) && (p<=3D8)) { _ur=3D"0"; }=0A=
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_ur.lastIndexOf("]")=3D=3D(_ur.length-1)) { _ur=3D"-"; }=0A=
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s+=3D"&utmdt=3D"+_uES(_ubd.title);=0A=
 if (_udl.hostname && _udl.hostname!=3D"") =
s+=3D"&utmhn=3D"+_uES(_udl.hostname);=0A=
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i2.src=3D_ugifpath2+"?"+"utmwv=3D"+_uwv+s+"&utmac=3D"+_uacct+"&utmcc=3D"+=
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}=0A=
function _uVoid() { return; }=0A=
function _uCInfo() {=0A=
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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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t3!=3D"")) {=0A=
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c+=3D"utmcsr=3D"+_uEC(t2); }=0A=
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c+=3D"utmgclid=3D"+_uEC(t3); }=0A=
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c+=3D"|utmctr=3D"+_uEC(t); }=0A=
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c=3D"utmccn=3D(direct)|utmcsr=3D(direct)|utmcmd=3D(none)"; }=0A=
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 if (cs=3D=3D0 || _ufns=3D=3D1) {=0A=
  t=3D_uGC(dc,"__utma=3D"+_udh+".",";");=0A=
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path=3D"+_utcp+"; "+x+_udo;=0A=
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 if (cs=3D=3D0 || _ufns=3D=3D1) return "&utmcn=3D1";=0A=
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function _uRef() {=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=
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"utmccn=3D(referral)|utmcsr=3D"+_uEC(h)+"|"+"utmcct=3D"+_uEC(k)+"|utmcmd=3D=
referral";=0A=
}=0A=
function _uOrg(t) {=0A=
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 if ((i=3D_ur.indexOf("://"))<0 || _uGCse()) return "";=0A=
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 if (h.indexOf("/") > -1) {=0A=
  h=3Dh.substring(0,h.indexOf("/"));=0A=
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 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=
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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=
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}=0A=
function _uGCse() {=0A=
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function _uBInfo() {=0A=
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  var j=3Djava.awt.Toolkit.getDefaultToolkit();=0A=
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 if (n.language) { ul=3Dn.language.toLowerCase(); }=0A=
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 if (_uflash) fl=3D_uFlash();=0A=
 if (_ubd.characterSet) cs=3D_uES(_ubd.characterSet);=0A=
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 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=
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 if (_userv=3D=3D0 || _userv=3D=3D2) i=3Dnew Array();=0A=
 if (_userv=3D=3D1 || _userv=3D=3D2) { i2=3Dnew Array(); c=3D_uGCS(); }=0A=
=0A=
 for (var ii=3D0;ii<l.length;ii++) {=0A=
  l[ii]=3D_uTrim(l[ii]);=0A=
  if (l[ii].charAt(0)!=3D'T' && l[ii].charAt(0)!=3D'I') continue;=0A=
  var r=3DMath.round(Math.random()*2147483647);=0A=
  if (!_utsp || _utsp=3D=3D"") _utsp=3D"|";=0A=
  var f=3Dl[ii].split(_utsp),s=3D"";=0A=
  if (f[0].charAt(0)=3D=3D'T') {=0A=
   s=3D"&utmt=3Dtran"+"&utmn=3D"+r;=0A=
   f[1]=3D_uTrim(f[1]); if(f[1]&&f[1]!=3D"") =
s+=3D"&utmtid=3D"+_uES(f[1]);=0A=
   f[2]=3D_uTrim(f[2]); if(f[2]&&f[2]!=3D"") =
s+=3D"&utmtst=3D"+_uES(f[2]);=0A=
   f[3]=3D_uTrim(f[3]); if(f[3]&&f[3]!=3D"") =
s+=3D"&utmtto=3D"+_uES(f[3]);=0A=
   f[4]=3D_uTrim(f[4]); if(f[4]&&f[4]!=3D"") =
s+=3D"&utmttx=3D"+_uES(f[4]);=0A=
   f[5]=3D_uTrim(f[5]); if(f[5]&&f[5]!=3D"") =
s+=3D"&utmtsp=3D"+_uES(f[5]);=0A=
   f[6]=3D_uTrim(f[6]); if(f[6]&&f[6]!=3D"") =
s+=3D"&utmtci=3D"+_uES(f[6]);=0A=
   f[7]=3D_uTrim(f[7]); if(f[7]&&f[7]!=3D"") =
s+=3D"&utmtrg=3D"+_uES(f[7]);=0A=
   f[8]=3D_uTrim(f[8]); if(f[8]&&f[8]!=3D"") =
s+=3D"&utmtco=3D"+_uES(f[8]);=0A=
  } else {=0A=
   s=3D"&utmt=3Ditem"+"&utmn=3D"+r;=0A=
   f[1]=3D_uTrim(f[1]); if(f[1]&&f[1]!=3D"") =
s+=3D"&utmtid=3D"+_uES(f[1]);=0A=
   f[2]=3D_uTrim(f[2]); if(f[2]&&f[2]!=3D"") =
s+=3D"&utmipc=3D"+_uES(f[2]);=0A=
   f[3]=3D_uTrim(f[3]); if(f[3]&&f[3]!=3D"") =
s+=3D"&utmipn=3D"+_uES(f[3]);=0A=
   f[4]=3D_uTrim(f[4]); if(f[4]&&f[4]!=3D"") =
s+=3D"&utmiva=3D"+_uES(f[4]);=0A=
   f[5]=3D_uTrim(f[5]); if(f[5]&&f[5]!=3D"") =
s+=3D"&utmipr=3D"+_uES(f[5]);=0A=
   f[6]=3D_uTrim(f[6]); if(f[6]&&f[6]!=3D"") =
s+=3D"&utmiqt=3D"+_uES(f[6]);=0A=
  }=0A=
  if (_udl.hostname && _udl.hostname!=3D"") =
s+=3D"&utmhn=3D"+_uES(_udl.hostname);=0A=
  if (_usample && _usample !=3D 100) s+=3D"&utmsp=3D"+_uES(_usample);=0A=
=0A=
  if ((_userv=3D=3D0 || _userv=3D=3D2) && _uSP()) {=0A=
   i[ii]=3Dnew Image(1,1);=0A=
   i[ii].src=3D_ugifpath+"?"+"utmwv=3D"+_uwv+s;=0A=
   i[ii].onload=3Dfunction() { _uVoid(); }=0A=
  }=0A=
  if ((_userv=3D=3D1 || _userv=3D=3D2) && _uSP()) {=0A=
   i2[ii]=3Dnew Image(1,1);=0A=
   =
i2[ii].src=3D_ugifpath2+"?"+"utmwv=3D"+_uwv+s+"&utmac=3D"+_uacct+"&utmcc=3D=
"+c;=0A=
   i2[ii].onload=3Dfunction() { _uVoid(); }=0A=
  }=0A=
 }=0A=
 return;=0A=
}=0A=
function _uFlash() {=0A=
 var f=3D"-",n=3Dnavigator;=0A=
 if (n.plugins && n.plugins.length) {=0A=
  for (var ii=3D0;ii<n.plugins.length;ii++) {=0A=
   if (n.plugins[ii].name.indexOf('Shockwave Flash')!=3D-1) {=0A=
    f=3Dn.plugins[ii].description.split('Shockwave Flash ')[1];=0A=
    break;=0A=
   }=0A=
  }=0A=
 } else {=0A=
  var fl;=0A=
  try {=0A=
   fl =3D new ActiveXObject("ShockwaveFlash.ShockwaveFlash.7");=0A=
   f =3D fl.GetVariable("$version");=0A=
  } catch(e) {}=0A=
  if (f =3D=3D "-") {=0A=
   try {=0A=
    fl =3D new ActiveXObject("ShockwaveFlash.ShockwaveFlash.6");=0A=
    f =3D "WIN 6,0,21,0";=0A=
    fl.AllowScriptAccess =3D "always";=0A=
    f =3D fl.GetVariable("$version");=0A=
   } catch(e) {}=0A=
  }=0A=
  if (f =3D=3D "-") {=0A=
   try {=0A=
    fl =3D new ActiveXObject("ShockwaveFlash.ShockwaveFlash");=0A=
    f =3D fl.GetVariable("$version");=0A=
   } catch(e) {}=0A=
  }=0A=
  if (f !=3D "-") {=0A=
   f =3D f.split(" ")[1].split(",");=0A=
   f =3D f[0] + "." + f[1] + " r" + f[2];=0A=
  }=0A=
 }=0A=
 return f;=0A=
}=0A=
function __utmLinkerUrl(l,h) {=0A=
 var p,k,a=3D"-",b=3D"-",c=3D"-",x=3D"-",z=3D"-",v=3D"-";=0A=
 var dc=3D_ubd.cookie;=0A=
 var iq =3D l.indexOf("?");=0A=
 var ih =3D l.indexOf("#");=0A=
 var url=3Dl;=0A=
 if (dc) {=0A=
  a=3D_uES(_uGC(dc,"__utma=3D"+_udh+".",";"));=0A=
  b=3D_uES(_uGC(dc,"__utmb=3D"+_udh,";"));=0A=
  c=3D_uES(_uGC(dc,"__utmc=3D"+_udh,";"));=0A=
  x=3D_uES(_uGC(dc,"__utmx=3D"+_udh,";"));=0A=
  z=3D_uES(_uGC(dc,"__utmz=3D"+_udh+".",";"));=0A=
  v=3D_uES(_uGC(dc,"__utmv=3D"+_udh+".",";"));=0A=
  k=3D(_uHash(a+b+c+x+z+v)*1)+(_udh*1);=0A=
  =
p=3D"__utma=3D"+a+"&__utmb=3D"+b+"&__utmc=3D"+c+"&__utmx=3D"+x+"&__utmz=3D=
"+z+"&__utmv=3D"+v+"&__utmk=3D"+k;=0A=
 }=0A=
 if (p) {=0A=
  if (h && ih>-1) return;=0A=
  if (h) { url=3Dl+"#"+p; }=0A=
  else {=0A=
   if (iq=3D=3D-1 && ih=3D=3D-1) url=3Dl+"?"+p;=0A=
   else if (ih=3D=3D-1) url=3Dl+"&"+p;=0A=
   else if (iq=3D=3D-1) url=3Dl.substring(0,ih-1)+"?"+p+l.substring(ih);=0A=
   else url=3Dl.substring(0,ih-1)+"&"+p+l.substring(ih);=0A=
  }=0A=
 }=0A=
 return url;=0A=
}=0A=
function __utmLinker(l,h) {=0A=
 if (!_ulink || !l || l=3D=3D"") return;=0A=
 _udl.href=3D__utmLinkerUrl(l,h);=0A=
}=0A=
function __utmLinkPost(f,h) {=0A=
 if (!_ulink || !f || !f.action) return;=0A=
 f.action=3D__utmLinkerUrl(f.action, h);=0A=
 return;=0A=
}=0A=
function __utmSetVar(v) {=0A=
 if (!v || v=3D=3D"") return;=0A=
 if (!_udo || _udo =3D=3D "") {=0A=
  _udh=3D_uDomain();=0A=
  if (_udn && _udn!=3D"") { _udo=3D" domain=3D"+_udn+";"; }=0A=
 }=0A=
 if (!_uVG()) return;=0A=
 var r=3DMath.round(Math.random() * 2147483647);=0A=
 _ubd.cookie=3D"__utmv=3D"+_udh+"."+_uES(v)+"; path=3D"+_utcp+"; =
expires=3D"+_uNx()+";"+_udo;=0A=
 var s=3D"&utmt=3Dvar&utmn=3D"+r;=0A=
 if (_usample && _usample !=3D 100) s+=3D"&utmsp=3D"+_uES(_usample);=0A=
 if ((_userv=3D=3D0 || _userv=3D=3D2) && _uSP()) {=0A=
  var i=3Dnew Image(1,1);=0A=
  i.src=3D_ugifpath+"?"+"utmwv=3D"+_uwv+s;=0A=
  i.onload=3Dfunction() { _uVoid(); }=0A=
 }=0A=
 if ((_userv=3D=3D1 || _userv=3D=3D2) && _uSP()) {=0A=
  var i2=3Dnew Image(1,1);=0A=
  =
i2.src=3D_ugifpath2+"?"+"utmwv=3D"+_uwv+s+"&utmac=3D"+_uacct+"&utmcc=3D"+=
_uGCS();=0A=
  i2.onload=3Dfunction() { _uVoid(); }=0A=
 }=0A=
}=0A=
function _uGCS() {=0A=
 var t,c=3D"",dc=3D_ubd.cookie;=0A=
 if ((t=3D_uGC(dc,"__utma=3D"+_udh+".",";"))!=3D"-") =
c+=3D_uES("__utma=3D"+t+";+");=0A=
 if ((t=3D_uGC(dc,"__utmx=3D"+_udh,";"))!=3D"-") =
c+=3D_uES("__utmx=3D"+t+";+");=0A=
 if ((t=3D_uGC(dc,"__utmz=3D"+_udh+".",";"))!=3D"-") =
c+=3D_uES("__utmz=3D"+t+";+");=0A=
 if ((t=3D_uGC(dc,"__utmv=3D"+_udh+".",";"))!=3D"-") =
c+=3D_uES("__utmv=3D"+t+";");=0A=
 if (c.charAt(c.length-1)=3D=3D"+") c=3Dc.substring(0,c.length-1);=0A=
 return c;=0A=
}=0A=
function _uGC(l,n,s) {=0A=
 if (!l || l=3D=3D"" || !n || n=3D=3D"" || !s || s=3D=3D"") return "-";=0A=
 var i,i2,i3,c=3D"-";=0A=
 i=3Dl.indexOf(n);=0A=
 i3=3Dn.indexOf("=3D")+1;=0A=
 if (i > -1) {=0A=
  i2=3Dl.indexOf(s,i); if (i2 < 0) { i2=3Dl.length; }=0A=
  c=3Dl.substring((i+i3),i2);=0A=
 }=0A=
 return c;=0A=
}=0A=
function _uDomain() {=0A=
 if (!_udn || _udn=3D=3D"" || _udn=3D=3D"none") { _udn=3D""; return 1; }=0A=
 if (_udn=3D=3D"auto") {=0A=
  var d=3D_ubd.domain;=0A=
  if (d.substring(0,4)=3D=3D"www.") {=0A=
   d=3Dd.substring(4,d.length);=0A=
  }=0A=
  _udn=3Dd;=0A=
 }=0A=
 _udn =3D _udn.toLowerCase(); =0A=
 if (_uhash=3D=3D"off") return 1;=0A=
 return _uHash(_udn);=0A=
}=0A=
function _uHash(d) {=0A=
 if (!d || d=3D=3D"") return 1;=0A=
 var h=3D0,g=3D0;=0A=
 for (var i=3Dd.length-1;i>=3D0;i--) {=0A=
  var c=3DparseInt(d.charCodeAt(i));=0A=
  h=3D((h << 6) & 0xfffffff) + c + (c << 14);=0A=
  if ((g=3Dh & 0xfe00000)!=3D0) h=3D(h ^ (g >> 21));=0A=
 }=0A=
 return h;=0A=
}=0A=
function _uFixA(c,s,t) {=0A=
 if (!c || c=3D=3D"" || !s || s=3D=3D"" || !t || t=3D=3D"") return "-";=0A=
 var a=3D_uGC(c,"__utma=3D"+_udh+".",s);=0A=
 var lt=3D0,i=3D0;=0A=
 if ((i=3Da.lastIndexOf(".")) > 9) {=0A=
  _uns=3Da.substring(i+1,a.length);=0A=
  _uns=3D(_uns*1)+1;=0A=
  a=3Da.substring(0,i);=0A=
  if ((i=3Da.lastIndexOf(".")) > 7) {=0A=
   lt=3Da.substring(i+1,a.length);=0A=
   a=3Da.substring(0,i);=0A=
  }=0A=
  if ((i=3Da.lastIndexOf(".")) > 5) {=0A=
   a=3Da.substring(0,i);=0A=
  }=0A=
  a+=3D"."+lt+"."+t+"."+_uns;=0A=
 }=0A=
 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=
  return s;=0A=
}=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=
&7)<<2)+(t>>30&3)]+c[t>>25&m]+c[t>>20&m]+"-"+c[t>>15&m]+c[t>>10&m]+c[t>>5=
&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=
  if ((c<"0" || c>"9") && (c!=3D".")) return false;=0A=
 }=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=
  return escape(s);=0A=
 }=0A=
}=0A=
function _uUES(s) {=0A=
 if (typeof(decodeURIComponent) =3D=3D 'function') {=0A=
  return decodeURIComponent(s);=0A=
 } else {=0A=
  return unescape(s);=0A=
 }=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 && _utk.indexOf("=3D")=3D=3D-1) =
{=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=

------=_NextPart_000_0000_01C99B66.30C8DF50--

