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Published in: Acta Neuropathologica 1/2015

01-01-2015 | Original Paper

ATRX and IDH1-R132H immunohistochemistry with subsequent copy number analysis and IDH sequencing as a basis for an “integrated” diagnostic approach for adult astrocytoma, oligodendroglioma and glioblastoma

Authors: David E. Reuss, Felix Sahm, Daniel Schrimpf, Benedikt Wiestler, David Capper, Christian Koelsche, Leonille Schweizer, Andrey Korshunov, David T. W. Jones, Volker Hovestadt, Michel Mittelbronn, Jens Schittenhelm, Christel Herold-Mende, Andreas Unterberg, Michael Platten, Michael Weller, Wolfgang Wick, Stefan M. Pfister, Andreas von Deimling

Published in: Acta Neuropathologica | Issue 1/2015

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Abstract

Diffuse gliomas are represented in the 2007 WHO classification as astrocytomas, oligoastrocytomas and oligodendrogliomas of grades II and III and glioblastomas WHO grade IV. Molecular data on these tumors have a major impact on prognosis and therapy of the patients. Consequently, the inclusion of molecular parameters in the WHO definition of brain tumors is being planned and has been forwarded as the “ISN-Haarlem” consensus. We, here, analyze markers of special interest including ATRX, IDH and 1p/19q codeletion in a series of 405 adult patients. Among the WHO 2007 classified tumors were 152 astrocytomas, 61 oligodendrogliomas, 63 oligoastrocytomas and 129 glioblastomas. Following the concepts of the “ISN-Haarlem”, we rediagnosed the series to obtain “integrated” diagnoses with 155 tumors being astrocytomas, 100 oligodendrogliomas and 150 glioblastomas. In a subset of 100 diffuse gliomas from the NOA-04 trial with long-term follow-up data available, the “integrated” diagnosis had a significantly greater prognostic power for overall and progression-free survival compared to WHO 2007. Based on the “integrated” diagnoses, loss of ATRX expression was close to being mutually exclusive to 1p/19q codeletion, with only 2 of 167 ATRX-negative tumors exhibiting 1p/19q codeletion. All but 4 of 141 patients with loss of ATRX expression and diffuse glioma carried either IDH1 or IDH2 mutations. Interestingly, the majority of glioblastoma patients with loss of ATRX expression but no IDH mutations exhibited an H3F3A mutation. Further, all patients with 1p/19 codeletion carried a mutation in IDH1 or IDH2. We present an algorithm based on stepwise analysis with initial immunohistochemistry for ATRX and IDH1-R132H followed by 1p/19q analysis followed by IDH sequencing which reduces the number of molecular analyses and which has a far better association with patient outcome than WHO 2007.
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Metadata
Title
ATRX and IDH1-R132H immunohistochemistry with subsequent copy number analysis and IDH sequencing as a basis for an “integrated” diagnostic approach for adult astrocytoma, oligodendroglioma and glioblastoma
Authors
David E. Reuss
Felix Sahm
Daniel Schrimpf
Benedikt Wiestler
David Capper
Christian Koelsche
Leonille Schweizer
Andrey Korshunov
David T. W. Jones
Volker Hovestadt
Michel Mittelbronn
Jens Schittenhelm
Christel Herold-Mende
Andreas Unterberg
Michael Platten
Michael Weller
Wolfgang Wick
Stefan M. Pfister
Andreas von Deimling
Publication date
01-01-2015
Publisher
Springer Berlin Heidelberg
Published in
Acta Neuropathologica / Issue 1/2015
Print ISSN: 0001-6322
Electronic ISSN: 1432-0533
DOI
https://doi.org/10.1007/s00401-014-1370-3

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