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Published in: Acta Neuropathologica Communications 1/2014

Open Access 01-12-2014 | Research

Prognostic and predictive markers in recurrent high grade glioma; results from the BR12 randomised trial

Authors: Vincent Peter Collins, Koichi Ichimura, Ying Di, Danita Pearson, Ray Chan, Lindsay C Thompson, Rhian Gabe, Michael Brada, Sally P Stenning

Published in: Acta Neuropathologica Communications | Issue 1/2014

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Abstract

We evaluated the prognostic and predictive value of a range of molecular changes in the setting of a randomised trial comparing standard PCV (procarbazine, CCNU (1-(2-chloroethyl)-3-cyclohexyl-1-nitrosourea) and vincristine) chemotherapy with the standard temozolomide (TMZ) 5-day (200 mg/m2/day) schedule and a 21-day (100 mg/m2/day) schedule in chemo-naïve, high-grade glioma (non-oligodendroglial tumours; WHO (World Health Organisation) grades III and IV) patients at first progression following radiotherapy.
354 samples (79.2%) from the first operation of the 447 randomised patients provided enough tumour DNA for some or all parts of the study. Genome-wide array comparative genomic hybridisation (aCGH), mutation analysis of IDH1/2 and TP53 and methylation analyses of the MGMT CpG-island was done.
84% of grade III tumours and 17% of grade IV had IDH1 or IDH2 mutations that conferred a better prognosis in both; MGMT methylation (defined as average value across 16 CpGs ≥ 10%) occurred in 75% of tumours and was also associated with improved survival. Both were of independent prognostic value after accounting for clinical factors and tumour grade. None of the molecular changes investigated gave clear evidence of a predictive benefit of TMZ over PCV or 21-day TMZ over 5-day TMZ although power was limited and a role for MGMT methylation could not be ruled out. Loss of 1p and 19q was seen in only 4 patients although hemizygous loss of 1p36 occurred in 20%.
The findings support reports that IDH1/2 mutations and MGMT methylation can be used in addition to tumour grade and clinical factors to predict survival in patients with recurrent high grade gliomas when treated with any of the therapy regimes used.
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Metadata
Title
Prognostic and predictive markers in recurrent high grade glioma; results from the BR12 randomised trial
Authors
Vincent Peter Collins
Koichi Ichimura
Ying Di
Danita Pearson
Ray Chan
Lindsay C Thompson
Rhian Gabe
Michael Brada
Sally P Stenning
Publication date
01-12-2014
Publisher
BioMed Central
Published in
Acta Neuropathologica Communications / Issue 1/2014
Electronic ISSN: 2051-5960
DOI
https://doi.org/10.1186/2051-5960-2-68

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