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01-05-2015 | Laboratory Investigation

Impact on prognosis of the regional distribution of MGMT methylation with respect to the CpG island methylator phenotype and age in glioma patients

Authors: Pilar Mur, Ángel Rodríguez de Lope, Francisco Javier Díaz-Crespo, Teresa Hernández-Iglesias, Teresa Ribalta, Concepción Fiaño, Juan Fernando García, Juan Antonio Rey, Manuela Mollejo, Bárbara Meléndez

Published in: Journal of Neuro-Oncology | Issue 3/2015

Abstract

Clinical and molecular prognostic factors in gliomas include age, IDH mutation, the glioma CpG island methylator phenotype (G-CIMP+) and promoter methylation of the O⁶-methylguanine DNA-methyltransferase (MGMT) gene. Among these markers, a predictive value was reported in glioblastomas (GBM) for MGMT promoter methylation, in particular in elderly GBM patients. In this study, methylation data from 46 glioma samples with the Illumina 450K platform were obtained and extended using external data to include a total of 247 glioma samples. Methylation analysis of the whole MGMT gene with this platform revealed two strongly survival-associated CpG regions within the promoter and the gene body, which were confirmed in a reported dataset of high grade-gliomas. Methylation at the promoter (CpG 25, cg12981137 and the prognostic model MGMT-STP27) and at the gene body CpG 165 (cg07933035), were significantly associated with better overall survival, and strongly correlated with G-CIMP+ status. In this series, the prognostic value of MGMT methylation at the promoter was not observed in G-CIMP− cases, although around 50 % of them were MGMT-methylated. These results were also obtained in an homogeneously-treated series of chemoradiated G-CIMP− GBMs analyzed by MSP and qMSP, and confirmed in a reported pyrosequencing-analyzed series of gliomas. Interestingly, in contrast to the MGMT promoter, gene body methylation was of prognostic value in G-CIMP−patients older than 65 years. Our study highlights the relevance of the prognostic value of the different regions of methylation throughout the MGMT gene that could be affected by specific G-CIMP profiles and age groups.

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Title: Impact on prognosis of the regional distribution of MGMT methylation with respect to the CpG island methylator phenotype and age in glioma patients
Authors: Pilar Mur
Ángel Rodríguez de Lope
Francisco Javier Díaz-Crespo
Teresa Hernández-Iglesias
Teresa Ribalta
Concepción Fiaño
Juan Fernando García
Juan Antonio Rey
Manuela Mollejo
Bárbara Meléndez
Publication date: 01-05-2015
Publisher: Springer US
Published in: Journal of Neuro-Oncology / Issue 3/2015
Print ISSN: 0167-594X
Electronic ISSN: 1573-7373
DOI: https://doi.org/10.1007/s11060-015-1738-9

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Impact on prognosis of the regional distribution of MGMT methylation with respect to the CpG island methylator phenotype and age in glioma patients

Abstract

Keynote webinar | Spotlight on medication adherence

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Abstract

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