Impact on prognosis of the regional distribution of MGMT methylation with respect to the CpG island methylator phenotype and age ... View Full Text


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Article Info

DATE

2015-02-15

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

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. More... »

PAGES

441-450

References to SciGraph publications

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  • 2013-05-21. Codeletion of 1p and 19q determines distinct gene methylation and expression profiles in IDH-mutated oligodendroglial tumors in ACTA NEUROPATHOLOGICA
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  • 2010-11-30. Comparison of Beta-value and M-value methods for quantifying methylation levels by microarray analysis in BMC BIOINFORMATICS
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    http://scigraph.springernature.com/pub.10.1007/s11060-015-1738-9

    DOI

    http://dx.doi.org/10.1007/s11060-015-1738-9

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1050176286

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/25682093


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