alexa Identification of a CpG island methylator phenotype that defines a distinct subgroup of glioma.

Author(s): Noushmehr H, Weisenberger DJ, Diefes K, Phillips HS, Pujara K,

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Abstract We have profiled promoter DNA methylation alterations in 272 glioblastoma tumors in the context of The Cancer Genome Atlas (TCGA). We found that a distinct subset of samples displays concerted hypermethylation at a large number of loci, indicating the existence of a glioma-CpG island methylator phenotype (G-CIMP). We validated G-CIMP in a set of non-TCGA glioblastomas and low-grade gliomas. G-CIMP tumors belong to the proneural subgroup, are more prevalent among lower-grade gliomas, display distinct copy-number alterations, and are tightly associated with IDH1 somatic mutations. Patients with G-CIMP tumors are younger at the time of diagnosis and experience significantly improved outcome. These findings identify G-CIMP as a distinct subset of human gliomas on molecular and clinical grounds. (c) 2010 Elsevier Inc. All rights reserved.
This article was published in Cancer Cell and referenced in

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