MGMT and glioblastoma: Prediction of the MGMT methylation status in 241 glioblastoma available from TCGA (TCGA-GBM) with HM-27K data revealed a methylation frequency of 50 % (120/241) (see annotation of samples in supplementary Table S4 that also includes more recent samples analyzed on the HM-450K platform) similar to our M-GBM cohort.