Clinical Trial Substantiates the Predictive Value of <b> <i>O-6-Methylguanine-DNA Methyltransferase</i> </b> Promoter Methylation in Glioblastoma Patients Treated with Temozolomide

This prospective clinical trial identifies MGMT-methylation status as an independent predictor for glioblastoma patients treated with a methylating agent. The association of the epigenetic inactivation of the DNA repair gene MGMT with better outcome in this homogenous cohort may have important implications for the design of future trials and supports efforts to deplete MGMT by O-6-benzylguanine, a noncytotoxic substrate of this enzyme.