MGMT and glioblastoma: Thirteen patients (72%) had GBM (of these, 6 were with methylated, 6 unmethylated, and 1 with unknown MGMT promoter methylation status); 2 patients had astrocytoma, IDH-mutant, grade 3 (one with methylated and one with unknown MGMT promoter status), and 3 patients had astrocytoma, IDH-mutant, grade 4 (2 with methylated and one with unmethylated MGMT promoter status).