The following variables, listed in order of importance (Table 4), were identified as independent predictors for longer survival: MGMT promoter hypermethylation (vs. unmethylated MGMT promoter), non-central tumor location including the interaction term with time, CRET (vs. no CRET), WHO PS 0–1 (vs. WHO PS 2–4), unilateral tumor location, one lobe involved, younger age and no comorbidities. Here, MGMT is linked to neoplasm.