MGMT and neoplasm: PFS - progression-free survival; GTV - Gross tumor volume; PTV - Planning target volume; FLAIR - T2-weighted fluid-attenuated inversion recovery; Dmax - maximum dose; BED - biologically effective dose; RT - radiation therapy; SRS - stereotactic radiosurgery; RC - resection cavity; TTF - tumor treating field; IDH - isocitrate dehydrogenase; MGMT - O6-methylguanine-DNA methyltransferase; TMZ - temozolomide; CCNU - lomustine; BCNU - carmustine; m - months