EOR, extent of resection; GB, glioblastoma; GTR, gross total resection (100%); KPS, Karnofsky performance score; LTS, long‐term survivors; MGMT, O(6)‐methylguanine methyltransferase; NA, not applicable; OS, overall survival; PFS, progression‐free survival; STR, subtotal resection (≥ 90%); STS, short‐term survivors; TMZ, temozolomide. This evidence concerns the gene MGMT and glioblastoma.