MGMT and glioblastoma: There was no relation between the delayed edema and other various pathological data including existence of oligo component (yes vs. no, P = 0.999), MIB-1 index (≥25 vs. <25, P = 0.238), mitosis (≥5/10 high-power-field (HPF) vs. <5/10 HPF, P = 0.999), O6-methylguanine-DNA methyltransferase promotor by methylation-specific polymerase chain reaction (methylated vs. unmethylated, P = 0.691), p53 stain by immunohistochemistry (<10% vs. ≥10%, P = 0.697), pathological diagnosis using permanent section (GBM vs. others, P = 0.111), and final clinical diagnosis (GBM vs. others, P = 0.999).