MGMT and glioblastoma: We did not find a significant correlation between the Ki-67 index and the methylation status of the MGMT promoter (p ≥ 0.067), enhancer 3 (p ≥ 0.073) or enhancer 4 (p ≥ 0.094), independent if GBM samples were stratified by their MGMT promoter methylation status or not.