NBN and glioblastoma: On multivariate cox regression analysis in the Test dataset, APE1 (p=0.000810), Rad23B (p=0.000167), PMS2 (p=0.000190), NBN (p=0.000846), MGMT (p=0.001326) and PTEN (p=0.001108) were independent predictors of survival in GBM.