OLIG2 and glioblastoma: PN phenotype is sometimes associated with a better survival than MES subtype as illustrated by Pinel et al where high level of Olig2 expression tended to be associated with a better overall survival on TMA samples of 80 GBM.47 In our cohort, initial nuclear expression of Olig2 ≥30% is not associated with a significant improvement in survival.