Both AA and GBM groups showed better survival when PD-L1 expression was negative (estimate survival was 27 months within the range 17.9-36.1 months and 12 months within the range 9.3-14.7, respectively) when compared to PD-L1 positive group (estimate survival was 17 and 4.5 months, respectively), although the difference was not significant. Here, CD274 is linked to glioblastoma.