Figure 1. Results from the Mann-Whitney U-test and correlation analyses comparing mRNA levels of (A) HLA-E in glioblastoma (GBM) and nontumor tissues (p=0.0001); (B) HLA-F in GBM and non-tumor tissues (p=0.0014); (C) HLA-E and HLA-F in all tissue samples (Spearman r=0.6988; p<0.0001); (D) HLA-E in GBM samples with methylated and unmethylated O-6-methylguanine-DNA methyltransferase (MGMT) promoter (MGMT+ and MGMT-, respectively; p=0.0477); (E) HLA-F in MGMT+ and MGMT- GBM samples (p=0.0172).