EGFR and glioblastoma: Spearman’s test showed a significant positive correlation between mRNA and protein expression for genes EGFR (p < 0.001) and PTEN (p < 0.001) in DA, AKT1, AKT2, and GSK3β (p < 0.05), and EGFR and PTEN (p < 0.001) in AA, and AKT2 (p = 0.031), GSK3β (p = 0.025) and EGFR (p < 0.001) in GBM (Table 6).