PDGFRA and glioblastoma: Overall, GBM tumors (n = 83) showed higher expression levels for all four genes: 4.11, 3.07, 1.13, and 2.11 FC values for the EGFR (p < 0.01), CDK4 (p < 0.01), MDM4 (p = 0.06), and PDGFRA (p < 0.01) genes, respectively (Table 1 and Figure 1).