EGFR and glioma: The other relevant alterations that drive the pathogenesis of glioma include amplification of the gene coding for epidermal growth factor receptor (EGFR) mutations in the genes encoding telomerase reverse transcriptase (TERT) and tumor suppressor p53, as well as promoter methylation in genes coding for retinoblastoma protein (RB) and cyclin-dependent kinase inhibitor 2A (CDKN2A).