Glioblastoma, according to the CNS5 classification, is defined as a diffuse astrocytic WHO grade 4 glioma, IDH wild type, and H3 wild type, that has one or more of the following histological or genetic features: microvascular proliferation, necrosis, TERT promoter mutation, EGFR amplification, and +7/−10 chromosome and copy-number changes at chromosomes 7 (gains and amplifications) and 10 (losses) [1,2]. The gene discussed is EGFR; the disease is glioblastoma.