The mutation status of the isocitrate dehydrogenase (IDH) gene and the amplification of platelet-derived growth factor receptor (PDGFR) and epidermal growth factor receptor (EGFR) is of importance in the diagnosis and prognosis of glioma (Verhaak et al., 2010; Leu et al., 2013; The Cancer Genome Atlas Research Network, 2015). Here, EGFR is linked to glioma.