EGFR overexpression is the result of 1) Amplification of the EGFR gene, observed in various cancers including breast cancer,[60] non‐small‐cell lung cancer (NSCLC),[61] and glioblastoma multiforme;[62, 63] 2) Overproduction at the transcriptional level. The gene discussed is EGFR; the disease is glioblastoma.