EGFR gene amplification is frequently observed in solid neoplasms including non-small cell lung cancer (NSCLC) and glioblastoma. The EGFR gene (a.k.a. ERBB1 and HER1) is located in the chromosomal region 7p11.2 and encodes a transmembrane glycoprotein acting as a cellular growth factor receptor. The protein belongs to the EGFR (epidermal growth factor receptor) subgroup of the RTK (receptor tyrosine kinase) superfamily also including ERBB2 (HER2), ERBB3 (HER3), and ERBB4 (HER4). Overexpression of EGFR has been shown in a number of tumor entities and is associated with poor prognosis. Glioblastoma is the most common malignant brain tumor in adults, and among the most lethal of all cancers. Glioblastomas are divided into four subtypes: classical, proneural, mesenchymal and neural. EGFR amplification is enriched in the classical subtype.EGFR copy number identified by FISH is thought to be a molecular predictor in neoplasms.