Currently, various molecular markers are being studied in NSCLC, such as epidermal growth factor receptor (EGFR), Kirsten rat sarcoma viral oncogene (KRAS), excision repair cross-complementation 1 (ERCC1), ribonucleotide reductase large subunit M1 (RRM1), vascular endothelial growth factor (VEGF), anaplastic lymphoma kinase (ALK), and mesenchymal-epithelial transition factor (MET). The gene discussed is EGFR; the disease is non-small cell lung carcinoma.