Molecular target therapy is one of the most popular and promising field of NSCLC treatment, and its hotspots includes EGFR (epidermal growth factor receptor), EML4-ALK (echinoderm microtubule associated protein like4-anaplastic lymphoma kinase), etc. Former researches indicated that EML4-ALK fusion and EGFR mutation were excluded mutually. The gene discussed is EML4; the disease is non-small cell lung carcinoma.