The median time between initial NSCLC diagnosis and EGFR mutation testing was 0.62 months Exon 19 deletion was found in 56 (50.9%) patients, the L858R mutation was detected in 42 (38.2%) patients, and other EGFR mutations were found in 12 (10.9%) patients. The gene discussed is EGFR; the disease is non-small cell lung carcinoma.