At the initial diagnosis of NSCLC, 39 patients harbored EGFR exon 19 deletions, 34 had EGFR exon 21 L858R mutation, and 8 had uncommon EGFR mutations (EGFR G719A, L747P, S768I, and exon 20 insertions). The gene discussed is EGFR; the disease is non-small cell lung carcinoma.