Among NSCLC patients with EGFR mutations, approximately 4–10% of patients have EGFR exon 20 insertion (ex20ins) mutations, with 46% of patients having EGFR exon 19 deletion (ex19del) mutations and 38% of patients having the EGFR L858R point mutation [6]. The gene discussed is EGFR; the disease is non-small cell lung carcinoma.