Besides 19-Del and EGFR exon 21 p.L858R, extensive research has uncovered a wide array of rare EGFR activating or resistant mutations in NSCLC, including EGFR exon 18 p.G719X, EGFR exon 20 p.S768I, EGFR exon 21 p.L861Q, EGFR exon 20 p.T790M, and EGFR exon 20 insertions (20ins). The gene discussed is EGFR; the disease is non-small cell lung carcinoma.