The most common EGFR mutations in NSCLC often referred to as “EGFR‐sensitizing mutations,” are deletions of exon 19 (19Del) and a single amino acid substitution L858R in exon 21 (L858R), which together account for up to 85% of observed EGFR mutations in NSCLC. This evidence concerns the gene EGFR and non-small cell lung carcinoma.