EGFR and non-small cell lung carcinoma: In particular, EGFR p.L858R and exon 19del were the predominant subtypes of EGFR mutation in our patients, but their ratio (37.5% vs 12.5%, almost 3:1) was different from another study including 2410 EGFR-mutant nonsquamous NSCLC patients (almost 1:1) [35].