...1,729 NSCLC samples originated from 1,586 NSCLC patients of whom 134 had an EGFR mutation (8.2%)….Patients with concurrent EGFR mutations and amplifications (estimated within sample) treated with EGFR-TKI had a significantly worse overall survival compared with those without concurrent EGFR amplifications...The presence of EGFR amplifications in EGFR mutant patients is predictive of a worse overall survival.