A total of 204 NSCLC patients with EGFR mutated tumors treated by first generation EGFR TKI with available DNAs were collected from the biomarker France cohort....This study showed that PTEN inactivating mutations, ATM alterations, IDH1 mutations and complex EGFR mutations were predictors of short PFS in patients with a stage 4 lung adenocarcinoma receiving first line EGFR TKI and that PTEN, ATM, IDH1 and KRAS mutations as well as alterations in the MAPK pathway were related to shorter OS.