Kaplan–Meier curves of epidermal growth factor receptor tyrosine kinase inhibitor (EGFR-TKI) progression-free survival (PFS) were constructed based on different EGFR mutation types. Kaplan–Meier curves of epidermal growth factor receptor tyrosine kinase inhibitor (EGFR-TKI) progression-free survival (PFS) were constructed based on different EGFR mutation types. PFS curves of lung adenocarcinoma patients aged >50 and ≤50 years were plotted separately for patients with a) del-19, b) L858R and c) uncommon EGFR mutations. Shang-Gin Wu et al. ERJ Open Res 2017;3:00092-2016 ©2017 by European Respiratory Society