Kaplan–Meier curves for a, b) progression-free survival (PFS) and c, d) overall survival (OS) in a, c) large-cell neuroendocrine carcinoma patients and b, d) small-cell lung cancer patients according to the use of thoracic radiotherapy (TRT). Kaplan–Meier curves for a, b) progression-free survival (PFS) and c, d) overall survival (OS) in a, c) large-cell neuroendocrine carcinoma patients and b, d) small-cell lung cancer patients according to the use of thoracic radiotherapy (TRT). CT: chemotherapy. Arsela Prelaj et al. ERJ Open Res 2017;3:00128-2016 ©2017 by European Respiratory Society