Fig. 2From: Lung stereotactic body radiation therapy for elderly patients aged ≥ 80 years with pathologically proven early-stage non-small cell lung cancer: a retrospective cohort studyKaplan–Meier curves of overall survival for medically operable and medically inoperable patients. Medically operable patients are represented by the solid line; medically inoperable patients are represented by the dotted lineBack to article page