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Kaplan–Meier curves of (a, c) PFS and (b, d) OS at LD stage with or without thoracic RT. (a) and (b): patients with ILD. (c) and (d), patients with IPF. ILD, interstitial lung disease; IPF, idiopathic pulmonary fibrosis; LD, limited disease; OS, overall survival; PFS, progression-free survival; RT, radiotherapy.
