Overview A Study About Safety and Efficacy of Pirfenidone to Treat Grade 2 or Grade3 Radiation-induced Lung Injury. Status: Recruiting Trial end date: 2022-06-30 Target enrollment: Participant gender: Summary Using Pirfenidone to treat Grade 2 or Grade3 radiation-induced lung injury, and observe the efficacy and safety of the drug. Phase: Phase 2 Details Lead Sponsor: Beijing Continent Pharmaceutical Co, Ltd.Treatments: Pirfenidone