Postoperative Radiotherapy for Postoperative N2 Metastases of NSCLC in the Immunotherapy Era (Phase II)

Inclusion Criteria: * Age: ≥18 years old and ≤75 years old, no gender restriction; Pathologically (histologically or cytologically) confirmed non-small cell lung cancer with multiple N2 metastasis after surgery; No prior radiotherapy, chemotherapy or immunotherapy; At least 3 lymph node metastases confirmed by postoperative pathology; ECOG PS score: 0-2; Expected survival time ≥3 months; Normal major organ function, with basically normal results of blood routine, blood biochemistry and coagulation function tests; Basically normal immune indicators; No severe underlying diseases or severe cardiopulmonary dysfunction. Exclusion Criteria: * Known or suspected active autoimmune diseases, or history of autoimmune diseases (e.g., interstitial pneumonia, colitis, hepatitis, hypophysitis, vasculitis, nephritis, hyperthyroidism, hypothyroidism, etc.); History of immunodeficiency (including positive HIV test), other acquired/congenital immunodeficiency diseases, organ transplantation or allogeneic bone marrow transplantation; Interstitial lung disease, drug-induced pneumonia, radiation pneumonia requiring steroid treatment, symptomatic active pneumonia, or severe pulmonary dysfunction; Poorly controlled cardiovascular symptoms or diseases (e.g., NYHA class II or higher heart failure, unstable angina, myocardial infarction within 1 year, uncontrolled arrhythmia); Active hepatitis B (HBV DNA ≥2000 IU/mL or 10⁴ copies/mL) or hepatitis C (positive anti-HCV and HCV-RNA above detection limit); Hereditary bleeding tendency or coagulation dysfunction; bleeding symptoms within 3 months, or positive fecal occult blood (++ or above); Toxicity from prior anti-tumor therapy not recovered to ≤CTCAE grade 1 (except alopecia); Known or suspected allergy to the study drug; Pregnant or lactating women; Subjects deemed unsuitable for inclusion by the investigator.