Low-Dose Radiation + SBRT + Tislelizumab Plus Platinum-based Chemotherapy in Stage ⅡA-ⅢB Non-small Cell Lung Cancer

Inclusion Criteria: 1. Age ≥ 18 and ≤ 75 years; 2. Patients with untreated stage IIA-IIIB non-small cell lung cancer, diagnosed cytologically or histologically (according to the AJCC 9th edition of thoracic tumor staging); 3. Pulmonary lesions will be assessed as resectable or potentially resectable by a multidisciplinary team, including a thoracic surgeon; 4. At least one imaging-measurable lesion according to the Response Evaluation Criteria in Solid Tumors (RECIST v1.1); 5. Ability to provide tumor tissue or cell wax blocks that meet quality control standards for PD-L1 expression testing. Exclusion Criteria: 1. The pathology is small cell lung cancer (SCLC), including lung cancer mixed with SCLC and non-small cell lung cancer (NSCLC)； 2. Patients with known EGFR-sensitive mutations or ALK fusion. 3. Previously received the following therapies: anti-PD-1, anti-PD-L1 or anti-PD-L2 drugs or another drug that stimulates or synergistically inhibits T cell receptors; 4. Subjects with any known or suspected autoimmune disorder or immunodeficiency, with the following exceptions: hypothyroidism, hormone therapy is not needed, or well controlled at physiological dose; controlled type I diabetes; 5. Active infection requiring systemic treatment.