This study aims to evaluate the efficacy and safety of neoadjuvant camrelizumab combined with chemotherapy in resectable stage IIIA and IIIB (T3-4N2) non-small cell lung cancer (NSCLC) patients. Inclusion criteria are: age 18-75, pathologically confirmed resectable stage IIIA-IIIB (T3-4N2) NSCLC, absence of EGFR, ALK, and ROS1 gene mutations, and Eastern Cooperative Oncology Group (ECOG) status 0-1. All patients receive three cycles of camrelizumab combined with platinum-based doublet chemotherapy, followed by curative surgery within 4-6 weeks after completion of chemotherapy. Patients undergo 18F-fluorodeoxyglucose (FDG) PET/CT scans in 1 week before treatment and 1 week before surgery, and peripheral blood samples are collected for biomarker analysis. The primary endpoints for follow-up are pathologic complete response (pCR) rate and major pathological response (MPR) rate, while secondary endpoints include safety and progression-free survival. Exploratory endpoints include molecular imaging research and biomarker analysis.

Inclusion Criteria:

• Age 18-75
• Pathologically confirmed resectable stage IIIA-IIIB (T3-4N2) NSCLC
• Absence of EGFR, ALK, and ROS1 gene mutations
• Eastern Cooperative Oncology Group (ECOG) status 0-1
• Signed written informed consent prior to the implementation of any trial-related rocedures
• Adequate organ function, evidenced by laboratory results with no contraindications to chemotherapy: Absolute neutrophil count ≥ 1,500 х109/L, Thrombocytes ≥ 100 х 109/L, Hemoglobin ≥ 90 mg/L, Creatinine ≤ 1.5 x ULN or creatinine clearance (calculated using the Cockcroft-Gault formula) ≥ 40 mL/min, Alanine aminotransferase (ALT) and aspartate aminotransferase (AST) > 2.5 x upper limit of normal (ULN), Alkaline phosphatase (ALP) > 5 x ULN, Bilirubin > 1.5 х ULN

Exclusion Criteria:

• Patients diagnosed with any other malignant tumor
• Have received prior therapy with chemotherapy or immune checkpoint inhibitor
• Insufficient caloric and/or fluid intake despite consultation with a dietitian and/or tube feeding
• Have an active infection requiring systemic therapy that has not resolved 3 days (simple infection, such as cystitis) to 7 days (severe infection, such as pyelonephritis) before the first dose of trial treatment
• Patients who cannot tolerate chemoradiotherapy or surgery due to severe cardiac, lung dysfunction
• A history of interstitial lung disease or non-infectious pneumonia
• Active autoimmune disease with systemic therapy (ie, use of disease modifiers, corticosteroids, or immunosuppressive drugs) in the past 2 years
• Known history of human immunodeficiency virus (HIV) infection (i.e., positive for HIV 1/2 antibody) and various viral hepatitis infections
• Patients who have received allogeneic stem cell or solid organ transplantation
• Women during pregnancy or lactation