4. According to the 8th-9th edition of (American Joint Committee on Cancer, AJCC) (stage II-IIIA, for stage IIIB included T3-4N2, T4 only included tumor \> 7cm);
5. Puncture or biopsy samples were tested EGFR/ALK negative;
6. Surgically or potentially resectable after discussion by multidisciplinary team (MDT);
7. Who has not received systemic antitumor therapy and has not received chest radiotherapy;
8. Evaluable lesions in the lung or mediastinum;
9. The organ function level should meet the following criteria one week before enrollment: 1) Bone marrow function: hemoglobin ≥80g/L, white blood cell count ≥4.0\*10\^9/L or neutrophil count ≥1.5\*10\^9/L, platelet count ≥100\*10\^9/L; 2) Liver: total serum bilirubin level ≤1.5 times the normal upper limit, when serum total bilirubin level \> 1.5 times the normal upper limit, direct bilirubin level ≤ normal upper limit, aspartate aminotransferase (AST) and alanine aminotransferase (ALT) ≤2.5 times the normal upper limit; 3) Kidney: blood creatinine level \< 1.5 times the normal upper limit or creatinine clearance ≥50ml/min, urea nitrogen ≤200mg/L; Serum albumin ≥30g/L;
10. Male/female of childbearing age agrees to use contraception during the trial period (surgical ligation or oral contraceptives/IUDs + condom contraception);
11. Sign informed consent.
You may not be if
1. Patients with severe dysfunctions of the heart, lungs and other organs who are not suitable for surgery;
2. Patients with severe autoimmune diseases: active inflammatory bowel disease (including Crohn's disease, ulcerative colitis), rheumatoid arthritis, scleroderma, systemic lupus erythematosus, autoimmune vasculitis (such as Wegener's granuloma), etc;
3. Other malignancies within 5 years (excluding non-melanoma skin cancer and cervical cancer);
4. Patient with active infection, heart failure, heart attack, unstable angina pectoris or unstable arrhythmia within the last 6 months;
5. Congenital or acquired immunodeficiency disorders include human immunodeficiency virus (HIV) or a history of organ transplantation or allogeneic stem cell transplantation;
6. Patients treated with other immunological agents, chemotherapy agents, other drugs in clinical trials and long-term cortisol therapy were excluded;
7. Patients who are allergic or contraindicated to PD-1 inhibitors.
