Inclusion Criteria:
1. 18-75 years old, male and female;
2. ECOG PS 0-1;
3. Histologically or cytologically confirmed operable stage II-III NSCLC (stages II, IIIA, and T3N2M0 IIIB) according to the UICC and AJCC 8th edition TNM staging system. Non-massive metastases (short diameter ≤2cm Lymph nodes) with expected complete resectable N2;
4. With a measurable lesions (per RECIST 1.1 standard, tumor lesions on CT scan length to diameter 10 mm, or lymph node lesions on CT scans short diameter 15 mm or higher);
5. Anti-tumor treatment (radiotherapy, chemotherapy, surgery, and targeted therapy) naive enrollment;
6. Enough of lung function to go through R0 resection with a purpose of cure;
7. Normal main organs function, should meet the following criteria: (1) the blood routine examination shall meet within 14 days (without blood transfusion, hematopoietic factor not used and unused drugs to correct) a. ANC≥1.8 x 109 / L; B. Hb≥100 g/L; C. PLT ≥ 125×109/L; (2) Biochemical examination must meet the following criteria: a. TBIL ≤ 1.5ULN; B. ALT、AST≤2.5 ULN; Serum creatinine sCr≤1.5ULN, endogenous creatinine clearance≥50ml/min (Cockcroft-Gault formula)
Exclusion criteria
1. Known EGFR or ALK mutation;
2. T4 tumors invading the heart, great vessels, trachea, recurrent laryngeal nerve, esophagus, vertebral body, tracheal carina, Upper sulcus lung cancer;
3. Use of immunosuppressive drugs within 4 weeks before the first dose of study drug, excluding nasal spray and inhaled corticosteroids or physiological doses of systemic steroids (i.e., ≤10 mg/day of prednisolone or other corticosteroids at physiological doses of equivalent drugs, with discontinuation of the drug for ≥1 week);
4. Received immunoregulatory effects of herbal medicine or Immune regulating effect of drugs (including thymosin, interferon, interleukin, except for local control Pleural effusion use) within 4 weeks before the first use of the study drug;
5. Malignant tumors other than NSCLC occurred within 5 years before enrollment.
6. Administered Live attenuated vaccine ≤ 4 weeks before the first dose or will be planned for the duration of the study；
7. Current are participating in clinical research and treatment of intrusive, or within 4 weeks before the first delivery received study drugs or other treatments; Not fully recovered from any intervention-related toxicity and/or complications before the first dose (i.e., ≤ grade 1 or baseline, excluding fatigue or alopecia)；
8. Severe infection (e.g., requiring intravenous antibiotics, antifungal or antiviral drugs) within 4 weeks before the first dose, or unexplained fever during screening/before the first dose. 38.5°C；
9. Have or suspected a history of pneumonia/interstitial lung disease or any lung disease that would interfere with pulmonary function testing;
10. With any active history of autoimmune disease or autoimmune diseases; Patients with complete remission of childhood asthma without any intervention in adulthood or with vitiligo were eligible;
11. With congenital or acquired immune function defects, such as human immunodeficiency virus (HIV) infection, active hepatitis B, hepatitis C, hepatitis B and hepatitis C infection together and alcoholic liver cirrhosis patients;
12. Patients with grade II or higher myocardial ischemia or myocardial infarction, poorly controlled arrhythmia (including QTc interval ≥450ms in men and ≥470ms in women). According to NYHA standard, grade III \~ Ⅳ cardiac insufficiency, or heart colour to exceed examination prompt left ventricular ejection fraction (LVEF) \< 50% into the group of the first six months happened myocardial infarction, heart failure, New York heart association class II or above has not been control angina pectoris, out of control of severe ventricular arrhythmia, with clinical significance of cardiac disease, Or abnormal electrocardiogram (ecg) indicate that acute ischemia or active conduction system;
13. Alanine aminotransferase (ALT), aspartate aminotransferase (AST) more than 2 times the upper limit of normal value, or total bilirubin more than 1.5 times the upper limit of normal value (ULN); Creatine kinase (CK) was more than 3 times the upper limit of normal; There were major hemorrhagic events or arteriovenous thrombotic events
14. Known history of allogeneic organ transplantation or allogeneic hematopoietic stem cell transplantation;
15. Known allergy, hypersensitivity, or intolerance to the study drug or its excipients;
16. Any condition considered by the investigator to be present that could harm the subject or cause the subject to be unable to meet or perform the requirements of the study.
