This is a randomized, open-label study designed to evaluate the safety and efficacy of neoadjuvant PD-1 antibody plus chemotherapy followed by surgery in resectable stage IIIA non-small cell lung cancer.

The primary endpoint: pCR rate The second endpoint: MPR, DFS, MRD

This study is a prospective, multicenter, phase III randomized controlled clinical study. Stage IIIA NSCLC patients with EGFR mutation negative and ALK rearrangement negative were enrolled, and after 2 courses of treatment with Sintilimab combined with Platinum-based Chemotherapy, they were randomly assigned 1:1 to the control group (surgical resection and postoperative treatment for 2 courses are recommended) or the experimental group (surgery after 2 courses of treatment).

The primary endpoint is pCR rate. The second endpoints are MPR, DFS, and MRD.

Inclusion Criteria:

1. Resectable stage IIIA NSCLC, EGFR mutation-negative and ALK rearrangement negative (8th UICC TNM staging);

2. No prior anti-tumor therapy for NSCLC;

3. Age from 18 to 75 years old;

4. Adequate organ function:

   Hemoglobin ≥9.0g/L; White blood cell count 4.0~10×109/L; The absolute value of neutrophils (ANC) ≥ 1.5×109/L; Platelet count ≥100×109/L; Total bilirubin ≤ 1.5 times the upper limit of normal; ALT and AST≤2.5 times the upper limit of normal; The international normalized ratio of prothrombin time is ≤1.5 times the upper limit of normal value, and the partial thromboplastin time is within the range of normal value; Creatinine ≤ 1.5 times the upper limit of normal;

5. No chemotherapy, radiotherapy or hormone therapy for malignant tumors, no history of other malignant tumors, excluding patients who have received hormone therapy for prostate cancer and have had DFS for more than 5 years;

6. ECOG 0～1;

Exclusion Criteria:

1. Double primary or multiple primary NSCLC;
2. EGFR mutation or ALK mutation was positive
3. patients with psychosis;
4. Pre-existing or coexisting bleeding disorders;
5. Other uncontrollable and inoperable patients;
6. Patients whose previous operations have prevented this operation from being performed;
7. Female patients who are pregnant or breastfeeding;
8. For patients who are allergic to the drugs in the program.