primary purpose：Observe the pathological complete response rate (PCR) of postoperative tumor tissue resection and evaluate the safety of the treatment process.~Description of the study design This is a single-center, prospective, open-label, single-arm clinical study to preliminarily explore the single-arm clinical study administration and drug management of Sintilimab, anlotinib combined with neoadjuvant chemotherapy in stage IIA-IIIB NSCLC~Dosing regimen Sintilimab (200mg fixed dose) iv, d1, q3w + anlotinib 10mg, po, qd1-14, q3w, was evaluated after 3 cycles of chemotherapy and stopped for 3 weeks (21 days) after surgery for 4-6 weeks (21-42 days) after the last dose.
primary purpose：Observe the pathological complete response rate (PCR) of postoperative tumor tissue resection and evaluate the safety of the treatment process.