Small cell lung cancer is a tumor that is very sensitive to chemotherapy. Sensitivity means that small cell lung cancer can shrink the tumor completely or even disappear after chemotherapy, i.e. complete clinical remission. At this time, if there is no metastasis in the initial lymph nodes and the tumor lesion is relatively small, it can be removed by surgery after chemotherapy, and the 5-year survival rate after surgery is more than 30%-40%. In addition to being sensitive to chemotherapy, small cell lung cancer is mainly prone to recurrence and distant metastasis. After chemotherapy is used to reduce the stage, it is necessary to further evaluate whether there is distant metastasis. If there is distant metastasis, it is not appropriate to do surgery at this time, and only continue to adopt chemotherapy strategy. If there is no lymph node metastasis, it can be treated by surgical resection and postoperative adjuvant chemotherapy.