u Surgery-based comprehensive treatment u Indications for surgery * Isolated or confined tumors * Doubling time >3 months * Well-differentiated non-small cell lung cancer, some sarcomas, and adenocarcinoma of the gastrointestinal tract can be operated on when the primary tumor is well controlled * Careful preoperative examination to exclude extensive systemic metastases * Single pulmonary metastases, surgery is appropriate * Single lung <3 metastases, surgery is possible, multiple metastases in both lungs, surgery is contraindicated * Good systemic condition, or poor systemic condition improves with short-term support u The surgical approach depends on the lesion * Small lesions can be localized or wedge resected * Partial lesions can be lobectomized * Normal lung tissue should be preserved as much as possible * When there are a small number of bilateral lesions, a median sternotomy is feasible to expose both lungs * In patients with poor cardiopulmonary function, thoracoscopic resection is possible * Three domestic metastasectomies are performed u 5 years Survival rate is about 27-41% u Control of primary lesion and complete surgical resection of the lesion u Size of metastases * <2cm, better prognosis u Pathological type of primary lesion * Adenocarcinoma has poor prognosis, small cell carcinoma lung metastases should not be operated u The longer the distance from the primary lesion, the longer the survival period