Chemotherapy, radiotherapy and interventional therapy are feasible for small cell lung cancer in middle and late stages. 1. Chemotherapy: small cell lung cancer is very sensitive to chemotherapy, and commonly used chemotherapy drugs include etoposide, cisplatin, carboplatin, etc. Chemotherapy can reduce the tumor foci and tumor load, which can help prolong the survival period of patients. 2. Radiotherapy: small cell lung cancer is also sensitive to radiotherapy, which is often used in conjunction with chemotherapy for the treatment of patients with small cell lung cancer in middle and advanced stages. After chemotherapy, some patients with small cell lung cancer in middle and advanced stages can obtain complete remission after radiotherapy, and the addition of thoracic radiotherapy and prophylactic cerebral radiotherapy can reduce the rate of local recurrence and brain metastasis, as well as reduce the risk of death. 3. Interventional therapy: for advanced patients who have lost surgical indications and are ineffective in radiotherapy, bronchial artery perfusion chemotherapy and transbronchoscopic interventional therapy can be used, which can help to alleviate the symptoms of patients and reduce their pain. Patients with small cell lung cancer in the middle or late stage should go to the hospital in time and standardize the treatment in order to prolong the survival time of patients.