Anlotinib In Combination With Durvalumab As Sequential Therapy of Thoracic Radiotherapy After Induction Chemotherapy For Extensive-Stage Small Cell Lung Cancer:A Single Arm Study

Inclusion Criteria:

\- The subjects volunteered to join the study and signed the informed consent form. They had good compliance and cooperated with the follow-up; Patients between 18-75 years old; Extensive small cell lung cancer confirmed by histopathology (according to Veterans Administration lung study group, Valg stage) and did not progress after 4-6 cycles (21 days as a cycle) of first-line standard chemotherapy platinum combined with etoposide \[complete remission (CR), partial remission (PR) or stable (SD) according to recist1.1 standard\]; The time interval between the first TRT and the end of the last chemotherapy should be less than or equal to 6 weeks; The life expectancy shall be at least 3 months; ECoG score: 0-1

Exclusion Criteria:

\- Small cell lung cancer patients with other pathological types of tumor species; Patients with pathological fracture in bone metastasis of small cell lung cancer; Patients with central nervous system metastasis; Patients who have received chest radiotherapy before; Patients who have used vasotargeted drugs (such as bevacizumab, sunitinib, etc.) including enrotinib and immunosuppressive agents before; Imaging (CT or MRI) showed that the distance between the tumor focus and the large blood vessel was less than or equal to 5 mm, or there was a central tumor invading the local large blood vessel, or there was an obvious cavitary or necrotic tumor in the lung;