Durvalumab Consolidation After Chemoradiation Therapy for Limited Stage SCLC in China

Inclusion Criteria: * Able to provide informed consent * Age ≥18 years * Histologically or cytologically documented LS-SCLC (Stage I-III SCLC \[T any, N any, M0\] according to the American Joint Committee on Cancer Staging Manual \[AJCC Cancer Staging Manual, 8th Edition\], that can be safely treated with definitive radiation doses. Excludes T3-4 due to multiple lung nodules that are too extensive or have tumor/nodal volume that is too large to be encompassed in a tolerable radiation plan) * ECOG PS 0-2 (prior to the first dose of durvalumab after CRT) * No disease progression following cCRT/sCRT (cCRT refers to chemotherapy and radiotherapy are administered with overlap; sCRT refers to chemotherapy and radiotherapy are delivered in a sequential manner with no overlap) * Patients who received platinum-based cCRT/sCRT followed by durvalumab consolidation as first-line treatment at the discretion of physicians are eligible (the time interval from the end of cCRT/sCRT to the first dose of durvalumab consolidation should be within 3 months) * Patients who started durvalumab consolidation ≤3 months before enrolment in the study will be allowed (irrespective of whether they continue to receive durvalumab at time of enrolment or already discontinued treatment) Exclusion Criteria: * Patients treated with CRT only without subsequent durvalumab consolidation * Patients received durvalumab or any other anti-PD-1/anti-PD-L1 antibodies along with CRT * Patients who previously were involved, or currently are, or plan to be involved in any other interventional anti-cancer clinical studies for LS-SCLC * Prior exposure to immune-mediated therapy including, but not limited to, other anti-PD-1, anti-PD-L1, and anti-PD-L2 antibodies, excluding therapeutic anticancer vaccines * Judgment by the investigator that the patient should not participate in the study because the patient is unlikely to comply with study procedures