Study Evaluating Tarlatamab in Chinese Participants With Advanced Small Cell Lung Cancer After Two or More Prior Lines of Treatment

Inclusion Criteria: * Participant has provided informed consent prior to initiation of any study specific activities/procedures. * Participant must be a resident in China, and of Chinese ancestry ≥ 18 years of age (or legal adult age within country) at the time of signing the informed consent. * Histologically or cytologically confirmed small cell lung cancer. * Extensive-stage SCLC participants who progressed on or recurred following 1 platinum-based regimen as 1L therapy (including a PD-1/PD-\[L\]1) and at least 1 other prior line of therapy. * Measurable lesions as defined per RECIST 1.1 within 21 days prior to the first dose of study drug. * Eastern Cooperative Oncology Group (ECOG) performance status of 0 to 1. * Minimum life expectancy of 12 weeks. * Adequate organ function. Exclusion Criteria: Disease Related * Any previous diagnosis of transformed non-small cell lung cancer (NSCLC), epidermal growth factor receptor (EGFR) activating mutation positive NSCLC that has transformed to SCLC. * Symptomatic central nervous system (CNS) metastases. * Diagnosis or evidence of leptomeningeal disease. * Prior history of severe or life-threatening events from any immune-mediated therapy. Other Medical Conditions * Active autoimmune disease that has required systemic treatment (except replacement therapy) within the past 2 years or any other diseases requiring immunosuppressive therapy while on study. * History of solid organ transplantation. * Evidence of interstitial lung d…