Ipilimumab + Nivolumab w/Thoracic Radiotherapy for Extensive-Stage Small Cell Lung Cancer

This study is a nonrandomized, phase II, single arm, multicenter trial evaluating safety and efficacy of thoracic radiation therapy followed by nivolumab and ipilimumab in participants with Extensive-Stage Disease Small Cell Lung Cancer (ED-SCLC) who have completed a first-line platinum-based chemotherapy regimen and achieved ongoing complete response (CR), partial response (PR), or stable disease (SD). This study will determine whether nivolumab and ipilimumab delivered 2 weeks following consolidative thoracic radiation therapy demonstrates acceptable toxicity and whether the treatment regimen will improve 6-month progression-free survival (PFS) compared with a similar historical control cohort in this participant population. Additional objectives include further characterization of overall survival, adverse event profile, patterns of failure analysis, and potential predictive biomarkers of response to nivolumab in combination with ipilimumab and thoracic radiation therapy in patients with ED-SCLC.