Radical RADiotherapy and Immunotherapy for Metastatic CAncer of the Lung (RRADICAL)

PRIMARY OBJECTIVES: I. Determine if progression-free survival at 24 weeks with this treatment combination is improved compared to historical controls who received immunotherapy without radiation therapy. SECONDARY OBJECTIVES: I. Assess acute (0-6 months) and late (\> 6 months) grade 3-5 toxicity. II. Assess overall survival. III. Correlate circulating tumor deoxyribonucleic acid (DNA) (ratio of post-radiation therapy \[RT\] to pre-RT level) with radiographic response. IV. Correlate immune markers in peripheral blood with radiographic response. TERTIARY OBJECTIVES: I. Analyze progression-free survival with immune-related response criteria. II. Measure time to discontinuation of study immunotherapy agent. III. Assess patterns of progression. OUTLINE: Patients are assigned to 1 of 2 arms. ARM I: Patients undergo radical-dose image guided radiation therapy daily for up to 10 days (within 2 weeks) while undergoing standard of care immunotherapy. Arm II: Patients who decline to undergo radiation therapy receive standard of care immunotherapy. After completion of study treatment, patients are followed up at 30 days and every 6 months thereafter.