RecruitingEarly Phase 1Biological interventionLow-Dose Interleukin-2 and Pembrolizumab for the Treatment of Stage IV Non-Small Cell Lung CancerThis early phase 1 trial will investigate the combination of low-dose interleukin-2 (IL-2) and pembrolizumab in patients with previously untreated stage IV non-small cell lung cancer (NSCLC). Preclinical data demonstrate reinvigoration of exhausted T cells into an effector-like phenotype with improved anti-tumor activity in response to this combination. This study will evaluate T cell function as well as clinical outcomes associated with this combination therapy.