Immune Profile Selection By Fraction of ctDNA in Patients With Advanced NSCLC Treated With Immunotherapy

Subjects will be randomized 2:1 and patients in both arms will begin treatment with nivolumab 360 mg intravenously every 3 weeks and ipilimumab 1 mg/kg intravenously every 6 weeks. At five weeks of treatment, subjects will have ctDNA response evaluation with Guardant360 Response assay. At the next cycle of treatment (+/- 2 days), patients in the larger arm will receive treatment based on the Guardant360 Response assay results, as described below. Subjects will undergo ctDNA evaluation with Guardant360 Response assay 6- week post-randomization and at the time of progression. Response to therapy will be assessed by interval imaging with CT scan of the chest/abdomen/pelvis (and MRI brain if applicable) with response evaluated by irRECIST criteria every 12 weeks until disease progression.