A Phase II, Open-label, Non-randomized, Multi-center Study Evaluating the Efficacy and Safety of Nivolumab Plus Ipilimumab in Patients With Cancer of Unknown Primary Site Who Are Relapsed After or Refractory to Platinum-based Chemotherapy

To compare the efficacy of nivolumab plus ipilimumab in subjects with high vs. Intermediate/low TMB poor-prognosis CUP (non-specific subset) who are relapsed or refractory to platinum-based first-line chemotherapy.

To evaluate the efficacy of nivolumab plus ipilimumab in subjects with poor-prognosis CUP (non-specific subset) who are relapsed or refractory to platinum-based first-line chemotherapy