HD IL-2 + Ipilimumab in Patients With Metastatic Melanoma

Phase IV, open-label, randomized, two-arm, multi-center study in patients with metastatic melanoma who are treatment naïve or have previously received a single non-immunologic therapy. Treatment Arm 1: "HD IL-2 first, then ipilimumab" Patients will receive two courses (four cycles) of High Dose Interleukin-2 (HD IL-2) followed by one course (four doses) of ipilimumab. Treatment Arm 2: Ipilimumab first then HD IL-2 Patients will receive one course (four doses) of ipilimumab followed by two courses (four cycles) of HD IL-2.