Methane Active Not Recruiting Phase 3 Trials for Stage IV Cutaneous Melanoma AJCC v6 and v7 / Stage IIIB Cutaneous Melanoma AJCC v7 / Metastatic Melanoma / Stage III Cutaneous Melanoma AJCC v7 / Stage IIIA Cutaneous Melanoma AJCC v7 / Stage IIIC Cutaneous Melanoma AJCC v7 / Recurrent Melanoma / Unresectable Cutaneous Melanoma Treatment