 - Participants with stage IIA with class 2 DecisionDx Score through IV melanoma in cohorts defined below. These participants may have had cutaneous, uveal, mucosal primary melanoma, or an unknown primary melanoma. The diagnosis of melanoma must be confirmed by cytological or histological examination. Staging of cutaneous melanoma will be based on the revised AJCC staging system. Participants must be eligible to be treated with ipilimumab based on clinician judgment within standard of care. 