Rituximab and Hyaluronidase Human in Patients With Advanced Melanoma Undergoing Nivolumab and Ipilimumab Therapy

PRIMARY OBJECTIVE: I. To compare rates for grade 3-4 immune-related adverse event (IRAE)s in the first 6 months in patients treated with combination checkpoint blockade (CCB) therapy (anti-CTLA4 and anti-PD1) as a part of standard of care for advanced melanoma who are treated with a single course of 4 weekly doses of rituximab and hyaluronidase human (Rituxan) therapy versus those who are not treated with Rituxan. SECONDARY OBJECTIVES: I. To evaluate the safety and tolerability (in terms of Rituxan-related adverse events) in patients with melanoma receiving CCB. II. To compare objective response rate in patients receiving CCB therapy + Rituxan versus CCB therapy alone. III. To compare 1 year overall and progression-free survival in patients receiving CCB therapy + Rituxan versus CCB therapy alone. IV. To compare changes in cluster of differentiation 21lo (CD21lo) B cells in patients receiving CCB therapy + Rituxan versus CCB therapy alone. V. To compare changes in T cells in patients receiving CCB therapy + Rituxan versus CCB therapy alone. OUTLINE: Participants are randomized to 1 of 2 arms. ARM A: Participants receive standard of care ipilimumab and nivolumab therapy. ARM B: Participants receive standard of care ipilimumab and nivolumab therapy. On day 2 of each cycle, participants also receive rituximab and hyaluronidase human intravenously (IV) or subcutaneously (SC) weekly starting week 1 for 4 doses in the absence of disease progression or unacceptable toxicity. After completion of study treatment, participants are followed up for 4 weeks.