Testing Nivolumab and BMS-986016 (Relatlimab) as Potentially Targeting Treatment in Cancers That Are LAG-3+ and Have Mismatch Repair Deficiency (MATCH - Subprotocol Z1M)

This phase II MATCH treatment trial tests how well nivolumab and BMS-986016 (relatlimab) works in treating patients with cancer that has certain genetic changes called LAG-3 mutations with mismatch repair deficiency. A monoclonal antibody is a type of protein that can bind to certain targets in the body, such as molecules that cause the body to make an immune response (antigens). Immunotherapy with monoclonal antibodies, such as nivolumab and BMS-986016 (relatlimab), may help the body\'s immune system attack the cancer, and may interfere with the ability of cancer cells to grow and spread.