This phase Ib trial studies the side effects of nivolumab and to see how well it works in treating patients with autoimmune disorders and cancer that has spread to other places in the body or cannot removed by surgery. Immunotherapy with monoclonal antibodies, such as nivolumab, may help the body's immune system attack the cancer, and may interfere with the ability of tumor cells to grow and spread. Are you Eligible? (Inclusion Criteria) Are you 18 years of age or older? Do you have an autoimmune disease such as rheumatoid arthritis, lupus, multiple sclerosis, or inflammatory bowel disease?...