Ipilimumab or Nivolumab in Treating Patients With Relapsed Hematologic Malignancies After Donor Stem Cell Transplant

This phase I/Ib trial studies the side effects and best dose of ipilimumab or nivolumab in treating patients with cancers of the blood and blood-forming tissues (hematologic cancers) that have returned after a period of improvement (relapsed) after donor stem cell transplant. Immunotherapy with monoclonal antibodies, such as ipilimumab and nivolumab, may help the body's immune system attack the cancer, and may interfere with the ability of tumor cells to grow and spread.