Every year, approximately 18,000 patients are diagnosed with life-threatening blood cancers or other diseases like sickle cell for which a blood stem cell transplant from a related or unrelated donor may be their best or only hope of a cure. A patient is hoping someone like you registers to become a marrow donor. A bone marrow transplant or umbilical cord blood transplant (also called a BMT) is a potentially life-saving treatment for some patients who have leukemia, lymphoma, or a genetic metabolic or immune system disorder. A bone marrow or cord blood transplant replaces a patient's unhealthy blood-forming cells with healthy cells from a donor. You could be the one to save a life.