Multiracial patients often have an incredibly hard time finding life-saving marrow matches

Compared to organ transplants, bone marrow donations need to be even more genetically similar to their recipients. Though there are exceptions, the vast majority of successful matches take place between donors and patients of the same ethnic background. Since all the immune system's cells come from bone marrow, a transplant essentially introduces a new immune system to a person. Without genetic similarity between the donor and the patient, the new white blood cells will attack the host body. In an organ transplant, the body can reject the organ, but with marrow, the new immune system can reject the whole body. Even within one's own family, the chances of finding one are only about 30%. According to the World Donor Marrow Association, while two out of three Caucasians find a match, the chances of a patient from another ethnic background can be as low as one in four. For a multiracial person, the chances are usually even worse.