 Patients have a type of blood cell cancer or other blood problem that is very hard to cure with standard treatments and she will receive a bone marrow transplant. If the patient does not have a brother or sister whose marrow is a perfect match, this bone marrow will come from a donor whose marrow is the best match available. This person may be a close relative or an unrelated person whose bone marrow best matches the patients, and who agrees to donate marrow. 