Description: People who have had one of the bone marrow failures syndromes listed below are asked to participate in a research study. If you are at least 18 and have one of the following, you may qualify: Aplastic Anemia (pancytopenia with a hypocellular marrow and no evidence of leukemia), Myelodysplastic Syndromes, Refractory Anemia, Refractory Cytopenia with Multilineage Dysplasia, 5q-Syndrome, or other bone marrow failure syndromes.