The study drug, 5-azacytidine, is given daily intravenously for 7 days. After every 2 cycles study participants will have a bone marrow test to evaluate the effect of the 5-azacytidine on the Myelodysplastic Syndrome (MDS). Participants continue to get cycles of 5-Azacytidine until 2 bone marrow tests show the MDS has stopped responding to the treatment. At that time they will undergo a transplant if a donor is available.