Used for the treatment of French American British(FAB) myelodysplastic syndrome subtypes: Refractory anemia(RA) or Refractory anemia with ringed sideroblasts(if accompanied by neutropenia or thrombocytopenia or requiring transfusions), Refractory anemia with excess blasts(RAEB), Refractory anemia with excess blasts in transformation(RAEB-T)