1. Histologically or cytologically diagnosed with myelodysplastic syndromes (MDS) or chronic myelomonocytic leukemia (CMML) according to World Health Organization (WHO) Classification or French-American-British (FAB) Classification. As for patients with refractory anemia with excess of blasts in transformation (RAEB-t), however, the peripheral blood white blood cell count is ≤ 25,000 /mm3 or the state of disease was stabilized for at least 4 weeks without treatment.