[Myelodysplastic syndrome].

Myelodysplastic syndrome (MDS) is a heterogenous syndrome which has features of refractory anemia and preleukemic state due to the ineffective hematopoiesis of bone marrow cells. MDS is classified by the FAB classification and/or WHO classification, and has an International Prognostic Scoring System (IPSS) for evaluation of the prognosis. Available therapies consist of a variety of modalities from supportive therapy to hematopoietic stem cell transplantation, and are selected according to the condition of each patient.