Myelodysplastic syndromes (MDS), a collection of disorders in which the bone marrow does not produce enough mature cells, has received a lot of attention in recent years despite the fact that it affects only about five in 100,000 people. This is due in part to the Food & Drug Administration's approval of several new molecular entities used in its treatment, including azacitidine (Vidaza, Pharmion) in 2004 and lenalidomide (Revlimid, Celgene) in 2005. And just last month the agency approved a third drug, decitabine injection (Dacogen, MGI Pharma).