骨髓增生异常综合征(MDS)是一组获得性的、造血功能严重紊乱的、造血干细胞克隆性疾病。临床表现为不明原因的难治性慢性进行性血细胞减少,伴骨髓增生及病态造血,大部分患者三系减少,有的两系或一系减少,并且部分患者病情较稳定,表现为长期的“良性病程”,而1/3的患者在数月或 Myelodysplastic syndrome (MDS) is a group of acquired hematopoietic stem cell clonal diseases with severe hematopoietic disorders. Clinical manifestations of unexplained refractory chronic progressive cytopenia, with myeloproliferation and morbid hematopoiesis, the majority of patients with three lines decreased, and some two series or a series of decreased, and some patients with more stable disease, the performance of long-term “ Benign course ”, while 1/3 of the patients in a few months or