骨髓增生异常综合征是一组起病缓慢、常发生于50岁以上中老年人的造血功能异常性疾病,以往称为白血病前期或“白前”,但是相当部分的病人不一定发展为典型的白血病,而是死于贫血、出血或感染,因此“白前”的名称并不十分恰当,故现改称为骨髓增生异常综合征(Myelodysplastic Syndrome,MDS)。1982年FAB协作组进一步将MDS分为五型, Myelodysplastic syndrome is a group of slow onset, often occurs in the elderly over the age of 50 hematopoietic disorders, previously known as pre-leukemia or “pre-white,” but a considerable part of the patient does not necessarily develop into a typical Leukemia, but died of anemia, bleeding or infection, so “white before” the name is not very appropriate, it is now called myelodysplastic syndrome (Myelodysplastic Syndrome, MDS). 1982 FAB collaboration group to further divide the MDS into five types,