Myelodysplastic syndromes are refered to as a group of diseases characterized by abnormal clonal proliferation of hematopoietic stem cells with pancytopenia and dysplasia.

• 摘要骨髓增生异常综合徵是以造血干细胞的异常克隆性增生、血细胞减少、骨髓出现病态造血为特徵的一类疾病。