Objective:To observe the therapeutic effects and side-effects of thalidomide combined with arsenious oxide and retinoic acid for the treatment of low-risk myelodysplastic syndromes(MDS).

• 目的:观察沙利度胺联合三氧化二砷和维甲酸治疗低危骨髓增生异常综合征(MDS)的疗效和不良反应。