Objective:To observe the effects of all trans retinoic acid (ATRA) and LD Ara c induced therapy in high risk myelodysplastic syndrome (MDS);

• 目的 :研究高危MDS的治疗方法 ,观察小剂量阿糖胞苷(LD Ara c)和全反式维甲酸(ATRA)诱导治疗高危MDS的疗效。