THPO and aplastic anemia: 评价艾曲泊帕、重组人血小板生成素(Recombinant human thrombopoietin, rhTPO)联合标准免疫抑制治疗(Immunosuppressive therapy, IST)对重型再生障碍性贫血(Severe aplastic anemia, SAA)的疗效及安全性。