总结：对那些缺乏合适同胞供体且需要异基因移植的髓系恶性血液病患者，脐带血是移植所用造血干细胞的有效替代来源。

• SUMMARY: Umbilical cord blood is a aluable alternatie source of hematopoietic stem cells for transplantation of patients with myeloid malignancies who need an allogeneic transplant, but lack a suitable sibling donor.