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联合化疗仍是目前治疗白血病的重要手段，但化疗的最大副作用是抑制骨问，引发外周白细胞和血小板数的明显降低，可导致严重感染和出血．危及生命。因此．恢复和维持正常的外周血象对化疗的顺利完成相当重要。近年来发现脐血（C0rdBldri，CB）中含有丰富的造血干细胞卜1，脐血
Combination chemotherapy is still an important treatment of leukemia, but the biggest side effect of chemotherapy is to inhibit the bone asked, causing peripheral leukocytes and platelet count significantly reduced, can lead to serious infections and bleeding. life threatening. therefore. Recovery and maintenance of normal peripheral blood on the successful completion of chemotherapy is very important. In recent years, cord blood (C0rdBldri, CB) is found rich in hematopoietic stem cells 1, umbilical cord blood