Abbreviations: WBC, white blood cell; CNS, central nervous system; NA, not applicable; HSCT, hematopoietic stem cell transplantation; CR1, achieved complete remission after induction chemotherapy before HSCT; CR2, relapsed before HSCT and achieved complete remission after reinduction chemotherapy; MRD, matched related donor; MUD, matched unrelated donor; mmUD, mismatched unrelated donor; mmRD, mismatched related donor; TBI/Cy, total body irradiation/cytoxan; TBI/Flu/Cy, total body irradiation/fludarabine/cytoxan; NED, no evidence of disease; TRM, transplant-related mortality; DOD, died of disease.