Abstract
Unrelated umbilical cord blood transplantation (UCBT) exhibits a low risk of graft-versus-hostdisease (GvHD) and has unique potent anti-virus and anti-leukemia effects. Anti-thymocyte globulin (ATG) in the conditioning regimen for UCBT is successful in reducing graft rejection and GvHD. Nevertheless, this beneficial effect of ATG coincides with its detrimental effect on
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