Multivariate analysis
Cox regression was performed to further evaluate the possible risk factors for HBsAb disappearance within one year after PBSCT. The following factors were included in the analysis: patient age, patient sex, recipient pretransplant HBsAb titer, donor pretransplant HBsAb titer, the administration of ATG, the administration of corticosteroids and the presence of GVHD. Of all the variables, only recipient HBsAb titers <207.5 IU/L before transplantation and the presence of GVHD were significantly associated with HBsAb disappearance within one year after HSCT (Table 2).