Influence of high-resolution unit-recipient HLA match on sustained donor engraftment (n = 84). The degree of HLA-matching of each unit to the recipient does not influence the likelihood of sustained donor engraftment, or the dominant unit in engrafting patients. The distribution of HLA-matching of the dominant units is shown for the 79 patients with sustained donor engraftment and the 5 recipients with graft failure; there was no difference at 6 HLA loci (P = .65) or 10 HLA alleles (P = .66) between the 2 groups of patients.