Relationship between the unit-unit HLA-match and sustained donor engraftment. A comparison between the 79 patients with sustained donor engraftment and the 5 with graft failure is shown: (A) HLA-match at HLA-A, -B antigens and -DRB1 alleles and at (B) HLA-match at high-resolution 10 HLA-alleles. There was no statistical difference detected in the distributions of the 6 HLA-A, HLA-B antigen, HLA-DRB1 allele unit versus unit HLA match (2/6 vs 3/6 vs 4/6 vs 5/6 vs 6/6, P = .75), or distributions of the 10 HLA allele unit versus unit HLA match (1/10-2/10 vs 3-4/10 vs 5/10-6/10 vs 7/10-8/10 vs 9/10-10/10, P = 1.0) in the 79 patients with sustained engraftment and the 5 patients with graft failure.