UNRELATED DONOR BONE-MARROW TRANSPLANTATION - INFLUENCE OF HLA-A AND HLA-B INCOMPATIBILITY ON OUTCOME

We have studied the outcome of 211 consecutive unrelated donor (URD) b one marrow transplants (BMT) performed at the University of Minnesota (Minneapolis, MN) between May 1985 and December 1992. Ninety patients (43%) received marrow matched serologically at HLA A, B, and DR loci; 86 (41%) received marrow with a major and 32 (15%) marrow with a minor serologic mismatch at the HLA A or B locus. Multivariate analysis rev ealed that older age had an adverse effect on survival. in younger (ag e less than 18 years) recipients, survival after fully matched (A, B, and DR subtype) or major mismatched (A or B locus), DR subtype-matched donor BMT was not significantly different (P = .4; survival: 53% v 41 %, respectively, at 3 years). For adults, survival after matched donor BMT was significantly better than that with mismatched donors (P <.01 ; survival: 30% v 10%, respectively, at 3 years). Formal quality of li fe assessment by telephone interview demonstrated similar functional s tatus in survivors of URD and related donor (RD) BMT at least 2 years post-BMT. URD BMT provides effective therapy for a variety of lethal h ematopoietic diseases that rivals outcome of RD transplant in some cas es. Use of URD marrow with a major mismatch at one HLA A or B locus is well tolerated in young, but not in older, recipients, These observat ions should be used to improve donor selection and counseling for URD BMT candidates. (C) 1995 by The American Society of Hematology.