Faculty Collaboration Database

Classification of HLA-matching for retrospective analysis of unrelated donor transplantation: revised definitions to predict survival. Biol Blood Marrow Transplant 2008 Jul;14(7):748-58

Date

06/11/2008

Pubmed ID

18541193

Pubmed Central ID

PMC2668157

DOI

10.1016/j.bbmt.2008.04.003

Scopus ID

2-s2.0-44649167561 (requires institutional sign-in at Scopus site)   182 Citations

Abstract

The best unrelated donors (URD) for hematopoietic cell transplantation (HCT) are alleles matched at HLA-A, -B, -C, and DRB1. Earlier studies mostly used incomplete or lower resolution HLA typing for analysis of transplant outcome. To understand the impact of incomplete HLA characterization, we analyzed 14,797 URD HCT (1995-2006) using multivariable regression modeling adjusting for factors affecting survival. Of 21 matching cohorts, we identified 3 groups with significantly different outcomes. Well-matched cases had either no identified HLA mismatch and informative data at 4 loci or allele matching at HLA-A, -B, and -DRB1 (n = 7477, 50% of the population). Partially matched pairs had a defined, single-locus mismatch and/or missing HLA data (n = 4962, 34%). Mismatched cases had > or =2 allele or antigen mismatches (n = 2358, 16%). Multivariate adjusted 5-year survival estimates were: well-matched: 54.1 (95% confidence interval), 52.9-55.4), partially matched: 43.7 (42.3-45.2), and mismatched: 33.4 (32.5-36.5), P < .001. A better matched donor yielded 10%-11% better 5-year survival. Importantly, intermediate resolution -A, -B, and -DRB1 alleles matched "6/6 antigen matched" HCT had survival outcomes within the partially matched cohort. We suggest that these proposed HLA subgroupings be used when complete HLA typing is not available. This improved categorization of HLA matching status allows adjustment for donor-recipient HLA compatibility, and can standardize interpretations of prior URD HCT experience.

Author List

Weisdorf D, Spellman S, Haagenson M, Horowitz M, Lee S, Anasetti C, Setterholm M, Drexler R, Maiers M, King R, Confer D, Klein J

Author

Mary M. Horowitz MD, MS Professor in the Medicine department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Adolescent
Adult
Database Management Systems
Disease-Free Survival
Female
HLA Antigens
Hematopoietic Stem Cell Transplantation
Histocompatibility
Histocompatibility Testing
Humans
Male
Middle Aged
Retrospective Studies
Tissue Banks
Transplantation, Homologous