A strong impact of matching for a limited number of HLA-DR antigens on graft survival and rejection episodes: a single-center study of first cadaveric kidneys to nonsensitized recipients.

BACKGROUND A single-center study of 655 nonsensitized recipients of primary cadaveric kidney grafts is presented. RESULTS Graft survival in serologically HLA-DR 1-10 antigen-matched grafts to nonsensitized recipients at 1 year was 90%, compared with 82% (P=0.004) and 73% (P=0.001) in one and two DR antigen-mismatched grafts. The corresponding figures at 5 years were 76%, 62%, and 56%, respectively. Matching for the DR antigens 11-14, or for some DR alleles only detectable by genomic typing, further improved graft survival, but the differences did not reach statistical significance. Matching also for the serologically defined HLA-A and -B antigens did not significantly further improve overall graft survival, but some effects for grafts surviving at least 1 year were observed. Among recipients of grafts mismatched for zero, one, or two HLA-DR antigens, acute rejection episodes were experienced in 48%, 64% (P<0.001), and 82% (P<0.001), respectively, within the first 3 months. HLA-A and -B mismatches showed no significant correlation to acute rejection episodes. CONCLUSION Matching for the DR antigens 1-10 significantly secures and prolongs the survival of first cadaveric renal grafts. Our results also show that DR 1-10 antigen-matched combinations can often be obtained even in rather small recipient pools, when actively sought for.

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