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Related Experiment Videos

Refinement of permissible HLA mismatches

S Takemoto, P I Terasaki

    Clinical Transplants
    |January 1, 1994
    PubMed
    Summary

    Identifying permissible mismatches in organ transplantation significantly improves graft survival rates. Sharing these specific kidney transplant mismatches can double the number of patients benefiting from transplants.

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    Area of Science:

    • Nephrology
    • Immunology
    • Transplantation Science

    Background:

    • Kidney transplant success is often limited by human leukocyte antigen (HLA) mismatches.
    • Historically, zero HLA mismatches were considered ideal, but this limits donor pool availability.

    Purpose of the Study:

    • To define "permissible mismatches" in kidney transplantation.
    • To evaluate the impact of permissible mismatches on long-term graft survival.
    • To assess the potential of including permissible mismatches in organ sharing protocols.

    Main Methods:

    • Analysis of long-term surviving cadaver-donor kidney transplants (pre- and post-1987) to identify permissible mismatches.
    • Validation of permissible mismatch lists using independent transplant datasets.
    • Projection of graft survival rates with and without permissible mismatches in national and local sharing scenarios.

    Main Results:

    • Permissible mismatches were identified from successful long-term transplants with multiple HLA mismatches.
    • Kidney recipients with permissible mismatches showed significantly better graft survival than those with immunogenic mismatches.
    • Including one permissible HLA-A,B,DR mismatch in cadaveric transplants projected 10-year survival equivalent to zero mismatches.
    • Sharing permissible mismatched grafts could double the number of patients benefiting from transplants nationally.
    • Local sharing of permissible mismatched grafts could improve 10-year survival from 41% to 52%.

    Conclusions:

    • A defined list of "permissible mismatches" exists and improves kidney transplant outcomes.
    • Incorporating permissible mismatches into organ allocation can significantly expand the donor pool and improve graft survival.
    • This strategy enhances the efficiency of both national and local kidney sharing programs.

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