Simpler and equitable allocation of kidneys from postmortem donors primarily based on full HLA-DR compatibility

Area of Science:

• Transplantation immunology
• Organ transplantation outcomes
• Histocompatibility

Background:

• Human leukocyte antigen (HLA)-matching enhances kidney graft outcomes but increases waiting times for rare HLA phenotypes.
• The differential impact of HLA-DR and HLA-A,B matching on kidney transplantation requires further investigation.

Purpose of the Study:

• To evaluate the distinct effects of HLA-DR matching versus HLA-A,B matching on kidney transplant outcomes.
• To determine optimal HLA matching strategies for kidney allograft allocation.

Main Methods:

• Kaplan-Meier survival analysis to estimate graft survival rates.
• Cox proportional hazard regression to assess the risk of rejection and graft loss.
• Analysis of single-center data (n=456) and a large Eurotransplant database (n=39,205).

Main Results:

• Full HLA-DR compatibility significantly improved graft survival and reduced acute rejections within 180 days post-transplant.
• Additional HLA-A,B matching benefit was observed only in fully HLA-DR compatible recipients.
• A single HLA-DR incompatibility negated the positive impact of HLA-A,B matching.

Conclusions:

• Prioritizing full HLA-DR compatibility for deceased donor kidney allocation is recommended.
• HLA-A,B matching can serve as a secondary criterion when HLA-DR is fully matched.
• This strategy benefits all patients, regardless of ethnic origin, by optimizing graft survival and reducing organ transport times.