The benefit of exchanging donor kidneys among transplant centers

Area of Science:

• Nephrology
• Immunology
• Transplantation Science

Background:

• The exchange of cadaver donor kidneys among transplant centers is a debated practice.
• Cyclosporine-based immunosuppression is standard for renal transplant recipients.

Purpose of the Study:

• To analyze the impact of human leukocyte antigen (HLA)-B and HLA-DR matching on kidney graft survival.
• To compare outcomes between locally transplanted and exchanged donor kidneys.

Main Methods:

• Analysis of 9369 recipients of locally transplanted kidneys and 5553 recipients of exchanged kidneys.
• Statistical evaluation of HLA matching (HLA-B, HLA-DR) and graft survival rates.
• Comparison of outcomes based on the number of HLA mismatches and cold ischemia time.

Main Results:

• Significant association between HLA matching and graft survival in both local and exchanged kidney groups (P < 0.0001).
• Exchanged kidneys with better HLA matching demonstrated superior survival compared to poorly matched local kidneys.
• One-year graft survival was 13% higher for first-time recipients with zero mismatches in exchanged kidneys versus four mismatches in local kidneys (P < 0.0001).
• Survival rates were 21% higher for second transplants with well-matched exchanged kidneys (P < 0.001).
• Kidney preservation up to 48 hours did not significantly impact graft survival.
• Well-matched exchanged kidneys with longer cold ischemia (up to 48 hours) outperformed poorly matched local kidneys with shorter cold ischemia (<24 hours) (P < 0.0001).

Conclusions:

• The exchange of cadaver kidneys among transplant centers can enhance graft survival.
• Prioritizing HLA matching through kidney exchange programs is crucial for improving renal transplantation success rates.