The OPTN/UNOS renal transplant registry

Area of Science:

• Nephrology
• Transplantation Immunology
• Public Health

Background:

• Kidney transplantation is a vital treatment for end-stage renal disease.
• Graft survival rates vary significantly based on donor type and recipient factors.
• Optimizing donor selection and transplant protocols is crucial for improving patient outcomes.

Purpose of the Study:

• To analyze graft survival rates for kidney transplants using living donors (LD) versus deceased donors (DD), including standard criteria donors (SCD) and expanded criteria donors (ECD).
• To evaluate the impact of donor type, recipient age, and sensitization on long-term graft survival.
• To assess the effectiveness of crossmatch testing methods and cold ischemia time on transplant outcomes.

Main Methods:

• Analysis of 66,843 kidney-only transplants from the OPTN/UNOS Renal Transplant Registry (1999-2003).
• Calculation of 5- and 10-year graft survival rates and graft half-lives for LD, SCD, and ECD kidneys.
• Comparison of outcomes based on recipient age, donor criteria, and patient sensitization levels.
• Evaluation of crossmatch techniques (flow cytometry, AHG) and cold ischemia time effects.

Main Results:

• Five-year graft survival: 80.5% (LD), 68.8% (SCD), 51.8% (ECD).
• Projected 10-year graft survival: 67.0% (LD), 50.9% (SCD), 32.9% (ECD).
• ECD kidneys were preferentially given to older recipients (median age 58).
• Older recipients (71-75+) of DD kidneys had lower 5-year survival (48.9%, 40.7%), with death-with-function being a major loss factor.
• Living donor kidney recipients over 70 had >70% graft survival.
• Broadly sensitized patients received 13% of DD and 5% of LD kidneys.
• Improved crossmatch methods reduced early rejections.
• Reduced cold ischemia time did not significantly decrease delayed graft function for SCD/ECD kidneys.

Conclusions:

• Living donor kidney transplants demonstrate superior long-term graft survival compared to deceased donor transplants.
• Expanded criteria donor kidneys, while utilized, are associated with lower graft survival rates.
• Recipient age and death with a functioning graft are significant factors affecting long-term outcomes, particularly in older recipients.
• Advanced crossmatch techniques improve early graft outcomes, but cold ischemia time reduction needs further optimization for specific donor types.