Risk Factors Influencing the Outcomes of Kidney Re-Transplantation

Area of Science:

• Nephrology
• Transplantation immunology
• Clinical outcomes research

Background:

• Kidney transplant waitlists commonly include re-transplantations (TX2), comprising 20% of cases.
• Understanding expected outcomes for TX2 is crucial for clinical practice and patient counseling.

Purpose of the Study:

• To compare graft and patient survival between kidney re-transplantation (TX2) and first transplantation (TX1).
• To identify factors contributing to differential outcomes in TX2 versus TX1 recipients.

Main Methods:

• A retrospective comparison of 162 TX2 patients with 162 matched TX1 patients transplanted between 2000-2009.
• 10-year patient follow-up was conducted.
• Statistical analyses included multivariable Cox regression and Kaplan-Meier survival analysis.

Main Results:

• TX2 demonstrated significantly inferior graft and patient survival compared to TX1 (p<0.001 and p=0.047, respectively).
• TX2 recipients had more human leucocyte antigen (HLA) mismatches, higher panel-reactive antibodies, longer dialysis vintage, and more comorbidities.
• Graft failure due to rejection and death from infection were more frequent in TX2, with comorbidities independently increasing mortality risk.

Conclusions:

• Kidney re-transplantation is associated with poorer outcomes primarily due to immunologic factors and reduced graft quality.
• Patient mortality in TX2 is significantly driven by comorbidities and infection severity.
• Addressing patient comorbidities and optimizing immunosuppression strategies, particularly regarding rabbit-antithymocyte globulin (rATG) use, may improve re-transplantation outcomes.