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Prospective, Pilot, Open‐Label, Short‐Term Study of Conversion to Leflunomide Reverses Chronic Renal Allograft Dysfunction

Leflunomide (LEF) is a synthetic isoxazole derivative with anti‐inflammatory and antiviral properties, which has been reported to prevent acute rejection and delay progression of chronic allograft nephropathy (CAN) in animal models. We performed a pilot, crossover trial in 22 renal transplant recipients who were converted from azathioprine (AZA) or mycophenolate mofetil (MMF) to LEF in an effort to slow progression of renal dysfunction [deteriorating renal function (n = 5), cyclosporine (CyA) nephrotoxicity (n = 4) or biopsy‐proven CAN (n = 13)]. Baseline maintenance immunosuppression consisted of CyA, AZA or MMF and prednisone. Six‐month postconversion patient and graft survival was 100% and 91%, respectively. Mean serum creatinine 6 months preconversion was 2.2 ± 0.6 mg/dL, at initiation was 3.0 ± 1.1 mg/dL, and 6 months postconversion was 2.8 ± 1.3 mg/dL. The rate of change in serum creatinine was 35 ± 39%/6 months preconversion and − 5 ± 21%/6 months postconversion to LEF (p = 0.003). Two patients discontinued LEF for diarrhea and myalgia. No readmissions, increase in liver function tests, infections or acute rejection episodes occurred. Mean CyA levels did not change, 146 ± 72 ng/mL pre‐LEF vs. 132 ± 51 ng/mL post‐LEF, p = NS. Conversion to LEF reversed progression of chronic renal allograft dysfunction with minimal toxicity.