BACKGROUND: The once-daily (QD), prolonged-release formulation of tacrolimus has been shown to improve adherence versus twice-daily (BD) tacrolimus. Treatment nonadherence in transplant recipients has been associated with poor graft outcomes. METHODS: This open-label, parallel-group study randomized adults with end-stage renal disease undergoing primary kidney transplantation or retransplantation to an initial dose of tacrolimus BD 0.2 mg/kg per day (Arm 1; n=309), QD 0.2 mg/kg per day (Arm 2; n=302), QD 0.3 mg/kg per day (Arm 3; n=304) all with mycophenolate mofetil and corticosteroids (tapered) over 24 weeks, or tacrolimus QD 0.2 mg/kg per day with mycophenolate mofetil, basiliximab, and corticosteroids given only perioperatively (Arm 4; n=283). The primary composite endpoint (efficacy failure; per protocol set) was defined as graft loss, biopsy-confirmed acute rejection, or graft dysfunction at week 24. Graft dysfunction was defined as estimated glomerular filtration rate Modification of Diet in Renal Disease-4 formula of less than 40 mL/min/1.73 m(2). The prespecified noninferiority margin was 12.5%. RESULTS: The per protocol set included 976 patients: 237, 263, 246, and 230 patients in Arms 1 to 4, respectively. Noninferiority of the composite endpoint was demonstrated for Arm 2 versus Arm 1; Kaplan-Meier estimates of efficacy failure were 42.2% and 40.6%, respectively (difference, -1.6%; 95% confidence interval [CI], -12.2% to 9.0%). Noninferiority to Arm 1 was not confirmed for Arm 3 (difference, -3.5%; 95% CI, -13.6% to 6.6%) or Arm 4 (difference, -7.1%; 95% CI, -16.1% to 1.9%). Graft dysfunction (estimated glomerular filtration rate <40 mL/min/1.73 m(2)) was the main determinant of composite-endpoint efficacy failure across all arms. CONCLUSIONS: In patients representative of the European kidney transplant population, tacrolimus QD-based immunosuppression (0.2 mg/kg/day), without induction, showed similar efficacy to 0.2 mg/kg per day tacrolimus BD.

Department of Nephrology Centre Hospitalier Universitaire de Nice Nice France 2 Internal Medicine 2 Nephrology University Medical Center Regensburg Germany 3 General Visceral and Transplantation Surgery Hannover Medical School Hannover Germany 4 Department of Transplantology and Surgery District Public Hospital Poznan Poland 5 Department of Nephrology Institute for Clinical and Experimental Medicine Prague Czech Republic 6 Department of Nephrology Dialysis and Organ Transplantation Toulouse University Hospital Toulouse France 7 Address correspondence to Nassim Kamar M D Department of Nephrology Dialysis and Organ Transplantation Toulouse University Hospital CHU Rangueil TSA 50032 31059 Toulouse Cedex 9 France

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Transplantation. 2014 Mar 27;97(6):38 PubMed

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