Abstract

Mycophenolate mofetil (MMF) monotherapy following liver transplantation (LT) remains controversial due to a risk of acute rejection. The aim of this study was to report the largest multicenter experience of the use a MMF monotherapy guided by therapeutic drug monitoring using pharmacoslope modeling and Bayesian estimations of the MPA inter-dose AUC (BEAUCMPA) before withdrawing calcineurin inhibitors (CNI) and to evaluate the benefit of MMF monotherapy. MMF daily doses were adjusted to reach the BEAUCMPA target of 45μg.h/mL. Then CNI were withdrawn and patients were followed on liver test and clinical outcomes. From 2000-2014, in 2 transplantation centers, 94 liver transplant recipients received MMF monotherapy 6.5±4 years after LT. The mean BEAUCMPA was 45.5±16μg.h/mL. During follow-up, 4 patients experienced acute rejection (4%). During the first year, estimated glomerular filtration rate (eGFR) improved from 46.2±10.5 to 49.1±11.5mL/kg/min (P=0.025). Benefit persisted at year 5. In patients with metabolic syndrome, eGFR did not improve. MMF monotherapy regimen appears usually safe and beneficial, with low risk of acute rejection and eGFR improvement. Therapeutic drug monitoring strategy seemed useful by identifying 14% of patients with low MMF exposure.

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