Diabetes mellitus, a frequent metabolic complication in liver transplant recipients, may be produced by the diabetogenic effect of calcineurin inhibitors cyclosporine and tacrolimus. The aim of this study was to investigate the safety and metabolic effects of a gradual switch from cyclosporine or tacrolimus to mycophenolate mofetil among 12 diabetic liver transplant recipients. One patient was withdrawn from the study due to gastrointestinal side effects. Of the 11 remaining patients, cyclosporine or tacrolimus was completely withdrawn in five patients. Two patients developed suspected acute rejection episodes that were controlled by increasing the tacrolimus dosage. Glycosylated hemoglobin A1C and C-peptide levels were significantly lower at 3 and 6 months after the initiation of mycophenolate mofetil (P < .03 in all cases). Furthermore, urea and uric acid levels were significantly reduced after the change of treatment. In conclusion, a switch from cyclosporine/tacrolimus to mycophenolate mofetil may produce beneficial metabolic effects in diabetic liver transplant recipients, but poses a risk of graft rejection.
I D ABETES MELLITUS (DM) is a frequent metabolic complication in liver transplant(LT) recipients. Despite the lack of universal agreement, some studies have observed worsened short-and mid-term survival among diabetic LT recipients. 1-7 Furthermore, DM is a wellknown risk factor for cardiovascular disease, which is one of the leading causes of death of LT recipients in the long term. 8 Calcineurin inhibitors (CI) also predispose to DM through islet cell toxicity, diminished insulin synthesis or release, as well as decreased peripheral insulin sensitivity. 9 Mycophenolate mofetil (MMF) has proven to be useful as a CI-sparing agent. The use of MMF has allowed physicians to reduce cyclosporine exposure in LT recipients with renal functional impairment. 10 Some patients have been maintained on MMF monotherapy, but this strategy poses the risk of graft rejection. 11 The aim of the present study was to examine whether conversion to MMF for stable LT recipients with DM allows the reduction/withdrawal of CI and results in improve metabolic control.From the Liver Unit (J.I.H., J.Q., B.S., J.P.) and