Comparison of sirolimus alone with sirolimus plus tacrolimus in type 1 diabetic recipients of cultured islet cell grafts

Transplantation
P GillardB Keymeulen

Abstract

One year survival of islet cell grafts has been reproducibly achieved under combination immune therapy including tacrolimus (TAC). However, the use of TAC causes beta-cell and renal toxicity. Because sirolimus (SIR) monotherapy was successful in kidney transplantation under antithymocyte globulin (ATG), we undertook a pilot study comparing SIR monotherapy with SIR-TAC combination therapy. Nonuremic type 1 diabetics received a cultured beta-cell graft under ATG and were randomly assigned to SIR or SIR-TAC-maintenance therapy; a second graft was implanted during posttransplantation month 3 without ATG. The planned number of patients per group (n=10) was reduced to five in view of the observed side effects. At posttransplant month 6, three SIR-patients had lost graft function and two presented marginal function; among SIR-TAC-patients, there were two early graft failures but three became insulin-independent. These three patients maintained metabolically relevant function (C-peptide >1 ng/ml and coefficient of variation fasting glycemia <25%) for more than 2 years but low-dose insulin therapy was needed from 8, 18, and 26 months posttransplant; this was still the case in two of them after reducing and stopping TAC dose. In both gro...Continue Reading

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