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CLINICAL TRIAL
CLINICAL TRIAL, PHASE I
CLINICAL TRIAL, PHASE II
JOURNAL ARTICLE
Pharmacokinetics of intravenous mycophenolate mofetil after allogeneic blood stem cell transplantation.
Clinical Transplantation 2001 June
BACKGROUND: Mycophenolate mofetil (MMF) has shown synergistic effects in combination with cyclosporin A (CsA) in prevention of acute graft versus host disease (GvHD) after allogeneic blood stem cell transplantation (BSCT) in preclinical animal models. After having measured low plasma levels of the active metabolite mycophenolic acid (MPA) in recipients of allogeneic blood stem cell transplants after oral administration of MMF, we initiated a phase I/II study evaluating different dose levels of the intravenous (i.v.) formulation together with standard dose CsA.
METHODS: A total of 15 patients received i.v. MMF in two split doses for 21 d after allogeneic BSCT from related (n=9) and unrelated (n=6) donors. Total daily doses of 25, 28, 31 and 34 mg/kg were investigated in 3-5 patients at each dose level. Plasma concentrations of MPA and its metabolite mycophenolic acid glucuronide (MPAG) were measured by high-performance liquid chromatography (HPLC).
RESULTS: Mean trough blood levels of MPA ranged between 68.8 and 340 ng/mL with a median of 146.7 ng/mL. The mean MPA AUC0-12 h after first dose ranged between 19349+/-5087 ng * h/mL and 25705+/-3042 ng * h/mL and correlated with the dose level of MMF. The incidence of acute GvHD>grade I was 40%. No dose limiting toxicities were observed.
CONCLUSIONS: The application of i.v. MMF is safe at a weight-adjusted dose between 25 and 34 mg/kg after allogeneic BSCT. The measured trough blood levels of MPA in patients after BSCT were ten times lower than in healthy volunteers. The toxicity induced by the conditioning therapy seems to negatively influence the pharmacokinetic behavior of MMF, MPA and MPAG.
METHODS: A total of 15 patients received i.v. MMF in two split doses for 21 d after allogeneic BSCT from related (n=9) and unrelated (n=6) donors. Total daily doses of 25, 28, 31 and 34 mg/kg were investigated in 3-5 patients at each dose level. Plasma concentrations of MPA and its metabolite mycophenolic acid glucuronide (MPAG) were measured by high-performance liquid chromatography (HPLC).
RESULTS: Mean trough blood levels of MPA ranged between 68.8 and 340 ng/mL with a median of 146.7 ng/mL. The mean MPA AUC0-12 h after first dose ranged between 19349+/-5087 ng * h/mL and 25705+/-3042 ng * h/mL and correlated with the dose level of MMF. The incidence of acute GvHD>grade I was 40%. No dose limiting toxicities were observed.
CONCLUSIONS: The application of i.v. MMF is safe at a weight-adjusted dose between 25 and 34 mg/kg after allogeneic BSCT. The measured trough blood levels of MPA in patients after BSCT were ten times lower than in healthy volunteers. The toxicity induced by the conditioning therapy seems to negatively influence the pharmacokinetic behavior of MMF, MPA and MPAG.
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