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  • Title: Limited-sampling strategy for mycophenolic acid in renal transplant recipients reciving enteric-coated mycophenolate sodium and tacrolimus.
    Author: Sánchez Fructuoso AI, Perez-Flores I, Calvo N, Valero R, Matilla E, Ortega D, Del Dedo MA, Fernández-Pérez C, Barrientos A.
    Journal: Ther Drug Monit; 2012 Jun; 34(3):298-305. PubMed ID: 22549501.
    Abstract:
    BACKGROUND: Substantial research has been conducted to develop limited-sampling strategies (LSS) to estimate the area under the curve (AUC(0-12h)) in patients treated with mycophenolate mofetil. However, no LSS has been validated for enteric-coated mycophenolate sodium (EC-MPS). Our aim was to develop an LSS to measure the AUC(0-12h) of mycophenolic acid in kidney recipients treated with tacrolimus and EC-MPS. STUDY DESIGN: Thirteen serial blood samples were collected over 12 hours from 71 patients treated with tacrolimus and EC-MPS. Mycophenolic acid was measured in plasma using the enzyme-multiplied immunoassay. LSSs were developed and validated by multiple regression analysis using a 2-group method (test, n = 47; validation, n = 24). RESULTS: The best LSS obtained in the test group were for 3 and 4 time points AUC(0-12h) (mg·h(-1)·L(-1)) = 15.99 + 0.87C1 h + 0.68C2 h + 7.85C4 h and AUC(0-12h) (mg·h(-1)·L(-1)) =11.15 + 0.68C1 h + 0.45C1.5 h + 0.57C2 h + 8.16C4 h, respectively. When these LSS were tested in the validation group, the results were acceptable (adjusted r(2) = 0.71, bias =-0.214 [95% confidence interval (CI): -7.91 to 7.48], precision = 7.48 (95% CI: 3.69-19.39) for 3 time points and adjusted r(2) = 0.76, bias = -1.48 (95% CI: -8.23 to 5.27), precision = 7.68 (95% CI: 4.23-13.50) for 4 time points). CONCLUSIONS: : An LSS using time points at C(1h)-C(2h)-C(4h) or C(1h)-C(1.5h)-C(2h)-C(4h) provides the most reliable and accurate estimation of the AUC(0-12h) of mycophenolic acid in stable renal transplant recipients treated with EC-MPS and tacrolimus.
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