Unlabelled: The impact of ethnic miscegenation on tacrolimus clinical pharmacokinetics and therapeutic drug monitoring. We sought to determine the influence of ethnic miscegenation on tacrolimus pharmacokinetics and trough concentrations during the first 6 months after transplantation.
Methods: Tacrolimus concentrations were measured in blood samples obtained from 22 transplant recipients during the first week of transplant, within pharmacokinetic profiles, and throughout the first 6 months post-transplant, using the Pro Tac II ELISA method. Pharmacokinetic parameters and between- and within-subject blood concentration variability were compared stratifying the total population in two distinct ethnic groups of white (W) and non-white (NW) patients, according to a stringent criterion.
Results: Between-subject variability in dose-adjusted concentrations during dosing interval varied from 38.8 to 69.5%. Compared with W patients, NW patients showed higher variability in blood tacrolimus concentrations during dosing interval (37.40 +/- 5.64 vs. 56.95 +/- 11.49, p < 0.001) and lower drug exposures (AUC: 229.4 +/- 55.5 vs. 66.9 +/- 67.1 ng x h/mL, p=0.036). The correlation coefficients (r2) between C0, C12 or Cmax and AUC were 0.83, 0.91 and 0.5, respectively. An equation derived from early time concentrations (C0, C1.5 and C4) accounted for 94% of the variability observed in AUC. Compared with W patients, a higher proportion of tacrolimus blood determinations during the first week were below 10 nug/mL in NW patients (24% vs. 62%, p=0.028). Tacrolimus absorption increased from week 1-4 (1.1 +/- 0.53 vs. 1.73 +/- 0.97 nug/mL/mg, p < 0.0001) but was still showed high between- (41.6-70.4%) and within-subject (18.2-32.5%) variability, regardless of ethnicity, after stabilization.
Conclusion: Non-white patients show higher tacrolimus variability and lower drug exposures after transplantation compared with W patients. Therefore, higher initial tacrolimus doses and intensive monitoring are recommended when administering tacrolimus-based immunosupressive therapy to NW patients of this transplant population.
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