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• W2789689655 abstract "Aims Statistically significant positive correlations are reported for the abundance of hepatic drug‐metabolizing enzymes. We investigate, as an example, the impact of CYP3A4–CYP2C8 intercorrelation on the predicted interindividual variabilities of clearance and drug–drug interactions (DDIs) for repaglinide using physiologically based pharmacokinetic (PBPK) modelling. Methods PBPK modelling and simulation were employed using Simcyp Simulator (v15.1). Virtual populations were generated assuming intercorrelations between hepatic CYP3A4–CYP2C8 abundances derived from observed values in 24 human livers. A repaglinide PBPK model was used to predict PK parameters in the presence and absence of gemfibrozil in virtual populations, and the results were compared with a clinical DDI study. Results Coefficient of variation (CV) of oral clearance was 52.5% in the absence of intercorrelation between CYP3A4–CYP2C8 abundances, which increased to 54.2% when incorporating intercorrelation. In contrast, CV for predicted DDI (as measured by AUC ratio before and after inhibition) was reduced from 46.0% in the absence of intercorrelation between enzymes to 43.8% when incorporating intercorrelation: these CVs were associated with 5th/95th percentiles (2.48–11.29 vs. 2.49–9.69). The range of predicted DDI was larger in the absence of intercorrelation (1.55–77.06) than when incorporating intercorrelation (1.79–25.15), which was closer to clinical observations (2.6–12). Conclusions The present study demonstrates via a systematic investigation that population‐based PBPK modelling incorporating intercorrelation led to more consistent estimation of extreme values than those observed in interindividual variabilities of clearance and DDI. As the intercorrelations more realistically reflect enzyme abundances, virtual population studies involving PBPK and DDI should avoid using Monte Carlo assignment of enzyme abundance." @default.
• W2789689655 created "2018-03-29" @default.
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• W2789689655 date "2018-03-06" @default.
• W2789689655 modified "2023-10-12" @default.
• W2789689655 title "Implications of intercorrelation between hepatic CYP3A4-CYP2C8 enzymes for the evaluation of drug-drug interactions: a case study with repaglinide" @default.
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• W2789689655 doi "https://doi.org/10.1111/bcp.13533" @default.
• W2789689655 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5903242" @default.
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• W2789689655 hasPublicationYear "2018" @default.
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