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Published in: Cancer Chemotherapy and Pharmacology 2/2021

01-02-2021 | Pharmacokinetics | Original Article

Population pharmacokinetic and pharmacodynamic modeling of capecitabine and its metabolites in breast cancer patients

Authors: Nastja Lunar, Marie-Christine Etienne-Grimaldi, Pauline Macaire, Fabienne Thomas, Florence Dalenc, Jean-Marc Ferrero, Xavier Pivot, Gérard Milano, Bernard Royer, Antonin Schmitt

Published in: Cancer Chemotherapy and Pharmacology | Issue 2/2021

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Abstract

Purpose

The present study was performed to examine relationships between systemic exposure of capecitabine metabolites (5-FU, 5′-DFCR and 5′-DFUR) and toxicity or clinical response in patients with metastatic breast cancer.

Methods

A population pharmacokinetic model for capecitabine and its three metabolites was built. Typical parameter values, characteristics of random distributions, associated with parameters, and covariates impact were estimated. Area under the curve (AUC) were computed for 5-FU and compared with grades of toxicity. Pharmacokinetic modeling was based on data collected on the first treatment cycle. Toxicity was assessed on the two first treatment cycles.

Results

The study was conducted in 43 patients. The population pharmacokinetic model (a one-compartment model per compound) was able to capture the very complex absorption process of capecitabine. Statistically significant covariates were cytidine deaminase, alkaline phosphatase and dihydrouracilemia (UH2)/uracilemia (U) ratio. UH2/U ratio was the most significant covariate on 5-FU elimination and CDA on the transformation of 5′-DFCR in 5′-DFUR. A trend was observed between 5-FU AUC and thrombopenia toxicity grades, but not with other toxicities. Best clinical response was not linked to systemic exposure of capecitabine metabolites.

Conclusion

In our study, we propose a model able to describe, meanwhile, and its main metabolites, with a complex absorption process and inclusion of enzyme activity covariates such as CDA and UH2/U ratio.
Trial registration Eudract 2008-004136-20, 2008/11/26
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Metadata
Title
Population pharmacokinetic and pharmacodynamic modeling of capecitabine and its metabolites in breast cancer patients
Authors
Nastja Lunar
Marie-Christine Etienne-Grimaldi
Pauline Macaire
Fabienne Thomas
Florence Dalenc
Jean-Marc Ferrero
Xavier Pivot
Gérard Milano
Bernard Royer
Antonin Schmitt
Publication date
01-02-2021
Publisher
Springer Berlin Heidelberg
Published in
Cancer Chemotherapy and Pharmacology / Issue 2/2021
Print ISSN: 0344-5704
Electronic ISSN: 1432-0843
DOI
https://doi.org/10.1007/s00280-020-04208-8

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