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Population pharmacokinetics of PM00104 (Zalypsis®) in cancer patients

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Cancer Chemotherapy and Pharmacology Aims and scope Submit manuscript

Abstract

Objective

The aim of this study was to characterize the population pharmacokinetics of PM00104 (Zalypsis®) in cancer patients.

Methods

A total of 135 patients included in four phase I clinical trials who receive intravenous PM00104 at doses ranging from 53 to 5,000 μg/m2 and administered as 1-, 3-, or 24-h infusion every 3 weeks or as 1-h infusion on days 1, 8, and 15 of a 28-day cycle, or 1-h infusion daily during 5 consecutive days every 3 weeks were included in the analysis. Pharmacokinetic data were analyzed with non-linear mixed effect model using NONMEM VI software. The effect of selected patient covariates on PM00104 pharmacokinetics was investigated. Model evaluation was performed using predictive checks and non-parametric bootstrap.

Results

An open four-compartment catenary linear model with first-order elimination was developed to best describe the data. Plasma clearance and its between-subject variability was 43.7 L/h (34%). Volume of distribution at steady state was 822 L (117%). Within the range of covariates studied, age, sex, body size variables, aspartate aminotransferase, alanine aminotransferase, alkaline phosphatase, total bilirubin, lactate dehydrogenase, creatinine clearance, albumin, total protein, hemoglobin, performance status, liver metastases, dose-limiting toxicity, and stable disease for 3 months were not statistically related to PM00104 pharmacokinetic parameters. Bootstrap and posterior predictive check evidenced the model was deemed appropriate to describe the time course of PM00104 plasma concentrations in cancer patients.

Conclusions

The integration of phase I pharmacokinetic data demonstrated PM00104 linear elimination from plasma, dose proportionality up to 5,000 μg/m2, and time-independent pharmacokinetics. No clinically relevant covariates were identified as predictors of PM00104 pharmacokinetics.

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Acknowledgments

The authors thank Dr. Ricardo Nalda Molina for his comments and support at the beginning of this project. In addition, the authors would like to thank the patients, investigators, and their medical, nursing and laboratory staff who participated in the clinical trials included in the present study. In particular, we recognize the effort from the laboratory staff of ICON development solutions, which participated in the bioanalytical analysis of PM00104. Carlos Fernandez Teruel, Bernardo Miguel-Lillo, and Arturo Soto-Matos are employees of Pharma Mar SA, which supported this study. Consulting Projects for Research SL is consultant for Pharma Mar SA and received consultation fees for contributing to the current analysis.

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Correspondence to Carlos Pérez-Ruixo.

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Pérez-Ruixo, C., Valenzuela, B., Fernández Teruel, C. et al. Population pharmacokinetics of PM00104 (Zalypsis®) in cancer patients. Cancer Chemother Pharmacol 69, 15–24 (2012). https://doi.org/10.1007/s00280-011-1644-6

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  • DOI: https://doi.org/10.1007/s00280-011-1644-6

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