Abstract
Objective
The aim of this analysis was to develop a population pharmacokinetic model to describe the pharmacokinetics of recombinant human erythropoietin (rHuEPO) in healthy subjects, after intravenous and subcutaneous administration over a wide dose range, and to examine the influence of demographic characteristics and other covariates on the pharmacokinetic parameters of rHuEPO.
Methods
Erythropoietin serum concentration data were available from 16 studies comprising 49 healthy subjects who received rHuEPO intravenous doses from 10 to 300 IU/kg, 427 healthy subjects who received rHuEPO subcutaneous doses from 1 to 2400 IU/kg, and 57 healthy subjects who received placebo and where endogenous erythropoietin concentrations were measured. Different pharmacokinetic models were fitted to the dataset using nonlinear mixed-effects modeling software (NONMEM, Version V, Level 1). Several patient covariates were tested in order to quantify the effect on rHuEPO pharmacokinetic parameters. Model evaluation was examined using a posterior predictive check.
Results
Erythropoietin showed a diurnal baseline variation of ±20%, described with a dual cosine model. Disposition was described with a two-compartment model with a small volume of distribution (6L) and parallel linear and nonlinear clearance. Total clearance varied between 0.3 and 0.9 L/h over the concentration range studied. A dual absorption model was used to characterise the rHuEPO absorption from the subcutaneous formulation and consisted of a faster pathway described as a sequential zero- and first-order absorption process and a parallel slower pathway characterised as a zero-order process. The bioavailability of subcutaneous rHuEPO increased from 30% at low doses to 71% at the highest dose of 160 kIU and was described using a hyperbolic model. The most important covariate effects were a decrease in the first-order absorption rate constant (ka) with increasing age, an increase in subcutaneous bioavailability with increasing baseline haemoglobin, and a decrease in bioavailability with increasing bodyweight. A posterior predictive check showed no systematic deviation of the simulated data from the observed values.
Conclusion
The population pharmacokinetic model developed is suitable to describe the pharmacokinetic behaviour of rHuEPO after intravenous and subcutaneous administration in healthy subjects, over a wide dose range.
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Notes
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Acknowledgements
Part of the content of this manuscript was presented as a poster (Olsson-Gislekog P, Jacqmin P, Perez-Ruixo JJ. Population pharmacokinetics of rHuEpo in healthy volunteers) at the XIV Meeting of the Population Approach Group in Europe (http://www.page-meeting.org/) in Pamplona, Spain, in June 2005.
The authors would like to thank Vladimir Piotrovsky, Andrew Chow and especially Wing Cheung for the comments and suggestions provided during the completion of this analysis. Juan Jose Perez Ruixo is an employee at Johnson & Johnson Pharmaceutical Research & Development, and Per Olsson-Gileskog and Philippe Jacqmin received consultation fees from Johnson & Johnson Pharmaceutical Research & Development. This study was supported by Johnson & Johnson Pharmaceutical Research & Development, a Division of Janssen Pharmaceutica, N.V., Beerse, Belgium.
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Olsson-Gisleskog, P., Jacqmin, P. & Perez-Ruixo, J.J. Population Pharmacokinetics Meta-Analysis of Recombinant Human Erythropoietin in Healthy Subjects. Clin Pharmacokinet 46, 159–173 (2007). https://doi.org/10.2165/00003088-200746020-00004
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DOI: https://doi.org/10.2165/00003088-200746020-00004