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Limited sampling models for topotecan pharmacokinetics

L J van Warmerdam¹, J Verweij, H Rosing

¹Dept of Clinical Pharmacy, Slotervaart Hospital, Amsterdam, The Netherlands.

Annals of Oncology : Official Journal of the European Society for Medical Oncology

|March 1, 1994

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New limited sampling models accurately estimate topotecan

Area of Science:

Pharmacokinetics
Drug metabolism
Population studies

Background:

Limited sampling models are needed for topotecan pharmacokinetic studies.
Estimating Area Under the Curve (AUC) and its metabolite AUC (AUC Tm) is crucial.

Purpose of the Study:

To develop and validate limited sampling models for topotecan pharmacokinetics.
To enable accurate estimation of topotecan AUC and AUC Tm from sparse data.

Main Methods:

Models developed and validated using 34 pharmacokinetic curves from 19 patients.
Utilized plasma concentrations at 2 hours post-infusion for estimation.

Main Results:

A single-point model was optimal for predicting topotecan AUC and AUC Tm.

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Models demonstrated unbiased and precise predictions within a dosage range of 0.5-1.5 mg/m2/day.

Reliable prediction of clearance and total AUC was achieved; half-life prediction was imprecise.

Conclusions:

The developed limited sampling models are suitable for large-scale population pharmacokinetic studies.
These models can facilitate future research on topotecan's pharmacokinetic/pharmacodynamic relationships.