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Pharmacokinetic-pharmacodynamic modeling of the schedule-dependent effect of CHS 828 in a rat hollow fiber model
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Pharmacy, Department of Pharmaceutical Biosciences, Division of Pharmacokinetics and Drug Therapy.
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Manuscript (Other academic)
URN: urn:nbn:se:uu:diva-90238OAI: oai:DiVA.org:uu-90238DiVA: diva2:162527
Available from: 2003-04-15 Created: 2003-04-15 Last updated: 2011-03-01
In thesis
1. Pharmacokinetic-Pharmacodynamic Modelling of Anticancer Drugs: Haematological Toxicity and Tumour Response in Hollow Fibres
Open this publication in new window or tab >>Pharmacokinetic-Pharmacodynamic Modelling of Anticancer Drugs: Haematological Toxicity and Tumour Response in Hollow Fibres
2003 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Established quantitative relationships between dose, plasma concentrations and response [pharmacokinetic-pharmacodynamic (PKPD) models] have a high potential in improving therapeutic indices of anticancer drug therapy and in increasing drug development efficiency. PKPD modelling is a helpful tool for characterising and understanding schedule dependence. The aim of this thesis was to develop PKPD models of anticancer drugs for tumour effects and haematological toxicity, which is the most frequent dose-limiting toxicity.

PK and haematological toxicity after several schedules were studied in rats and semi-physiological PKPD models for the whole time course of myelosuppression were developed from animal and patient data. The possibility to implant hollow fibres filled with tumour cells in immunocompetent rats was investigated for simultaneous assessment of PK, tumour response and haematological toxicity. Population data analyses were performed using the software NONMEM.

When all injections were administered within eight hours, fractionated schedules of 5-fluorouracil and epirubicin produced similar haematological toxicity in rats as a single dose, when the non-linear PK of 5-fluorouracil was accounted for. When the time interval was extended to two days for 5-fluorouracil, the fractionated regimens were more toxic.

The developed semi-physiological PKPD models included transit compartments that mimic maturation stages in bone marrow and explain the time lag. Feedback mechanisms characterised the rebound. The models successfully described myelosuppression in patients (DMDC) and rats (5-fluorouracil), after different administration schedules. Further developments made it possible to characterise the time course of myelosuppression after administration of each one of six different drugs, with parameters related to the haematopoietic system consistent across drugs.

The developed hollow fibre model in immunocompetent rats was successfully applied to monitor PK, toxicity and the time course of antitumour effects. PKPD modelling illustrated that the schedule dependence of the anticancer agent CHS 828 is partly due to dose-dependent bioavailability and partly due to a schedule-dependent PD effect.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2003. 71 p.
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Pharmacy, ISSN 0282-7484 ; 286
Pharmacokinetics/Pharmacotherapy, Farmakokinetik/Farmakoterapi
National Category
Pharmaceutical Sciences
Research subject
Pharmacokinetics and Drug Therapy
urn:nbn:se:uu:diva-3370 (URN)91-554-5587-5 (ISBN)
Public defence
2003-05-09, B41, BMC, Uppsala, 09:15
Available from: 2003-04-15 Created: 2003-04-15Bibliographically approved

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Friberg, Lena E.Karlsson, Mats O.
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