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Saito T, Iida S, Abe M, Jones K, Kawanishi T, Twelves C. Population pharmacokinetic–pharmacodynamic modelling and simulation of neutropenia induced by TP300, a novel topoisomerase I inhibitor. J Pharm Pharmacol 2013; 65:1168-78. [DOI: 10.1111/jphp.12065] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2012] [Accepted: 03/06/2013] [Indexed: 12/19/2022]
Abstract
Abstract
Objectives
TP300 is a novel topoisomerase I inhibitor with neutropenia as a significant toxicity. We developed and evaluated a pharmacokinetic–pharmacodynamic (PK-PD) model, using data from Phase I and II trials to predict neutrophil decrease in patients treated with TP300.
Methods
Plasma drug concentrations of TP300, its active form TP3076 and active metabolite TP3011 and absolute neutrophil counts (ANCs) from a Phase I trial were analysed as a training dataset. A two-plus-two-compartment model was applied to the pharmacokinetics of TP3076 and TP3011. A semi-mechanistic model was used to describe the PK-PD relationship between the plasma concentration of TP3076 and TP3011, and changes in ANC.
Key findings
The model fitted well to plasma concentrations of TP3076 and TP3011. Model appropriateness was confirmed in a Phase II trial validation dataset. Body weight and liver biochemistry values were identified as covariates. A semi-mechanistic PK-PD model was applied and the longitudinal decrease in ANC was simulated. Neutrophil counts reached their nadir approximately 2 weeks after administration of TP300, and the proportion of subjects affected increased with dose.
Conclusions
This PK-PD model to predict neutropenia following treatment with TP300 fitted well the decrease in ANC with total concentration of TP3076 and TP3011.
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Affiliation(s)
- Tomohisa Saito
- Research Planning Department, Chugai Pharmaceutical Co., Ltd, Tokyo, Japan
| | - Satofumi Iida
- Research Planning Department, Chugai Pharmaceutical Co., Ltd, Tokyo, Japan
| | - Masaichi Abe
- Research Planning Department, Chugai Pharmaceutical Co., Ltd, Tokyo, Japan
| | - Keith Jones
- Chugai Pharmaceuticals Europe Ltd., London, UK
| | - Takehiko Kawanishi
- Research Planning Department, Chugai Pharmaceutical Co., Ltd, Tokyo, Japan
| | - Chris Twelves
- St James Institute of Oncology, University of Leeds & Leeds Teaching Hospitals Trust, Leeds, UK
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