ABSTRACT
Purpose
Trastuzumab treatment is associated with occurrence of cardiac toxicity, for which monitoring of the left ventricular ejection fraction (LVEF) is indicated. The performance of the currently used monitoring protocol as defined in the summary of product characteristics (SPC) is however unknown. The objective of this analysis was to develop a model-based framework for evaluation and optimization of cardiac monitoring strategies.
Methods
The model-based framework comprised a previously developed exposure-response model for trastuzumab induced changes in LVEF, and a protocol-execution model that allowed incorporation of treatment interventions as described by a monitoring protocol. Metrics for evaluation of toxicity, dose intensity and monitoring burden were defined to allow evaluation and optimization of cardiac monitoring protocols.
Results
The success of a protocol-defined dose reduction was improved from 40% for the SPC-based protocol, to 79% for a scoring-based protocol, thereby decreasing the observed severity of cardiotoxicity. Including adaptation based on risk-profile allowed reduction of the mean number of LVEF measurements by 19%.
Conclusions
This model-based evaluation approach enabled evaluation and optimization of cardiac monitoring protocols that would be difficult to evaluate in a clinical setting. This approach can potentially be applied for other drugs that use repeated evaluation of continuous biomarkers for toxicity.
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Abbreviations
- AUC45 :
-
area below a LVEF threshold of 45% and above the LVEF time curve
- FT-AUC45 :
-
full-treatment AUC45
- LVEF:
-
left ventricular ejection fraction
- O-AUC45 :
-
observed AUC45
- PD:
-
pharmacodynamics
- PK:
-
pharmacokinetics
- SPC:
-
summary of product characteristics
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ACKNOWLEDGMENTS and Disclosures
No funding was received for the conduct of this project. The authors declare no conflict of interest.
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van Hasselt, J.G.C., Schellens, J.H.M., Mac Gillavry, M.R. et al. Model-Based Evaluation and Optimization of Cardiac Monitoring Protocols for Adjuvant Treatment of Breast Cancer with Trastuzumab. Pharm Res 29, 3499–3511 (2012). https://doi.org/10.1007/s11095-012-0845-y
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DOI: https://doi.org/10.1007/s11095-012-0845-y