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Dose Optimization in Oncology Drug Development: The Emerging Role of Pharmacogenomics, Pharmacokinetics, and
Apostolos Papachristos1, Jai Patel2, Maria Vasileiou3
1Regeneron Pharmaceuticals, Inc., Tarrytown, NY 10591, USA.
Abstract:
Drugs' safety and effectiveness are evaluated in randomized, dose-ranging trials in most therapeutic areas. However, this is only sometimes feasible in oncology, and dose-ranging studies are mainly limited to Phase 1 clinical trials. Moreover, although new treatment modalities (e.g., small molecule targeted therapies, biologics, and antibody-drug conjugates) present different characteristics compared to cytotoxic agents (e.g., target saturation limits, wider therapeutic index, fewer off-target side effects), in most cases, the design of Phase 1 studies and the dose selection is still based on the Maximum Tolerated Dose (MTD) approach used for the development of cytotoxic agents. Therefore, the dose was not optimized in some cases and was modified post-marketing (e.g., ceritinib, dasatinib, niraparib, ponatinib, cabazitaxel, and gemtuzumab-ozogamicin). The FDA recognized the drawbacks of this approach and, in 2021, launched Project Optimus, which provides the framework and guidance for dose optimization during the clinical development stages of anticancer agents. Since dose optimization is crucial in clinical development, especially of targeted therapies, it is necessary to identify the role of pharmacological tools such as pharmacogenomics, therapeutic drug monitoring, and pharmacodynamics, which could be integrated into all phases of drug development and support dose optimization, as well as the chances of positive clinical outcomes.
Insights
Optimizing drug dosage in cancer treatment is crucial, especially for targeted therapies. Pharmacological tools can enhance dose selection and improve clinical outcomes.
Area of Science:
- Oncology
- Clinical Pharmacology
- Drug Development
Background:
- Traditional dose-finding studies in oncology often rely on the Maximum Tolerated Dose (MTD) approach, originally developed for cytotoxic agents.
- This MTD approach may not be optimal for newer targeted therapies, leading to post-marketing dose adjustments for some anticancer drugs.
- The FDA's Project Optimus initiative aims to address these limitations by guiding dose optimization in anticancer drug development.
Purpose of the Study:
- To highlight the limitations of the MTD approach in modern oncology drug development.
- To emphasize the critical need for dose optimization, particularly for targeted therapies.
- To explore the role of pharmacological tools in supporting optimal dose selection.
Main Methods:
- Review of current practices in oncology clinical trial design and dose selection.
- Analysis of the characteristics of novel therapeutic modalities compared to cytotoxic agents.
- Identification of relevant pharmacological tools for dose optimization.
Main Results:
- The MTD approach, while standard, is often insufficient for optimizing doses of novel anticancer agents.
- Several targeted therapies have required post-marketing dose modifications, indicating suboptimal initial dose selection.
- Pharmacological tools offer potential solutions for improving dose optimization.
Conclusions:
- Dose optimization is essential for maximizing the safety and effectiveness of anticancer drugs, especially targeted therapies.
- Integrating pharmacogenomics, therapeutic drug monitoring, and pharmacodynamics can significantly aid dose optimization throughout clinical development.
- These tools can improve the likelihood of positive clinical outcomes in cancer patients.
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