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Enhancing triapine treatment: strategies for dose optimization and methemoglobin level mitigation
Heekyung Lee1, Allison Dunn1, Sarah E Taylor2
1Center for Translational Medicine, University of Maryland School of Pharmacy, 20 North Pine Street, Baltimore, MD, 21201, USA.
Cancer Chemotherapy and Pharmacology
|May 20, 2026
Summary
This study developed a pharmacokinetic-pharmacodynamic (PK/PD) model for triapine, revealing smoking increases drug clearance. Dosing adjustments are recommended for smokers to achieve optimal triapine exposure.
Area of Science:
- Pharmacology
- Oncology
- Pharmacometrics
Background:
- Triapine is a ribonucleotide reductase inhibitor used in advanced solid cancers.
- Understanding triapine's pharmacokinetic-pharmacodynamic (PK/PD) profile is crucial for optimizing treatment.
Purpose of the Study:
- To develop a population PK/PD model for triapine.
- To characterize triapine exposure, the impact of smoking, and its relationship with methemoglobin levels.
Main Methods:
- Population PK/PD modeling using nonlinear mixed-effects analysis.
- Analysis of data from 36 patients in two Phase I clinical trials.
- Simulations to optimize oral triapine dosing strategies.
Main Results:
- A two-compartment model with Erlang absorption and first-order elimination best described triapine PK.
- An effect compartment model linked triapine exposure to methemoglobin concentrations.
- Smoking was associated with a 38% increase in triapine clearance; dose adjustments for smokers were suggested.
Conclusions:
- A quantitative PK/PD model for triapine was developed.
- The model can guide dosing regimen optimization for oral triapine.
- Population PK/PD modeling aids decision-making in drug development.
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