Abstract
Purpose
Develop a physiologically based pharmacokinetic (PBPK) model of ivosidenib using in vitro and clinical PK data from healthy participants (HPs), refine it with clinical data on ivosidenib co-administered with itraconazole, and develop a model for patients with acute myeloid leukemia (AML) and apply it to predict ivosidenib drug–drug interactions (DDI).
Methods
An HP PBPK model was developed in Simcyp Population-Based Simulator (version 15.1), with the CYP3A4 component refined based on a clinical DDI study. A separate model accounting for the reduced apparent oral clearance in patients with AML was used to assess the DDI potential of ivosidenib as the victim of CYP3A perpetrators.
Results
For a single 250 mg ivosidenib dose, the HP model predicted geometric mean ratios of 2.14 (plasma area under concentration–time curve, to infinity [AUC0-∞]) and 1.04 (maximum plasma concentration [Cmax]) with the strong CYP3A4 inhibitor, itraconazole, within 1.26-fold of the observed values (2.69 and 1.0, respectively). The AML model reasonably predicted the observed ivosidenib concentration–time profiles across all dose levels in patients. Predicted ivosidenib geometric mean steady-state AUC0-∞ and Cmax ratios were 3.23 and 2.26 with ketoconazole, and 1.90 and 1.52 with fluconazole, respectively. Co-administration of the strong CYP3A4 inducer, rifampin, predicted a greater DDI effect on a single dose of ivosidenib than on multiple doses (AUC ratios 0.35 and 0.67, Cmax ratios 0.91 and 0.81, respectively).
Conclusion
Potentially clinically relevant DDI effects with CYP3A4 inducers and moderate and strong inhibitors co-administered with ivosidenib were predicted. Considering the challenges of conducting clinical DDI studies in patients, this PBPK approach is valuable in ivosidenib DDI risk assessment and management.
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Data availability
Investigators interested in data sharing and collaboration should contact the corresponding author.
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Acknowledgements
We would like to dedicate this article to the memory of our colleague, David Dai. We would like to thank the healthy participants and patients taking part in these studies. Assistance with manuscript preparation was provided by Christine Ingleby, PhD, CMPP, Excel Medical Affairs, Horsham, UK, and supported by Agios.
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This study was supported financially by Agios Pharmaceuticals, Inc.
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C.P., B.F., K.L., and H.Y. were employees of and stockholders in Agios Pharmaceuticals, Inc., at the time of the study. A.K. is an employee of a contract research organization, Certara UK Ltd.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This article does not contain any studies with animals performed by any of the authors.
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Bin Fan, Kha Le, and Hua Yang: affiliation at time of study.
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Prakash, C., Fan, B., Ke, A. et al. Physiologically based pharmacokinetic modeling and simulation to predict drug–drug interactions of ivosidenib with CYP3A perpetrators in patients with acute myeloid leukemia. Cancer Chemother Pharmacol 86, 619–632 (2020). https://doi.org/10.1007/s00280-020-04148-3
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DOI: https://doi.org/10.1007/s00280-020-04148-3