Abstract
Purpose
Fedratinib is an oral and selective Janus kinase 2 inhibitor that is indicated for treatment of adults with intermediate-2 or high-risk primary or secondary myelofibrosis. Fedratinib is metabolized by cytochrome P450s (CYPs), primarily CYP3A4. The objective of this study was to determine the effects of the strong CYP3A4 inducer rifampin and moderate CYP3A4 inducer efavirenz on the pharmacokinetics of single doses of fedratinib.
Methods
This Phase 1, open-label, two-part study (Part 1 for rifampin and Part 2 for efavirenz) was conducted in healthy adult men and women. A single dose of fedratinib (500 mg) was administered on Day 1. Participants received rifampin 600 mg daily or efavirenz 600 mg daily on Days 9–18. On Day 17, a single dose of fedratinib (500 mg) was coadministered with rifampin or efavirenz. Plasma fedratinib concentrations were measured using validated liquid chromatography–tandem mass spectrometry.
Results
Maximum observed plasma fedratinib concentrations were lowered by approximately 70% and 30% during coadministration with rifampin or efavirenz, respectively, compared with fedratinib alone. Geometric means of fedratinib area under the plasma concentration–time curve from 0 to infinity were decreased by 81% (90% confidence interval [CI], 77–83%) and 47% (90% CI, 40–53%) during coadministration with rifampin or efavirenz, respectively. Fedratinib was generally well tolerated when administered alone or in combination with rifampin or efavirenz.
Conclusion
Significant reductions in fedratinib exposure were observed in the presence of strong or moderate CYP3A4 inducers. These results suggest that agents that are strong or moderate inducers of CYP3A4 should be avoided when coadministered with fedratinib.
Trial Registration Number
NCT03983239 (Registration date: June 12, 2019).
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Data availability
Data requests may be submitted to Celgene, a Bristol Myers Squibb Company, at https://vivli.org/ourmember/celgene/ and must include a description of the research proposal.
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Acknowledgements
The authors thank study participants and their families who made this study possible and the clinical study teams who participated in the study. The study was supported by Bristol Myers Squibb. Medical writing support was provided by Bridget Sackey Aboagye, PhD, and Alex Loeb, PhD, of Chrysalis Medical Communications, Hamilton, NJ, and funded by Bristol Myers Squibb.
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The clinical trial reported in this manuscript was designed and sponsored by Bristol Myers Squibb.
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KO and GK contributed to the study design, data analysis, interpretation, and draft of the manuscript. All authors critically reviewed the draft of the manuscript, approved the final version to be published, and agreed to be accountable for all aspects of the work. LNC, LL, and ML contributed to the study design, data analysis, and interpretation. MT contributed to the study design, data acquisition, and interpretation. JK and YX contributed to the data acquisition and interpretation. SS, SZ, and MP contributed to the study design and interpretation.
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KO, MT, LL, ML, YX, SS, LNC, SZ, MP, and GK are employees of and hold equity ownership in Bristol Myers Squibb. JK is an employee of Covance.
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Ogasawara, K., Kam, J., Thomas, M. et al. Effects of strong and moderate CYP3A4 inducers on the pharmacokinetics of fedratinib in healthy adult participants. Cancer Chemother Pharmacol 88, 369–377 (2021). https://doi.org/10.1007/s00280-021-04292-4
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DOI: https://doi.org/10.1007/s00280-021-04292-4