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Absorption, metabolism, and excretion of the antiemetic rolapitant, a selective neurokinin-1 receptor antagonist, in healthy male subjects

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Summary

Rolapitant is a neurokinin-1 receptor antagonist that is approved in combination with other antiemetic agents in adults for the prevention of delayed nausea and vomiting (CINV) associated with initial and repeat courses of emetogenic cancer chemotherapy, including but not limited to highly emetogenic chemotherapy. Here, we assessed the absorption, metabolism, and excretion of 14C-labeled rolapitant in healthy male subjects. Rolapitant was administered as a single 180-mg oral dose containing approximately 100 μCi of total radioactivity, with plasma, urine, and fecal samples collected at defined intervals after dosing. Rolapitant had a large apparent volume of distribution, indicating that it is widely distributed into body tissues. Rolapitant was slowly metabolized and eliminated with a mean half-life of 186 h. Exposure to the major metabolite of rolapitant, C4-pyrrolidinyl hydroxylated rolapitant or M19, was approximately 50% of rolapitant exposure in plasma. Renal clearance was not a significant elimination route for rolapitant-related entities. Total radioactivity recovered in urine accounted for 14.2% of the dose, compared to 72.7% recovery in feces. Adverse events (AEs) were generally mild; there were no serious AEs, and no clinically significant changes in laboratory or electrocardiogram parameters were observed. The combination of rolapitant safety, its long half-life, extensive tissue distribution, and slow elimination via the hepatobiliary route (rather than renal excretion) suggest suitability that a single dose of rolapitant may provide protection against CINV beyond the first 24 h after chemotherapy administration.

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Acknowledgments

The authors wish to acknowledge the contribution of the scientists at Schering-Plough Corporation in the execution of the study; to thank Jan Jaap van Lier, MD, who was the primary investigator for this study; and to thank Pearl Pathways, LLC for initial manuscript drafting. Writing and editorial support, funded by TESARO, Inc. (Waltham, MA, USA) and coordinated by Hemant Vyas, PhD of TESARO Inc., was provided by Tiffany Brake, PhD and Beverly Stanley, ELS of Team 9 Science, Vaniam Group (Chicago, IL, USA). All authors were involved in the collection, analysis, and interpretation of data, the writing of the manuscript, and the decision to submit the manuscript for publication.

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Correspondence to Xiaodong Wang.

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Funding for this study and for the preparation of this manuscript was provided by TESARO, Inc. All authors are employees or former employees of the study sponsor. The authors have indicated that they have no other conflicts of interest regarding the content of this article. Professional medical writing support was used to develop this article.

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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.

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Informed consent was obtained from all individual participants included in the study.

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Zhang, ZY., Wang, J., Kansra, V. et al. Absorption, metabolism, and excretion of the antiemetic rolapitant, a selective neurokinin-1 receptor antagonist, in healthy male subjects. Invest New Drugs 37, 139–146 (2019). https://doi.org/10.1007/s10637-018-0638-1

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