Effects of Mild to Severe Hepatic Impairment on the Pharmacokinetics of Sonidegib: A Multicenter, Open-Label, Parallel-Group Study
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Background and Objective
Sonidegib is a potent, selective and orally bioavailable inhibitor of the Hedgehog signaling pathway, primarily metabolized by the liver. In order to make dose recommendations for patients with hepatic impairment, we have assessed here the pharmacokinetics (PKs) and safety of sonidegib in subjects with varying degrees of hepatic function.
The primary objective of this phase I, multicenter, open-label study was to evaluate the PKs of a single oral 800 mg dose of sonidegib in subjects with impaired hepatic function compared with healthy subjects. PK parameters (e.g. area under the concentration–time curve from time zero to infinity [AUCinf], area under the concentration–time curve from time zero to the last measurable concentration [AUClast], maximum concentration [C max], apparent clearance [CL/F], and terminal half-life [t ½]) for parent drug and the metabolite were compared with the normal group, as the reference. Metabolite ratio, unbound PK parameters, and the relationship between specific PK parameters and liver function parameters were assessed.
In total, 33 subjects entered the study and received sonidegib. Plasma concentrations peaked at approximately 2–3 h in all groups after dosing. Compared with the normal group, AUClast decreased by 35 and 23% and increased by 14% in the mild, severe, and moderate hepatic impairment groups, respectively. The C max values were lower in all groups with respect to the normal group (decreases of 20, 21 and 60% in the mild, moderate and severe hepatic impairment groups, respectively). Protein binding was independent of hepatic function, and similar trends in the PK parameters were observed for unbound sonidegib and the metabolite. Protein binding was similar across all groups. Weak to no correlation between specific PK and hepatic function parameters was found.
Overall, sonidegib exposures were similar or decreased in the hepatic impairment groups compared with the normal group, and sonidegib was generally well-tolerated in all subjects. Dose adjustment is not considered necessary for subjects with mild, moderate, or severe hepatic impairment.
The authors would like to thank Tina Patrick, PhD, of Novartis Ireland Ltd, for providing medical writing and editorial support, which was funded by Novartis AG in accordance with Good Publication Practice (GPP3) guidelines (http://www.ismpp.org/gpp3). They would also like to thank Dr. Tycho Heimbach for his scientific input during manuscript revision.
Compliance with Ethical Standards
This study was sponsored and designed by Novartis Pharma AG, Basel, Switzerland, EudraCT no. 2011-005876-40. Dr. Horsmans, the primary investigator, conducted the study and collected the data; the sponsor and the authors analyzed and interpreted the data; and the sponsor wrote the study report. The authors and the sponsor jointly agreed to submit the manuscript for publication.
Conflict of interest
Yves Horsmans has received consulting fees from Novartis Pharma AG as the principal investigator of the study. Corinne Emotte and Hildegard Boss are employees at Novartis Pharma AG. Henry Castro was an employee at Novartis Pharma AG during the study and is currently employed by Bristol Myers Squibb. Michelle Quinlan, Dalila Sellami, and Jocelyn Zhou are employees of Novartis Pharmaceuticals, and Dalila Sellami owns Novartis stock. Richard A. Preston received a research grant from the University of Miami, Division of Clinical Pharmacology, to conduct this study. Mateva Liudmila, George Golor and Oren Shibolet declare that they have no conflicts of interest.
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.
Informed consent was obtained from all individual participants included in the study.
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