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Evaluation of Absolute Oral Bioavailability and Bioequivalence of Ribociclib, a Cyclin-Dependent Kinase 4/6 Inhibitor, in Healthy Subjects

Ji, Yan and Abozeid, Ahmed M and Samant, Tanay and Yang, Shu and Rodriguez Lorenc, Cristina (2020) Evaluation of Absolute Oral Bioavailability and Bioequivalence of Ribociclib, a Cyclin-Dependent Kinase 4/6 Inhibitor, in Healthy Subjects. Clinical Pharmacology in Drug Development. ISSN 21607648

Abstract

Ribociclib, a selective and potent cyclin-dependent kinase 4/6 inhibitor, has demonstrated safety and efficacy in combination with endocrine therapy in hormone receptor-positive, human epidermal growth factor receptor-2-negative advanced breast cancer. In 2 open-label crossover studies in healthy participants, the absolute bioavailability of a single oral dose of a ribociclib 600-mg tablet (n = 16) was compared with a single intravenous ribociclib infusion of 150 mg (n = 16), and the bioequivalence of a ribociclib 600-mg tablet (n = 31) and a ribociclib 600-mg capsule (n = 31) was evaluated. The pharmacokinetics of ribociclib and its major metabolite, LEQ803, were assessed in both studies. The oral bioavailability of the 600-mg ribociclib tablet was 65.8% (90% confidence interval [CI], 59.1-73.2%). The geometric mean systemic clearance of ribociclib was moderate (40.2 L/h; 27.4% intersubject variability [CV%]) compared with hepatic blood flow, and the geometric mean volume of distribution was high (979 L; 25.2 CV%). LEQ803-to-ribociclib metabolic ratios were 0.198 for the oral administration and 0.125 for intravenous infusion. Bioequivalence of the tablet and capsule formulations was demonstrated for ribociclib. The geometric mean ratios of maximum concentration and area under the curve from time 0 to last quantifiable concentration and to infinity were 1.01, 1.00, and 0.937, respectively, within the predefined bioequivalence range of 0.80 to 1.25. The median time to reach maximum concentration was 3 hours with both formulations. No serious adverse events were observed in either study.

Item Type: Article
Keywords: clinical pharmacology clinical trials oncology pharmacokinetics and drug metabolism pharmacology
Date Deposited: 18 Aug 2020 00:45
Last Modified: 18 Aug 2020 00:45
URI: https://oak.novartis.com/id/eprint/41332

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