Faculty Collaboration Database

A comparison of the pharmacokinetics of the anticancer MET inhibitor foretinib free base tablet formulation to bisphosphate salt capsule formulation in patients with solid tumors. Invest New Drugs 2012 Feb;30(1):327-34

Date

09/16/2010

Pubmed ID

20842406

DOI

10.1007/s10637-010-9536-x

Scopus ID

2-s2.0-84856540747 (requires institutional sign-in at Scopus site)   17 Citations

Abstract

PURPOSE: This phase I, open-label, randomized, 2-part crossover study assessed the safety, pharmacokinetics and relative bioavailability of single doses of the anticancer MET inhibitor foretinib (formerly known as GSK1363089, EXEL-2880 and XL-880) free base tablet formulation compared to a bisphosphate salt capsule formulation (Part 1), and assessed the safety, efficacy, and pharmacokinetics of the bisphosphate salt capsule administered 3 times a week in cancer patients (Part 2).

PATIENTS AND METHODS: In Part 1, patients were randomized in a crossover manner to receive a single oral dose of foretinib formulated as a bisphosphate salt capsule (240 mg; 183 mg free base equivalent) followed one week later by a single dose of a free base tablet (180 mg), or vice versa where the treatment sequence was reversed. In Part 2, patients self-administered oral doses of bisphosphate salt capsules (200 mg) 3 times a week until disease progression.

RESULTS: Twelve patients with solid tumors were enrolled and completed Part 1, and 10 patients continued into Part 2. Most AEs were mild or moderate in severity. The most common drug-related AEs were fatigue, diarrhea, and nausea. The least-squares (LS) mean total area under the curve was 3144 and 3514 ng*h/mL for the free base tablet and bisphosphate salt capsule, respectively, with a ratio of 0.89 (90% confidence interval, CI: 0.69, 1.16). The LS mean maximal concentration (Cmax) was 81.6 and 98.5 ng/mL for the free base and bisphosphate salt, respectively, with a ratio of 0.83 (90% confidence interval, CI: 0.67, 1.02). The time to reach Cmax was ∼4 h for both formulations. The pharmacokinetics of foretinib were not clinically different between the 2 formulations. Of the 10 patients assessed for efficacy, 3 patients achieved stable disease.

CONCLUSIONS: Foretinib was well tolerated as single doses of both the free base and bisphosphate salt formulations. The pharmacokinetics and relative bioavailability of the 2 formulations were not clinically different. The bisphosphate salt formulation was well tolerated on a 3-times a week dosing schedule, and reached steady-state plasma concentration after 2 weeks.

Author List

Naing A, Kurzrock R, Adams LM, Kleha JF, Laubscher KH, Bonate PL, Weller S, Fitzgerald C, Xu Y, LoRusso PM

Author

Razelle Kurzrock MD Center Associate Director, Professor in the Medicine department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Administration, Oral
Adult
Aged
Angiogenesis Inhibitors
Anilides
Area Under Curve
Biological Availability
Capsules
Chemistry, Pharmaceutical
Cross-Over Studies
Diphosphates
Drug Compounding
Female
Humans
Least-Squares Analysis
Male
Middle Aged
Neoplasms
Protein Kinase Inhibitors
Proto-Oncogene Proteins c-met
Quinolines
Tablets
Treatment Outcome
Young Adult