Phase I clinical and pharmacologic study of eniluracil plus fluorouracil in patients with advanced cancer

Journal of Clinical Oncology : Official Journal of the American Society of Clinical Oncology
R L SchilskyH Burris

Abstract

To determine the highest dose of fluorouracil (5-FU) that could be safely administered with Eniluracil (776C85; Glaxo Wellcome Inc, Research Triangle Park, NC), an inactivator of dihydropyrimidine dehydrogenase (DPD), on a daily schedule for 5 days, and to define the toxicities of the combination and the pharmacokinetics of 5-FU when administered with 776C85. Patients with advanced solid tumors refractory to standard therapy were enrolled at two institutions. The study consisted of three periods designed to evaluate the safety, pharmacokinetics, and pharmacodynamics of 776C85 alone (period 1); the effects of 776C85 on the pharmacokinetics of 5-FU (period 2); and the maximum-tolerated dose (MTD) of 5-FU, with or without leucovorin, that could be safely administered with 776C85 (period 3). Cohorts of at least three patients each received oral 776C85 alone at doses of 3.7 mg/m2/d, 18.5 mg/m2/d and 0.74 mg/m2/d. After a 14-day washout period, each patient then received 776C85 daily for 3 days, with a single intravenous (i.v.) bolus dose of 5-FU 10 mg/m2 on day 2. After a second washout period, patients were treated with 776C85 daily for 7 days and 5-FU i.v. bolus on days 2 through 6. The starting dose of 5-FU 10 mg/m2/d was escalat...Continue Reading

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