Abstract:
BACKGROUND:UFT is composed of tegafur, a prodrug of 5-fluorouracil, and uracil, at a fixed ratio of 1: 4. UFT is widely used with leucovorin as adjuvant chemotherapy in patients with colon cancer. As reported, UFT/leucovorin should not be taken simultaneously with food because a high fat content will reduce the systemic exposure to the active cytotoxic moiety of UFT. In this single-dose, randomized, two-way crossover study, we investigated the effects of a low-fat Japanese meal on the pharmacokinetics and oral bioavailability of UFT (2 x 100-mg capsules; dose in terms of tegafur) and leucovorin (1 x 25-mg tablet). METHODS:Patients (n = 12) were randomly assigned to receive both drugs after an overnight fast or 5 min after eating a standard Japanese breakfast (641 kcal), with a 3-day washout period between treatments. Pharmacokinetics (n = 12) were determined for tegafur, 5-fluorouracil, uracil, leucovorin, and 5-methyltetrahydrofolate (an active metabolite of leucovorin). RESULTS:For 5-fluorouracil pharmacokinetics, the maximum plasma concentration and the area under the curve were reduced by 73.7% and 47.4%, respectively, when UFT was taken postprandially, and the maximum plasma concentration and the area under the curve for uracil were reduced by 84.1% and 68.9%, respectively, compared with dosing on an empty stomach. These decreases in the systemic exposure to 5-fluorouracil were quite marked and may have an impact on its antitumor effect. CONCLUSION:A low-fat meal affects the pharmacokinetics of UFT similarly to a high-fat meal.
journal_name
Int J Clin Oncoljournal_title
International journal of clinical oncologyauthors
Furuhata T,Meguro M,Nishidate T,Okita K,Ishiyama G,Iwayama Y,Hosokawa Y,Tsuruma T,Kimura Y,Mizuguchi T,Sasaki Kdoi
10.1007/s10147-009-0919-ysubject
Has Abstractpub_date
2009-12-01 00:00:00pages
529-33issue
6eissn
1341-9625issn
1437-7772journal_volume
14pub_type
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