Comparison of Continuous Infusions and Bolus Injections of 5.Fluorouracil with or without Leucovorin: Implications for Inhibition of Thymidylate Synthase
Abstract
Although 5-fluorouracil (5FU) is in clinical use for more than three decades, it is not clear what is the most efficacious schedule of 5FU administration [1, 2]. For systemic treatment with 5FU a number of different schedules are in clinical use (Table 1). The two major schedules for bolus injections do not show significant differences in either toxicity or antitumor activity. For the prolonged administration schedules, however, the pattern of toxicity changes. For weekly bolus injections, myelotoxicity (mainly leukopenia) is usually dose-limiting; however, at the prolonged administration schedules the pattern of toxicity changes with mucositis and diarrhea as serious site-effects for continuous infusions. In addition, the handfoot syndrome is frequently observed at protracted infusions of several weeks, as well as other skin lesions (see ref. in Table 1). Interestingly the addition of LV to both the bolus injections and the continuous infusions, caused a marked increase in gastrointestinal toxicity. In several schedules this increase of toxicity was the only result of the modulatory agent, with no apparent effect on the antitumor activity.
Keywords
Continuous Infusion Bolus Injection Plasma Pharmacokinetic Biochemical Modulation Advanced Colorectal CarcinomaPreview
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References
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