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• W2069474927 abstract "We have studied 21 patients infused for 72 hours with 5-Fluorouracil (5-FU) at progressive doses combined with hyperfractionated radiation. The schedule was chosen as being one capable of inducing 5-FU radiosensitization (RS). All patients were started at a daily 5-FU dose of 40 mg/kg/24 hours; doses were then escalated with each subsequent treatment cycle to limiting toxicity or until taken off study. Patients received between one and six infusion cycles. Every treatment cycle included coincident hyperfractionated radiation to various body areas including the abdomen, chest, and head and neck region. Radiation fractionation was invariant; 1,000 rad were delivered in four equal fractions. Two fractions of 250 rad each were given on days 1 and 2 of each three day 5-FU cycle, i.e. at approximately 0, 8, 24, and 32 hours into the drug infusion. Patients were followed for toxicity; serum 5-FU concentrations were determined using a high pressure liquid chromatographic assay. 5-FU clearances were calculated from the mean serum drug levels and the infused drug dose. The toxicity spectrum was not found to be significantly different from infused drug alone in this dose range save when the head and neck region received coincident irradiation. In that region the two anticipated toxicities combined in what appears to be a synergistic fashion to enhance mucositis. Most toxicities including gastrointestinal and bone marrow appeared dependent on the mean serum 5-FU level as did mucositis itself. 5-FU clearance was found to be non-linear in this dose region but did not appear influenced by radiation to any part of the body. This study shows that 72-hour infused 5-FU can be combined with external beam radiation and will produce reasonably predictable toxicity patterns which depend on the region of the body being irradiated. 5-FU toxicity correlates with mean serum drug level which is itself dependent on 5-FU clearance. Minor variations in 5-FU clearance therefore probably contribute to the natural range found in the dose-response relationship for infused 5-FU toxicities. Future studies should integrate this understanding of 5-FU pharmacokinetics into treatment regimens. The combination of infused 5-FU and coincident radiation appears useful in treating several tumor types, particularly squamous and squamous-like cancers. However, further scheduling and radiation fractionation studies are desirable to optimize 5-FU RS in man and to quantify late effects." @default.
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• W2069474927 date "1985-04-01" @default.
• W2069474927 modified "2023-09-23" @default.
• W2069474927 title "Phase I and pharmacologic study of 72-hour infused 5-fluorouracil and hyperfractionated cyclical radiation" @default.
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• W2069474927 doi "https://doi.org/10.1016/0360-3016(85)90313-x" @default.
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