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Fosså, S D; Flokkmann, A; Heier, M; Aas, M; Moe, B; Heintz, R; Linder-Ciccolunghi, S
Cancer chemotherapy and pharmacology, 1986, Letnik: 18, Številka: 3Journal Article
Eighteen patients with advanced solid cancer were treated with daily 5'-dFUrd infusions given over 1 h on days 1-5 of a 4-week cycle. Nine patients received 3 g/m2 5'-dFUrd daily and another nine patients 5 g/m2. One patient on 5 g/m2 5'-dFUrd was not fully evaluable for tolerability due to early death (progressive disease) 4 weeks after the first cycle. A total of 48 cycles was given. The gastrointestinal and hematological toxicity was generally mild (grade 1-2). Central neurotoxicity (ataxia, unsteadiness, diplopia, dysarthria, sometimes confusion) was observed in 7 of 8 patients on 5 g/m2 5'-dFUrd leading to premature discontinuation of treatment in 3 patients (after 2 cycles). Only 3 of the 9 patients in the 3 g/m2 group had slight signs of cerebellopathy. Typically, the reversible neurological side effects started at the end of the 2nd week of a cycle. The serum elimination kinetics of 5'-dFUrd and its metabolites 5-FU and 5'-dFUH2 have been investigated in the serum and showed very low intra- and interindividual variations. Peak concentrations of the 5'-dFUrd at the end of the infusion approximated 500 mumol/l and 1000 mumol/l for the 3 g/m2 and 5 g/m2 group, respectively. The peak of the serum 5-FU was reached at the same time, the ratio 5-FU/5'-dFUrd being around 10%. The elimination half-life time for 5-FU was protracted by a factor of 2-3 compared with the direct injection of 5-FU. Monthly infusion of 5'-dFUrd 5 mg/m2 per day on days 1-5 lead to an unacceptable frequency and degree of neurological toxicity. Similar infusions of 5'-dFUrd 3 g/m2 per day on days 1-5 were well tolerated.
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