Abstract
A phase I study of 5-fluorouracil 600 mg/m2/week and folinic acid 500 mg/m2/week on day 1 and cisplatin administered weekly on day 2 was carried out on 30 patients with metastatic colorectal carcinoma of which 20 patients were pretreated with 5-fluorouracil. The first group of patients received cisplatin at the dose of 5 mg/m2/week. Cisplatin was then escalated to 10, 15, 20, 25, 30, and 35 mg/m2/week for subsequent groups of patients. Gastrointestinal side-effects were the dose-limiting toxicity. A therapy related death was seen at the dose of 35 mg/m2/week of cisplatin. The maximally tolerated dose of cisplatin in combination with 5-fluorouracil and citrovorum factor is 20 mg/m2/week. The optimally tolerated dose of 5-fluorouracil is 400 mg/m2/week in modulation with citrovorum factor 500 mg/m2/week. The recommended doses for a phase II study are cisplatin 20 mg/m2/week, 5-fluorouracil 400 mg/m2/week, and citrovorum factor 500 mg/m2/week.
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