The antitumor activity of gemcitabine is not dose-response related but schedule-dependent. Based on the results of a published phase I study in patients with nonsmall-cell lung cancer we started a pilot study of a 24-hr infusion of gemcitabine in patients with adenocarcinoma of the pancreas and biliary tract cancer. Twenty-five patients were enrolled and received a 24-hr infusion of gemcitabine once weekly on three consecutive out of 4 weeks. Dose levels of gemcitabine ranged from 100 to 150 mg/m2. One of 13 chemotherapy-naive patients had a partial response. Dose-limiting toxicity (DLT) was thrombocytopenia in pretreated patients and neutropenia in chemotherapy-naive patients. Other toxicities were oral mucositis, fever, flu-like symptoms, and asthenia. Maximum tolerated dose (MTD), especially in pretreated patients, was 100 mg/m2.
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