Phase I Study of FixedDoseRate Infusion ofGemcitabine in Patients with Unresectable Pancreatic Cancer
Objective: The purpose of this study was to determine the feasible dose of gemcitabine when administered as a fixed dose rate infusion (10 mg/m/min) on a weekly schedule to Japanese patients with unresectable advanced pancreatic cancer. Methods: Patients were required to have histologically or cytologically proven locally advanced or metastatic pancreatic cancer for which they had received no previous chemotherapy. Gemcitabine was administered intravenously weekly for three consecutive weeks every 4weeks.Patientsat threedose levelswerescheduled to receiveescalating dosesof gemcitabine: 1000 mg/m over 100 min (Level 1), 1200 mg/m over 120 min (Level 2) and 1500 mg/m over 150 min (Level 3). Results:A total of 16patientswereenrolled in thisstudybetweenDecember2003andSeptember 2004. Maximum-tolerated dose was not reached during the first course. Dose-limiting toxicity was Grade 4 neutropenia. Grade 3 or 4 neutropenia was observed at Level 3 in all six patients in the first course, and administration of gemcitabine on Day 8 or 15 was skipped in all six patients. Non-hematologic toxicity was mild and the most common symptoms were anorexia, nausea and vomiting. Partial response was achieved in 1 of the 17 patients (7%). Median overall survival was 7.3 months. Conclusions: Gemcitabine administered at a rate of 10 mg/m/min was tolerated up to 1500 mg/m, but 1200 mg/m represented a more appropriate recommended dose in further studies owing to neutropenia in Japanese patients with advanced pancreatic cancer.