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- W1968200013 abstract "PURPOSE: To determine the maximum tolerated duration of infusions at the fixed gemcitabine dose rate of 10 mg/m2/min and to analyze the pharmacodynamic actions in leukemia blasts during gemcitabine therapy. PATIENTS AND METHODS: The study was conducted in a phase I trial by escalating the duration of gemcitabine infusion at a fixed-dose rate of 10 mg/m2/min. Patients with relapsed or refractory acute myelogenous leukemia (AML) received gemcitabine for 8.0 (n = 3), 10.0 (n = 3), 12.5 (n = 8), 15.5 (n = 3), or 18.0 hours (n = 2). Pharmacokinetic and pharmacodynamic investigations were undertaken in circulating AML blasts. RESULTS: Gemcitabine was infused for up to 18 hours at the fixed-dose rate. Four patients had grade 3 toxicities at longer infusion schedules. One patient had a partial remission; two others had a reduction in blasts and concomitant rise in neutrophils. Gemcitabine triphosphate was detectable in AML cells even at 1 hour after the start of infusion in eight patients. The concentration ranged from 130 to 900 μmol/L at the end of the infusion. Consistently, there was a rapid decline in DNA synthesis, which remained suppressed at 85% to 95% during and for at least 10 hours after the end of the infusion. Compared with levels in cells measured before therapy, at 8 hours after the start of the infusion, there was a decline in the cellular purine deoxynucleotide pools. CONCLUSION: At the fixed-dose rate of 10 mg/m2/min, gemcitabine could be administered for longer than 12 hours without untoward toxicity. The favorable toxicity profile and pharmacokinetic and pharmacodynamic features warrant combination with DNA-damaging agents." @default.
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- W1968200013 date "2002-02-01" @default.
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- W1968200013 title "Prolonged Infusion of Gemcitabine: Clinical and Pharmacodynamic Studies During a Phase I Trial in Relapsed Acute Myelogenous Leukemia" @default.
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- W1968200013 doi "https://doi.org/10.1200/jco.20.3.665" @default.
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