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  • Title: A phase I study to characterize the safety, tolerability, and pharmacokinetics of topotecan at 4 mg/m2 administered weekly as a 30-minute intravenous infusion in patients with cancer.
    Author: Curtis KK, Hartney JT, Jewell RC, Park JW, Lebowitz PF, Griffin PP, Borad MJ, Fitch TR, Northfelt DW.
    Journal: J Clin Pharmacol; 2010 Mar; 50(3):268-75. PubMed ID: 19808951.
    Abstract:
    Topotecan pharmacokinetics at higher infusion rates (4 mg/m2 over 30 minutes) have not been studied. The authors report a pharmacokinetics and safety study of this dose in advanced cancer patients. Sixteen patients were given a 4-mg/m2 topotecan infusion intravenously (IV) over 30 minutes weekly for 3 weeks, repeated every 28 days. Pharmacokinetics were determined after the first dose. Plasma concentrations of total topotecan were measured to derive CL, V(ss), C(max), t(max), t(1/2), AUC(0-t), and AUC(0-infinity). Plasma total topotecan concentrations decreased biexponentially, with a mean CL value of 20.6 L/h, V(ss) value of 101 L, and t(1/2) value of 5.0 h. Nine significant adverse events (all hematologic) were topotecan related. Grade 3 or less adverse events included anemia, thrombocytopenia, leukopenia, and fatigue. Pharmacokinetics of the 4-mg/m2 infusion of topotecan over 30 minutes are comparable to findings from studies of lower and higher doses. Toxicities are similar to previous reports.
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