BACKGROUND: T900607 is a novel tubulin active agent which disrupts microtubule polymerization by a unique mechanism of action. This phase I trial was conducted to determine the maximum tolerated dose, recommended phase II dose, pharmacokinetic properties and toxicities of this agent. PATIENTS AND METHODS: Patients with advanced and/or metastatic solid malignancies were enrolled, for an open dose escalation of T900607 administered intravenously over 30 minutes every 21-days. RESULTS: Thirty patients were enrolled on 7 dose levels ranging from 15 to 270 mg/m(2). No DLTs were seen until 270 mg/m(2), the sixth dose level, with 1 patient experiencing Grade 3 thrombocytopenia, 1 grade 4 troponin increase and 1 grade 5 myocardial infarction in an expanded cohort of 6 patients. The dose was decreased to 180 mg/m(2) with increased cardiac monitoring and at this dose 3/4 patients experienced cardiac toxicity. Further animal cardiotoxicity studies failed to reveal any cardiac effects and the study was reopened at 130 mg/m(2); of 6 enrolled patients, 1 had grade 3 drug related lethargy considered to be a DLT and this dose was considered the RP2D. No objective responses were seen but stable disease was reported in 7/20. Pharmacokinetic analysis showed that AUC and C(max) increased with dose with considerable intrapatient variability, a short half life of < 1 hour, and no apparent dose dependency clearance. CONCLUSIONS: The recommended phase II dose for T900607 is 130 mg/m(2) given as an intravenous infusion over 60 minutes on a 21-day cycle. Cardiac toxicity was seen with this schedule.
BACKGROUND: T900607 is a novel tubulin active agent which disrupts microtubule polymerization by a unique mechanism of action. This phase I trial was conducted to determine the maximum tolerated dose, recommended phase II dose, pharmacokinetic properties and toxicities of this agent. PATIENTS AND METHODS: Patients with advanced and/or metastatic solid malignancies were enrolled, for an open dose escalation of T900607 administered intravenously over 30 minutes every 21-days. RESULTS: Thirty patients were enrolled on 7 dose levels ranging from 15 to 270 mg/m(2). No DLTs were seen until 270 mg/m(2), the sixth dose level, with 1 patient experiencing Grade 3 thrombocytopenia, 1 grade 4 troponin increase and 1 grade 5 myocardial infarction in an expanded cohort of 6 patients. The dose was decreased to 180 mg/m(2) with increased cardiac monitoring and at this dose 3/4 patients experienced cardiac toxicity. Further animal cardiotoxicity studies failed to reveal any cardiac effects and the study was reopened at 130 mg/m(2); of 6 enrolled patients, 1 had grade 3 drug related lethargy considered to be a DLT and this dose was considered the RP2D. No objective responses were seen but stable disease was reported in 7/20. Pharmacokinetic analysis showed that AUC and C(max) increased with dose with considerable intrapatient variability, a short half life of < 1 hour, and no apparent dose dependency clearance. CONCLUSIONS: The recommended phase II dose for T900607 is 130 mg/m(2) given as an intravenous infusion over 60 minutes on a 21-day cycle. Cardiac toxicity was seen with this schedule.
Authors: P Therasse; S G Arbuck; E A Eisenhauer; J Wanders; R S Kaplan; L Rubinstein; J Verweij; M Van Glabbeke; A T van Oosterom; M C Christian; S G Gwyther Journal: J Natl Cancer Inst Date: 2000-02-02 Impact factor: 13.506
Authors: E M Antman; M J Tanasijevic; B Thompson; M Schactman; C H McCabe; C P Cannon; G A Fischer; A Y Fung; C Thompson; D Wybenga; E Braunwald Journal: N Engl J Med Date: 1996-10-31 Impact factor: 91.245
Authors: Rachel E Morgan; Sunnoo Ahn; Sandra Nzimiro; Jean Fotie; Mitch A Phelps; Jeffrey Cotrill; Adam J Yakovich; Dan L Sackett; James T Dalton; Karl A Werbovetz Journal: Chem Biol Drug Des Date: 2008-12 Impact factor: 2.817