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Clinical Trials |
1 Albert Einstein College of Medicine,2 Department of Molecular Pharmacology, and3 Albert Einstein Comprehensive Cancer Center, Bronx, New York;4 New York University Comprehensive Cancer Center of New York University School of Medicine, New York, New York;5 Bristol-Myers Squibb, Princeton, New Jersey; and6 Bristol-Myers Squibb, Wallingford, Connecticut
Purpose: The purpose of this study was to determine the maximum tolerated dose, toxicity, and pharmacokinetics of BMS-247550 administered as a 1-h i.v. infusion every 3 weeks.
Experimental Design: Patients with advanced solid malignancies were premedicated and treated with escalating doses of BMS-247550. Blood sampling was performed to characterize the pharmacodynamics and pharmacokinetics of BMS-247550.
Results: Twenty-five patients were treated at six dose levels ranging from 7.4 to 59.2 mg/m2. At 50 mg/m2, 4 of 9 patients (44.4%) had dose-limiting toxicity (neutropenia, abdominal pain/nausea). At 40 mg/m2 (the recommended Phase II dose), 2 of 12 patients (16.7%) had dose-limiting neutropenia. Overall, the most common nonhematological toxicity was fatigue/generalized weakness (grade 3–4 seen in 9.0% of patients), followed by neurosensory deficits manifested as peripheral neuropathy and by gastrointestinal discomfort. At 40 mg/m2, the incidence of grade 3 fatigue, abdominal pain, diarrhea, and neuropathy was 7.7%. Grade 1–2 neuropathy was observed in all patients enrolled and treated at 40 mg/m2. Two patients with paclitaxel-refractory ovarian cancer, one patient with taxane-naïve breast cancer, and another patient with docetaxel-refractory breast cancer had objective partial responses (lasting 6.0, 5.3, 3.0, and 4.5 months, respectively). The mean pharmacokinetic parameter values during course 1 for clearance, volume of distribution, and apparent terminal elimination half-life at the 40 mg/m2 (recommended Phase II dose) dose level were 21 liters/h/m2, 826 liters/m2, and 35 h (excluding one outlier of 516 h), respectively. Values during course 1 and course 2 were similar.
Conclusions: The recommended dose for Phase II evaluation of BMS-247550 is 40 mg/m2, although more long-term observations are needed. BMS-247550 has advantages over taxanes in relation to drug resistance and warrants further study.
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