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CLINICAL TRIAL, PHASE I
JOURNAL ARTICLE
RESEARCH SUPPORT, N.I.H., EXTRAMURAL
RESEARCH SUPPORT, NON-U.S. GOV'T
Phase I clinical trial of oxaliplatin in children and adolescents with refractory solid tumors.
Journal of Clinical Oncology 2007 June 2
PURPOSE: To evaluate the maximum-tolerated dose (MTD), dose-limiting toxicity (DLT), pharmacokinetics (PK), and adverse effect profile of oxaliplatin in pediatric patients with refractory solid tumors and to determine whether carbamazepine reduces oxaliplatin-induced neurotoxicity.
PATIENTS AND METHODS: Three regimens of oxaliplatin (given intravenously over 2 hours) were tested: regimen A (100 mg/m2, 130 mg/m2, or 160 mg/m2 every 3 weeks to determine the MTD of oxaliplatin); regimen B (to determine whether carbamazepine starting 24 hours before and ending 48 hours after oxaliplatin reduced the dose-limiting neurotoxicity and increased the MTD of regimen A); and regimen C (to evaluate the safety of a fixed dose two-thirds the MTD of regimen A given every 2 weeks [more frequent administration but comparable dose intensity]).
RESULTS: Twenty-six patients were enrolled on regimens A (n = 11), B (n = 6), and C (n = 9). The DLT was grade 3 pharyngolaryngeal dysesthesia, sensory neuropathy, and ataxia at 160 mg/m2. The MTD was 130 mg/m2 every 3 weeks. At the MTD, the median clearance rate of ultrafiltrable platinum was 9.7 L/h/m2 (range, 6.5 to 15.5 L/h/m2). Addition of carbamazepine permitted dose escalation to 160 mg/m2 without DLT. DLT was not observed with a fixed dose of 85 mg/m2 given every 2 weeks. On all regimens, hematologic toxicity was mild. No significant nephrotoxicity, ototoxicity, or cumulative neurologic toxicity was observed.
CONCLUSION: The DLT, MTD, PK, and adverse effect profile of oxaliplatin in pediatric patients with refractory solid tumors are similar to those observed in adults. Carbamazepine may reduce the dose-limiting neurotoxicity of oxaliplatin.
PATIENTS AND METHODS: Three regimens of oxaliplatin (given intravenously over 2 hours) were tested: regimen A (100 mg/m2, 130 mg/m2, or 160 mg/m2 every 3 weeks to determine the MTD of oxaliplatin); regimen B (to determine whether carbamazepine starting 24 hours before and ending 48 hours after oxaliplatin reduced the dose-limiting neurotoxicity and increased the MTD of regimen A); and regimen C (to evaluate the safety of a fixed dose two-thirds the MTD of regimen A given every 2 weeks [more frequent administration but comparable dose intensity]).
RESULTS: Twenty-six patients were enrolled on regimens A (n = 11), B (n = 6), and C (n = 9). The DLT was grade 3 pharyngolaryngeal dysesthesia, sensory neuropathy, and ataxia at 160 mg/m2. The MTD was 130 mg/m2 every 3 weeks. At the MTD, the median clearance rate of ultrafiltrable platinum was 9.7 L/h/m2 (range, 6.5 to 15.5 L/h/m2). Addition of carbamazepine permitted dose escalation to 160 mg/m2 without DLT. DLT was not observed with a fixed dose of 85 mg/m2 given every 2 weeks. On all regimens, hematologic toxicity was mild. No significant nephrotoxicity, ototoxicity, or cumulative neurologic toxicity was observed.
CONCLUSION: The DLT, MTD, PK, and adverse effect profile of oxaliplatin in pediatric patients with refractory solid tumors are similar to those observed in adults. Carbamazepine may reduce the dose-limiting neurotoxicity of oxaliplatin.
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