Abstract | PURPOSE:
TZT-1027 [N(2)-(N,N-dimethyl-l-valyl)-N-[(1S,2R)-2-methoxy-4-[(2S)-2-[(1R,2R)-1-methoxy-2-methyl-3-oxo-3-[(2-phenylethyl)]amino]propyl]-1-pyrrolidinyl]-1-[(S)-1-methylpropyl]-4-oxobutyl]-N-methyl-l-valinamide] is a cytotoxic dolastatin 10 derivative inhibiting microtubule assembly through the binding to tubulins. The objectives of this phase I study was to assess the dose-limiting toxicities (DLT), to determine the maximum tolerated dose, and to study the pharmacokinetics of TZT-1027 when given i.v. over 60 minutes on days 1 and 8 every 3 weeks to patients with advanced solid tumors. EXPERIMENTAL DESIGN: Patients were treated with escalating doses of TZT-1027 at doses ranging from 1.35 to 2.7 mg/m(2). For pharmacokinetic analysis, plasma sampling was done during the first and second course and assayed using a validated high-performance liquid chromatographic assay with mass spectrometric detection. RESULTS: Seventeen patients received a total of >70 courses. The stopping dose was reached at 2.7 mg/m(2), with neutropenia and infusion arm pain as DLT. Neutropenia was not complicated by fever. Over all dose levels, eight patients experienced pain in the infusion arm 1 to 2 days after administration of the drug, which seemed ameliorated by adding additional flushing after drug administration. Other side effects included nausea, vomiting, diarrhea, and fatigue. One partial response lasting >54 weeks was observed in an extensively pretreated patient with metastatic liposarcoma. The pharmacokinetics of TZT-1027 suggested linearity over the dose ranges. No correlation between body surface area and absolute CL of TZT-1027 was established, vindicating that a flat dosing regimen might be used in the future. A correlation was observed between the percentage decrease in neutrophil count and the AUC of TZT-1027. CONCLUSIONS: In this study, the DLT of TZT-1027 was neutropenia and infusion arm pain. The recommended dose for phase II studies of TZT-1027 is 2.4 mg/m(2) given i.v. over 60 minutes, on days 1 and 8 every 21 days. Phase II studies have recently started.
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Authors | Maja J A de Jonge, Ate van der Gaast, André S T Planting, Leny van Doorn, Aletta Lems, Inge Boot, Jantien Wanders, Masahiko Satomi, Jaap Verweij |
Journal | Clinical cancer research : an official journal of the American Association for Cancer Research
(Clin Cancer Res)
Vol. 11
Issue 10
Pg. 3806-13
(May 15 2005)
ISSN: 1078-0432 [Print] United States |
PMID | 15897580
(Publication Type: Clinical Trial, Clinical Trial, Phase I, Journal Article)
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Chemical References |
- Antineoplastic Agents
- Oligopeptides
- soblidotin
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Topics |
- Adult
- Aged
- Antineoplastic Agents
(administration & dosage, adverse effects, pharmacokinetics)
- Chromatography, High Pressure Liquid
- Drug Administration Schedule
- Female
- Humans
- Infusions, Intravenous
- Male
- Maximum Tolerated Dose
- Middle Aged
- Neoplasms
(drug therapy, metabolism)
- Oligopeptides
(administration & dosage, adverse effects, pharmacokinetics)
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