Abstract | PURPOSE: EXPERIMENTAL DESIGN: Patients received DE-310 as a 3-hour infusion once every 2 weeks (dose, 1.0-2.0 mg/m(2)) or once every 6 weeks (dose, 6.0-9.0 mg/m(2)). Because pharmacokinetics revealed a drug terminal half-life exceeding the 2 weeks administration interval, the protocol was amended to a 6-week interval between administrations also based on available information from a parallel trial using an every 4 weeks schedule. Conjugated DX-8951 (the carrier-linked molecule), and the metabolites DX-8951 and glycyl-DX-8951 were assayed in various matrices up to 35 days post first and second dose. RESULTS: Twenty-seven patients were enrolled into the study and received a total of 86 administrations. Neutropenia and grade 3 thrombocytopenia, and grade 3 hepatotoxicity with veno-occlusive disease, were dose-limiting toxicities. Other hematologic and nonhematologic toxicities were mild to moderate and reversible. The apparent half-life of conjugated DX-8951, glycyl-DX-8951, and DX-8951 was 13 days. The area under the curve ratio for conjugated DX-8951 to DX-8951 was 600. No drug concentration was detectable in erythrocytes, skin, and saliva, although low levels of glycyl-DX-8951 and DX-8951 were detectable in tumor biopsies. One patient with metastatic adenocarcinoma of unknown primary achieved a histologically proven complete remission. One confirmed partial remission was observed in a patient with metastatic pancreatic cancer and disease stabilization was noted in 14 additional patients. CONCLUSIONS: The recommended phase II dose of DE-310 is 7.5 mg/m(2) given once every 6 weeks. The active moiety DX-8951 is released slowly from DE-310 and over an extended period, achieving the desired prolonged exposure to this topoisomerase I inhibitor.
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Authors | Otto Soepenberg, Maja J A de Jonge, Alex Sparreboom, Peter de Bruin, Ferry A L M Eskens, Gerda de Heus, Jantien Wanders, Peter Cheverton, Murray P Ducharme, Jaap Verweij |
Journal | Clinical cancer research : an official journal of the American Association for Cancer Research
(Clin Cancer Res)
Vol. 11
Issue 2 Pt 1
Pg. 703-11
(Jan 15 2005)
ISSN: 1078-0432 [Print] United States |
PMID | 15701859
(Publication Type: Clinical Trial, Clinical Trial, Phase I, Journal Article)
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Chemical References |
- Antineoplastic Agents, Phytogenic
- DE-310 cpd
- Topoisomerase I Inhibitors
- Camptothecin
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Topics |
- Adult
- Aged
- Antineoplastic Agents, Phytogenic
(administration & dosage, pharmacokinetics)
- Area Under Curve
- Camptothecin
(administration & dosage, analogs & derivatives, pharmacokinetics)
- Dose-Response Relationship, Drug
- Drug Administration Schedule
- Drug Resistance, Neoplasm
- Female
- Humans
- Infusions, Intravenous
- Male
- Maximum Tolerated Dose
- Middle Aged
- Neoplasms
(metabolism, pathology)
- Remission Induction
- Salvage Therapy
- Time Factors
- Topoisomerase I Inhibitors
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