Abstract | PURPOSE: The purpose is to determine the maximum tolerated dose, profile of adverse events, and dose-limiting toxicity of Kahalalide F (KF) in patients with androgen refractory prostate cancer. Furthermore, the pharmacokinetics after KF administration and preliminary antitumor activity were evaluated. KF is a dehydroaminobutyric acid-containing peptide isolated from the marine herbivorous mollusk, Elysia rufescens. EXPERIMENTAL DESIGN: Adult patients with advanced or metastatic androgen refractory prostate cancer received KF as an i.v. infusion over 1 hour, during five consecutive days every 3 weeks. The starting dose was 20 microg per m(2) per day. Clinical pharmacokinetics studies were done in all patients using noncompartmental analysis. Prostate-specific antigen levels were evaluated as a surrogate marker for activity against prostate cancer. RESULTS: Thirty-two patients were treated at nine dose levels (20-930 microg per m(2) per day). The maximum tolerated dose on this schedule was 930 microg per m(2) per day. The dose-limiting toxicity was reversible and asymptomatic Common Toxicity Criteria grade 3 and 4 increases in transaminases. The recommended dose for phase II studies is 560 microg per m(2) per day. Pharmacokinetics analysis revealed dose linearity up to the recommended dose. Thereafter, a more than proportional increase was observed. Elimination was rapid with a mean (SD) terminal half-life (t(1/2)) of 0.47 hour (0.11 hour). One patient at dose level 80 microg per m(2) per day had a partial response with a prostate-specific antigen decline by at least 50% for > or =4 weeks. Five patients showed stable disease. CONCLUSIONS: KF can be given safely as a 1-hour i.v. infusion during five consecutive days at a dose of 560 microg per m(2) per day once every 3 weeks.
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Authors | Jeany M Rademaker-Lakhai, Simon Horenblas, Willem Meinhardt, Ellen Stokvis, Theo M de Reijke, José M Jimeno, Luis Lopez-Lazaro, José A Lopez Martin, Jos H Beijnen, Jan H M Schellens |
Journal | Clinical cancer research : an official journal of the American Association for Cancer Research
(Clin Cancer Res)
Vol. 11
Issue 5
Pg. 1854-62
(Mar 01 2005)
ISSN: 1078-0432 [Print] United States |
PMID | 15756010
(Publication Type: Clinical Trial, Clinical Trial, Phase I, Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Antineoplastic Agents, Hormonal
- Depsipeptides
- Mollusk Venoms
- kahalalide F
- Prostate-Specific Antigen
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Topics |
- Aged
- Aged, 80 and over
- Antineoplastic Agents, Hormonal
(pharmacology)
- Depsipeptides
(administration & dosage, adverse effects, pharmacokinetics)
- Drug Resistance, Neoplasm
- Humans
- Infusions, Intravenous
- Male
- Maximum Tolerated Dose
- Middle Aged
- Mollusk Venoms
- Prostate-Specific Antigen
(analysis)
- Prostatic Neoplasms
(drug therapy, pathology)
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