Abstract | OBJECT: METHODS: For in vitro studies, 2 glioma cell lines, U87 and U251, were tested to determine the cytotoxic effects of CPT-11 and SN-38 in a dose-dependent manner. In vivo studies were performed by implanting U87 intracranially into athymic/nude mice. For a period of 2 weeks, SN-38, CPT-11, or vehicle was administered intratumorally by means of an osmotic minipump. One series of experiments measured the presence of SN-38 or CPT-11 in the tumor and surrounding brain tissues after 2 weeks' exposure to the drug. In a second series of experiments, after 2 weeks' exposure to the drug, the animals were maintained, in the absence of drug, until death. The survival curves were then calculated. RESULTS: The results show that the animals that had CPT-11 delivered intratumorally by the minipump expressed SN-38 in vivo. Furthermore, both CPT-11 and SN-38 accumulated at higher levels in tumor tissues compared with uninvolved brain. Intratumoral delivery of CPT-11 or SN-38 extended the average survival time of tumor-bearing animals from 22 days to 46 and 65 days, respectively. CONCLUSIONS: These results demonstrate that intratumorally administered CPT-11 can be effectively converted to SN-38 and this method of drug delivery is effective in extending the survival time of animals bearing malignant gliomas.
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Authors | Weijun Wang, Alex Ghandi, Leonard Liebes, Stan G Louie, Florence M Hofman, Axel H Schönthal, Thomas C Chen |
Journal | Journal of neurosurgery
(J Neurosurg)
Vol. 114
Issue 3
Pg. 689-94
(Mar 2011)
ISSN: 1933-0693 [Electronic] United States |
PMID | 20415520
(Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)
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Chemical References |
- Antineoplastic Agents, Phytogenic
- Drug Implants
- Irinotecan
- Camptothecin
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Topics |
- Animals
- Antineoplastic Agents, Phytogenic
(pharmacokinetics)
- Brain
(metabolism)
- Brain Neoplasms
(drug therapy, metabolism)
- Camptothecin
(analogs & derivatives, metabolism, pharmacokinetics)
- Cell Line, Tumor
- Cell Survival
- Chromatography, High Pressure Liquid
- Dose-Response Relationship, Drug
- Drug Delivery Systems
- Drug Implants
- Glioma
(drug therapy, metabolism)
- Humans
- Irinotecan
- Mice
- Mice, Nude
- Survival Analysis
- Tissue Distribution
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