Combined chemotherapy of murine mammary tumors by local activation of the prodrugs ifosfamide and 5-fluorocytosine

Item Type:	Article
Title:	Combined chemotherapy of murine mammary tumors by local activation of the prodrugs ifosfamide and 5-fluorocytosine
Creators Name:	Kammertoens, T. and Gelbmann, W. and Karle, P. and Alton, K. and Saller, R. and Salmons, B. and Guenzburg, W.H. and Uckert, W.
Abstract:	The success of chemotherapeutic intervention is limited because the necessary high local drug doses cannot be achieved without systemic toxicity. Application of suicide genes (SGs) and direct conversion of prodrugs (PDs) to toxic metabolites in situ by SGs may enhance the efficacy of chemotherapy. To evaluate this strategy in two murine breast cancer models, TS/A and GR, we injected cellulose sulfate capsules harboring cat kidney cells expressing the SGs cytosine deaminase and cytochrome P450 2B1 (CYP2B1) intratumorally. The PDs 5-fluorocytosine and ifosfamide were administered in 3-day intervals. The effect of in situ chemotherapy with each PD alone and the combination was analyzed over a period of 100 days. The results reveal that for TS/A tumors, the antitumoral effect mediated by CYP2B1 is more efficient than that of cytosine deaminase, whereas for GR tumors, both systems worked equally well. Furthermore, we find additive toxicity using both SG/PD systems for both TS/A and GR tumors.
Keywords:	Cell Line, Cell Transplantation, Cultured Tumor Cells, Cytochrome P-450 CYP2B1, Cytosine Deaminase, Experimental Mammary Neoplasms, Flucytosine, Gene Therapy, Ifosfamide, Inbred BALB C Mice, Kidney, Nucleoside Deaminases, Prodrugs, Transfection, Animals, Cats, Mice
Source:	Cancer Gene Therapy
ISSN:	0929-1903
Publisher:	Nature Publishing Group
Volume:	7
Number:	4
Page Range:	629-636
Date:	1 April 2000
Official Publication:	http://www.nature.com/cgt/journal/v7/n4/abs/7700139a.html
PubMed:	View item in PubMed

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