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Int J Mol Med. 2000 Mar;5(3):275-8.

Regression of experimental liver tumor after distant intra-hepatic injection of cytosine deaminase-expressing tumor cells and 5-fluorocytosine treatment.

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Unite INSERM 364, Faculte de Medecine, 06107 Nice, Cedex 2, France.


Cytosine deaminase (CD) gene of E. coli converts the non-toxic compound 5-fluorocytosine (5-FC) into 5-fluorouracil. We have introduced a vector expressing the CD gene in a rat colon carcinoma cell line. Expression of the CD gene confers 5-FC sensitivity to these cells in vitro and in vivo. In a bifocal model consisting in a simultaneous engrafment of a CD+ tumor on one lobe of the liver and a wild-type parental tumor on the opposite lobe, treatment with 5-FC results in regression of both type of tumors, indicating the existence of a distant bystander effect.

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