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Original Article

Immediate Ascites Conversion of Mammary Tumors Induced in NYLR/Nya Mice by 7,12-Dimethylbenz-[a] Anthracene and Urethane Feeding and by Forced Breeding

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Pages 109-126 | Published online: 11 Jun 2009
 

Abstract

Intragastric feeding of dimethylbenz-[a]anthracene in corn oil together with urethane in the drinking water and forced breeding were successful in rapidly inducing (2-4 months) mammary tumors (adenoacanthomas) in inbred NYLR/Nya mice, which have a low incidence of spontaneous breast tumors and of other tumors. The tumors could be quickly and permanently transformed to an ascites form by intraperitoneal inoculation of enzyme-dissociated cells and subsequent serial passage of free cells. Only 10 (3 in some cases) serial passages were required, thus conveniently providing multiple isogeneic carcinoma cell lines in this strain of mice. Some tumor cell lines proliferated strongly in the abdominal cavity even on the first passage.

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