Two pseudodiploid human breast carcinomas studied with G-band technique.
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Biomedical subjects
Publications and source records attributed to J Mark.
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Chromosomes of induced carcinomas in the oral mucosa and epidermis of rats were studied in vitro. The tumours were induced by repeated applications of one of two carcinogens: the fat-soluble 7,12-dimethylbenz (a) anthracene (DMBA) or the water-soluble 4-nitrochinoline N-oxide (4NQO). Non-random chromosomal patterns, different for each carcinogen, were revealed, irrespective of the location of the tumour. The DMBA-induced carcinomas showed the same karyotypic deviations as those in leukemias and sarcomas induced in the rat by the same carcinogen. The 4NQO-induced carcinomas displayed chromosome features similar to those previously observed in embryonic rat tissue subjected to malignant transformation by the same agent.
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Fibrosarcomas induced in Chinese hamsters and rats by Rous sarcomla virus and 7,12-dimethylbenz(a)anthracene are associated with nonrandom chromosome variation. Although histologically indistinguishable, the tumors induced by the virus or chemical in each host species are characterized by completely different karyotypic patterns.
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