The Pathology of Vinyl Chloride Exposed Mice |
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Authors: | B Holmberg T Kronevi M Winell |
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Institution: | 17.Section of Occupational Toxicology, National Board of Occupational Safety and Health, Stockholm, and the National Veterinary Institute, Stockholm, Sweden ;27.National Board of Occupational Safety and Health, P. O. Box S-100 26, Stockholm, Sweden |
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Abstract: | Outbred albino laboratory mice were exposed to 50 p.p.m. and 500 p.p.m. vinyl chloride by inhalation 6 hrs./day, 5 days/week during 52 and 26 weeks, respectively. Pathologic examination showed the presence of histologically benign alveologenic lung adenomas, haem-angiosarcomas in fat tissue as well as a few benign and malignant tumours at various sites. Only one liver haemangiosarcoma was noted. All animals exposed to 500 p.p.m. developed tumours; 71 % of the animals given 50 p.p.m. were tumour bearing. The frequency of all tumours, number of tumour foci and size of foci in both groups suggest a dose-dependent carcinogenic effect of vinyl chloride. Haemocoelia due to blood vessel rupture was a common cause of death. Telangiectasis of the liver was also observed in a few animals. The role of fat tissue as well as blood vessel involvement in the pathology of vinyl chloride is discussed. |
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Keywords: | vinyl chloride haemangiosarcoma mouse carcinogenicity fat tissue blood vessel |
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