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RECORD NUMBER: 32 OF 2104

OLS Field Name OLS Field Data
Main Title 24-month Oncogenicity Study of Methylene Chloride in Mice Final Report p 1-50 Only.
CORP Author Hazleton Labs. America, Inc., Rockville, MD.; Environmental Protection Agency, Washington, DC. Office of Toxic Substances.
Year Published 2000
Report Number 45-8303005
Stock Number OTS0505606
Additional Subjects Toxicology ; Health effects ; Methylene Chloride ; Chronic Toxicity ; Combined Chronic Toxicity/carcinogenicity ; Mammals ; Mice ; Oral ; Diet ; Toxic substances ; Laboratory animals ; CAS No 75-09-2
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NTIS  OTS0505606 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 03/10/2010
Collation 57p
Abstract
Chronic toxicity and oncogenicity of dichloromethane were evaluated in groups of B6C3F1 mice exposed to dichloromethane orally in deionized drinking water at nominal target dose levels of (number of males/females): 0 (60/50), 0 (65/50), 60 (200/100), 125 (100/50), 185 (100/50) or 250 mg/kg/day (125/50) for 24 months. There were no significant differences between treated animals and controls in the following: tissue masses, body weights, water consumption, leukocyte counts, necropsy findings, or histopathology with respect to focal or multifocal hepatocellular hyperplasia, proliferative hepatocellular lesions, adenoma or carcinoma. The only significant sign of toxicity was a marginal increase in the amount of positively staining material in the livers of high-dose groups of both sexes.