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RECORD NUMBER: 34 OF 44

Main Title Pharmacokinetically Based Risk Assessment of Workplace Exposure to Benzene. (Journal Version).
Author Beliles, R. P. ; Totman, L. C. ;
CORP Author Environmental Protection Agency, Washington, DC. Office of Health and Environmental Assessment. ;George Washington Univ. Medical Center, Washington, DC.
Publisher c1989
Year Published 1989
Report Number EPA/600/J-89/005;
Stock Number PB89-235089
Additional Subjects Benzene ; Industrial atmospheres ; Risk ; Toxicity ; Rodents ; Malignant neoplasms ; Bioassay ; Dosage ; Metabolism ; Exposure ; Pharmacokinetics ; Occupational health and safety ; Animal disease models
Holdings
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Status
NTIS  PB89-235089 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 12p
Abstract
Cancer risk from exposure to benzene for a working lifetime was estimated from data obtained in studies with rodents. Cancers of the Zymbal gland and the blood-forming system were selected as endpoints for the assessment because of their consistent occurrence. The combined metabolites were judged from toxicological data to be the best representative of the reactive agent. Because of similarity in the percentages of lifetime exposed in the rodent studies and in the occupational setting, the amount metabolized/day as a result of exposures 5 days a week for a lifetime was judged to be an appropriate dose paradigm for this assessment. Derived Michaelis-Menton constants were used to convert the doses of combined metabolites from the pharmacokinetic studies to the doses used in the bioassays. Scaling across species was based on allometric relationships. Experimental data were used to scale doses across species with body weight ratios raised to the exponents of 0.74 for the inhalation route and 1.0 for the oral route. The occupational lifetime cancer risk estimated from rodent data was 6 to 14 cases/1000 workers, which is consistent with the 9.5 to 174 leukemia cases/1000 estimated by others from epidemiological data. (Copyright 1989 by Academic Press, Inc.)