Record Display for the EPA National Library Catalog

RECORD NUMBER: 13 OF 18

OLS Field Name OLS Field Data
Main Title Pharmacokinetics in Low Dose Extrapolation Using Animal Cancer Data.
Author Whittemore, A. S. ; Crosser, S. ; Silvers, A. ;
CORP Author Stanford Univ., CA. ;Electric Power Research Inst., Palo Alto, CA.;Health Effects Research Lab., Research Triangle Park, NC.
Publisher c1986
Year Published 1986
Report Number EPA-R-813495; EPA/600/J-86/528;
Stock Number PB90-232240
Additional Subjects Neoplasms ; Carcinogens ; Toxicology ; Laboratory animals ; Bioassay ; Formulas(Mathematics) ; Computerized simulation ; Tables(Data) ; Reprints ; Pharmacokinetics ; Dose-response relationships
Holdings
Library Call Number Additional Info Location Last
Modified
Checkout
Status
NTIS  PB90-232240 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 08/27/1990
Collation 10p
Abstract
Data on rodents exposed to carcinogens indicate that their tumor probabilities are proportional to effective concentrations of parent compound or metabolites at the target tissues. This proportionality suggests that observed nonlinear dose-response curves reflect dose-dependent kinetics between applied dose rate and effective concentrations. Therefore, low dose extrapolation procedures that include pharmacokinetic data could improve extrapolation accuracy. To test such procedures, bioassay and pharmacokinetic 'data' were simulated. Then, ignoring the mechanisms generating the data, four extrapolation procedures were used to estimate tumor probability at a low applied dose rate. Two of the procedures use a pharmacokinetic model and simulated pharmacokinetic data, and two do not. The pharmacokinetic model used for extrapolation was only an approximation to the one used to generate the pharmacokinetic data. (Copyright (c) 1986 by the Society of Toxicology.)