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Biological basis for extrapolation across mammalian species
Regulatory Toxicology and Pharmacology : RTP
|September 1, 1986
Summary
Species extrapolation uses body size to predict biological data, applying allometric equations for reliable animal-to-human dose-response assessments in toxicology.
Area of Science:
- Comparative physiology
- Pharmacokinetics
- Toxicology
Background:
- Species extrapolation relies on shared anatomy, physiology, and biochemistry.
- Allometric equations (Y=aWn) link body size to biological traits for data transfer.
Purpose of the Study:
- Outline the allometric equation as a basis for species extrapolation.
- Review methods and criteria for selecting appropriate extrapolation bases.
- Apply principles to human extrapolation of animal carcinogenicity data.
Main Methods:
- Review experimental data supporting extrapolation methods (e.g., mg/kg, body surface area).
- Discuss criteria for selecting extrapolation bases and assessing reliability.
- Illustrate application to dose-tumor incidence data from carcinogenicity studies.
Main Results:
- Familiar methods (mg/kg, body surface area) are specific cases of the allometric equation (W1.0, W0.67).
- Four guiding principles are presented for selecting extrapolation bases.
- Application to carcinogenicity data involves identifying key components.
Conclusions:
- Allometric scaling provides a framework for interspecies data extrapolation.
- Careful selection of extrapolation bases ensures reliable transfer of biological data.
- This approach aids in human risk assessment from animal study findings.