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Interspecies extrapolations in risk analysis.

C C Travis1

  • 1Health and Safety Research Division, Oak Ridge National Laboratory, Tennessee 37831.

Toxicology
|December 1, 1987
PubMed
Summary
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Quantitative risk assessment for carcinogens uses animal data, but extrapolating to humans is challenging. Physiological pharmacokinetic models offer a way to improve these extrapolations between species and exposure routes.

Area of Science:

  • Toxicology
  • Pharmacokinetics
  • Risk Assessment

Background:

  • Quantitative risk assessment for carcinogenic chemicals typically relies on high-dose animal study data.
  • Extrapolating animal study results to human populations presents a significant challenge.
  • Physiological pharmacokinetic (PBPK) models are emerging tools to aid in risk assessment.

Purpose of the Study:

  • To evaluate the utility of PBPK models for extrapolating chemical risk data.
  • To compare PBPK model predictions with experimental data across species and exposure routes.

Main Methods:

  • Development and application of PBPK models for tetrachloroethylene (PCE).
  • Modeling PCE exposure via inhalation and ingestion.
  • Comparison of model outputs with existing experimental data from rat and human studies.

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Main Results:

  • PBPK models provide a framework for interspecies extrapolation of PCE toxicity data.
  • Model predictions for PCE pharmacokinetics align with experimental observations in rats and humans.
  • The models facilitate extrapolation between different routes of chemical administration.

Conclusions:

  • PBPK models are valuable tools for improving the accuracy of quantitative risk assessment.
  • These models can help bridge the gap between animal study findings and human health risks.
  • Application of PBPK models aids in understanding chemical behavior across different exposure scenarios.