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Carcinogenic potency correlations: real or artifactual?

R L Kodell1, D W Gaylor, J J Chen

  • 1National Center for Toxicological Research, Food and Drug Administration, Jefferson, Arkansas 72079.

Journal of Toxicology and Environmental Health
|January 1, 1991
PubMed
Summary
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Carcinogenic potency estimates are not solely artifacts of experimental design. The one-hit model used in bioassays imposes significant constraints, influencing these estimates more than design choices.

Area of Science:

  • Toxicology
  • Biostatistics
  • Cancer Research

Background:

  • Interspecies correlations in carcinogenic potency estimates from bioassays have been questioned.
  • Concerns exist that experimental design may introduce tautology, affecting potency estimates.
  • Some researchers propose that potency estimates are primarily artifacts of experimental design.

Purpose of the Study:

  • To investigate the influence of experimental design versus statistical modeling on carcinogenic potency estimates.
  • To challenge the notion that carcinogenic potency estimates are mere artifacts of bioassay design.

Main Methods:

  • Analysis of constraints imposed by the one-hit model for carcinogenic potency estimation.
  • Comparison of statistical model constraints with potential experimental design constraints.

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Main Results:

  • The constraints inherent in applying the one-hit model are more restrictive than those potentially arising from experimental design.
  • The one-hit model's limitations significantly shape carcinogenic potency estimations.

Conclusions:

  • Carcinogenic potency estimates are substantially influenced by the statistical model employed, specifically the one-hit model.
  • The restrictive nature of the one-hit model plays a more critical role than experimental design artifacts in shaping potency estimates.