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Aromatic amines: mechanisms of carcinogenesis and implications for risk assessment

Hans-Guenter Neumann1

  • 1Department of Toxicology, University of Wuerzburg, Germany. hg-neumann@t-online.de

Frontiers in Bioscience (Landmark Edition)
|June 3, 2010
PubMed

Insights

Regulating carcinogenic aromatic amines is crucial. Due to linear dose-response for DNA damage and complex non-genotoxic effects, traditional safety limits are uncertain, necessitating a "contribution to risk" approach.

Area of Science:

  • Environmental Health
  • Toxicology
  • Chemical Regulation

Background:

  • Carcinogenic aromatic amines are prevalent environmental contaminants.
  • Tumor development requires both genotoxic and non-genotoxic effects.
  • Metabolic activation and macromolecular interaction are key mechanisms.

Purpose of the Study:

  • To evaluate the limitations of traditional risk assessment for carcinogenic aromatic amines.
  • To propose a shift in perspective from "risk" to "contribution to risk" for regulatory approaches.
  • To highlight the importance of the ALARA principle in managing exposure.

Main Methods:

  • Analysis of dose-response relationships for genotoxic and non-genotoxic effects.
  • Evaluation of factors influencing risk, including background exposure and chemical interactions.
  • Review of established toxicological principles and regulatory frameworks.

Main Results:

  • Linear dose-response for irreversible DNA damage precludes a no-effect level (NEL).
  • Non-linear dose-response for reversible effects, used for no-observed adverse effect levels (NOAEL), is insufficient.
  • Existing methods fail to account for cumulative and interactive chemical exposures.

Conclusions:

  • Fixed acceptable risk values for aromatic amines are uncertain.
  • A "contribution to risk" framework, incorporating the ALARA principle, is more appropriate.
  • Clear distinction between scientific risk assessment and risk management is essential.

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