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Children as a sensitive subpopulation for the risk assessment process.

R Julian Preston1

  • 1Environmental Carcinogenesis Division, National Health and Environmental Effects Research Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, NC 27711, USA. preston.julian@epa.gov

Toxicology and Applied Pharmacology
|August 18, 2004
PubMed
Summary

Children are a sensitive subpopulation for cancer risk assessment. Current guidelines propose adjustments for early-life exposure to mutagenic chemicals, but more data are needed for non-mutagenic ones.

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Area of Science:

  • Environmental Health
  • Toxicology
  • Risk Assessment

Background:

  • Children are a sensitive subpopulation requiring specific consideration in cancer risk assessment.
  • Assessing early-life exposure risks for environmental chemicals is challenging due to limited comparative data.
  • Ionizing radiation data shows increased cancer induction from early-life exposure, unlike current approaches for environmental chemicals.

Purpose of the Study:

  • To evaluate the need for and challenges in incorporating early-life exposure sensitivity into cancer risk assessments for environmental chemicals.
  • To review current regulatory approaches, including those from the U.S. Environmental Protection Agency (EPA), for addressing childhood cancer risks.
  • To highlight data gaps and propose future research directions, such as conducting cancer bioassays with early-life exposures.

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Main Methods:

  • Review of existing scientific literature on childhood cancer induction and sensitivity to environmental exposures.
  • Analysis of current risk assessment guidelines and methodologies used by regulatory agencies like the EPA.
  • Examination of data from rodent bioassays and human studies, including atomic bomb survivors.

Main Results:

  • Early-life exposure to ionizing radiation is more effective at inducing cancer later in life.
  • Rodent bioassay data, primarily used for environmental chemicals, lacks direct comparison for early-life versus adult exposures.
  • The EPA has proposed a 10-fold risk adjustment for the first two years of life and a 3-fold adjustment for ages 3-15 for mutagenic chemicals, with no adjustment for non-mutagenic ones due to data scarcity.

Conclusions:

  • Specific data on early-life exposure sensitivity to environmental chemicals is crucial for accurate risk assessment.
  • Current risk assessment strategies for non-mutagenic chemicals do not adequately account for potential early-life heightened sensitivity.
  • Further research, including comprehensive cancer bioassays incorporating early-life exposures, is essential to refine risk assessment guidelines and protect children.