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Quantitative Cancer Risk Estimation for Formaldehyde

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  • Thomas B. Starr

Abstract

Of primary concern are irreversible effects, such as cancer induction, that formaldehyde exposure could have on human health. Dose‐response data from human exposure situations would provide the most solid foundation for risk assessment, avoiding problematic extrapolations from the health effects seen in nonhuman species. However, epidemiologic studies of human formaldehyde exposure have provided little definitive information regarding dose‐response. Reliance must consequently be placed on laboratory animal evidence. An impressive array of data points to significantly nonlinear relationships between rodent tumor incidence and administered dose, and between target tissue dose and administered dose (the latter for both rodents and Rhesus monkeys) following exposure to formaldehyde by inhalation. Disproportionately less formaldehyde binds covalently to the DNA of nasal respiratory epithelium at low than at high airborne concentrations. Use of this internal measure of delivered dose in analyses of rodent bioassay nasal tumor response yields multistage model estimates of low‐dose risk, both point and upper bound, that are lower than equivalent estimates based upon airborne formaldehyde concentration. In addition, risk estimates obtained for Rhesus monkeys appear at least 10‐fold lower than corresponding estimates for identically exposed Fischer‐344 rats.

Suggested Citation

  • Thomas B. Starr, 1990. "Quantitative Cancer Risk Estimation for Formaldehyde," Risk Analysis, John Wiley & Sons, vol. 10(1), pages 85-91, March.
  • Handle: RePEc:wly:riskan:v:10:y:1990:i:1:p:85-91
    DOI: 10.1111/j.1539-6924.1990.tb01023.x
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    Cited by:

    1. James D. Wilson, 1991. "A Usually Unrecognized Source of Bias in Cancer Risk Estimations," Risk Analysis, John Wiley & Sons, vol. 11(1), pages 11-12, March.

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