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Toxicological Sciences 64, 7-13 (2001)
Copyright © 2001 by the Society of Toxicology

FORUM

Significant Shortcomings of the U.S. Environmental Protection Agency's Latest Draft Risk Characterization for Dioxin-Like Compounds

Thomas B. Starr,1

TBS Associates, 7500 Rainwater Road, Raleigh, North Carolina 27615

The United States Environmental Protection Agency (U.S. EPA) has concluded that 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) is a human carcinogen, and it has stated that the lifetime all-cancer mortality risk attributable solely to the current background body burden of dioxin-like compounds could be as high as 1.3 per 100. U.S. EPA's most current human cancer risk estimate was obtained from a linear dose-response model fit to the data from three epidemiology studies of TCDD-exposed chemical workers. Herein it is shown that the U.S. EPA model fails to provide an adequate fit to that data, whereas an intercept-only model, having no slope whatsoever, is entirely adequate. Although the epidemiology data used by U.S. EPA are consistent with a significant elevation in all-cancer mortality, by about 32%, among TCDD-exposed workers, this elevation should not be attributed to the workers' TCDD exposure.

Key Words: TCDD; U.S. EPA; dioxin; carcinogen; risk assessment.


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