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On page 836, a sentence read "In some cases, a tumor promotion assay is used, but there are no data from classic carcinogenic bioassays available to be used for calculating TEFs. (The most potent PCB by TEFs, congener 126, is not tumorigenic in a 2-year rodent bioassay; ref. 103)."

This text should be replaced with the following. "In some cases, a tumor promotion assay is used, but there is a single report in the literature of a classic carcinogenic bioassay available for an individual PCB congener (PCB 126) to be used to compare to TEFs estimated from other endpoints."

The citation for this sentence should be the following.

Walker NJ, Crockett PW, Nyska A, Brix AE, Jokinen MP, Sells DM, Hailey JR, Easterling M, Haseman JK, Yin M, Wyde ME, Bucher JR, Portier CJ. Dose-additive carcinogenicity of a defined mixture of "dioxin-like compounds." Environ Health Perspect. 2005;113(1):43-8.

On page 836, a sentence is cited incorrectly. The sentence read "It is unknown whether the experimental studies used for the determination of TEFs can be extrapolated to humans and what is the appropriateness of these toxicologic noncancer end points for predicting human cancer risk (195, 196)."

The sentence should not have been cited and References (195) and (196) were placed in error.

	References

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1. Shields PG. Understanding Population and Individual Risk Assessment: The Case of Polychlorinated Biphenyls. Cancer Epidemiol Biomarkers Prev 2006;15:830–9.[Abstract/Free Full Text]

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