ToxSci Advance Access published online on January 25, 2007
Toxicological Sciences, doi:10.1093/toxsci/kfm008
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Human Health and Endocrine Disruption: A Simple Multi-Criteria Framework for the Qualitative Assessment of Endpoint-Specific Risks in a Context of Scientific Uncertainty.
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* Centre for Environmental Policy, Imperial College London, London SW7 2AZ, United Kingdom, olwenn.martin{at}ic.ac.uk, n.voulvoulis{at}imperial.ac.uk
School of Water Sciences, Cranfield University, Cranfield, Bedforshire MK43 0AL, United Kingdom, j.lester{at}cranfield.ac.uk
Experimental Medicine, Toxicology & Gastroenterology Group, Faculty of Medicine, Imperial College London, London W12 0NN, United Kingdom, a.boobis{at}imperial.ac.uk
1 to whom correspondence should be addressed at Experimental Medicine, Toxicology & Gastroenterology Group, Faculty of Medicine, 9S10B Commonwealth Building, Hammersmith Campus, Du Cane Road, London W12 0NN, United Kingdom. Tel: +44 (0)20 8383 3221. Fax: +44 (0)20 8383 2066. Email: a.boobis{at}imperial.ac.uk
Received October 18, 2006; accepted January 10, 2007
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Abstract |
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Endocrine disruption remains one of the most controversial contemporary environmental issues. While the desired level of protection is ultimately a societal choice, endocrine toxicity could result in a wide spectrum of adverse health effects. Although the application of the causal framework of weight-of-evidence approaches to complex toxicological issues has incited much interest, no international criteria or guidance have yet been developed. In this context, the evidence on endpoint-specific risks to human health contained in the IPCS Global assessment of the State-of-Science on Endocrine Disruptors report was updated and assessed qualitatively using three simple criteria relevant to the practical application of the Precautionary Principle; incidence trends, association and consequence. The current degree of knowledge was then ranked according to ignorance, uncertainty and risk. The main sources of scientific uncertainty in relation to incidence trends were associated with the evolution of diagnostic criteria or diagnostic tests, while genetic susceptibility is often proposed as an explanation for the wide geographic variations in the incidence of some diseases. Such genetic polymorphisms are also offered as a potential explanation for some of the inconsistent findings or lack of clear dose-response gradients described under the association criterion. The methodology yielded a relative paucity of data addressing directly the impact for adverse human health effect from both individual and public health perspectives. Results are discussed within the context of the application of the Precautionary Principle. Within a participatory context, this simple framework could provide a useful decision-making tool to both communicate scientific uncertainty to the wider public and manage uncertain risks.
Key Words: Endocrine toxicology – endocrine disruptors; risk assessment- regulatory policy; risk assessment - epidemiology.
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