Environmental Groups Are Praising the E.P.A. for Updating Cancer-Risk Guidelines
By MICHAEL JANOFSKY
Published: April 4, 2005
WASHINGTON, April 3 - A remarkable thing happened here last week: the Environmental Protection Agency announced a set of guidelines, and environmental groups were largely complimentary in response.
The agency's new approach to assessing chemicals that might cause cancer won praise for replacing guidelines that were nearly 20 years old and for taking into account, for the first time, the likelihood that children may be more vulnerable to exposure than adults.
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Cancer guidelines inform agency regulators how a substance might cause cancer in humans. When the first risk assessments were adopted in 1986, they generally reflected research on laboratory animals, leading to uncontroversial assumptions by agency scientists that if a substance caused cancer in an animal, it would also cause cancer in a human. The assessments influence new regulations on chemicals found in air, water, pesticides, waste and former Superfund sites.
In recent years, however, a growing number of studies have refined efforts to analyze the impact of chemicals on humans, in some cases leading agency scientists to determine that substances harmful to animals do not necessarily pose risks for humans. Newer studies also show that some substances may be more harmful to humans than once thought. Dr. Farland cited research that now suggests that benzene, a chemical used in the manufacture of a variety of products, is a potential threat to humans at lower levels than previous studies showed.
The new guidelines also reflect how more recent studies show the differences between cancer-causing chemicals in adults and young children, recognizing the possibility that children younger than 2 might be 10 times more at risk and children from 2 to 16 might be 3 times more at risk....
http://www.nytimes.com/2005/04/04/politics/04cancer.html