"The strength of this report lies in the rigorous scientific review process," said Ruth Lunn, director of the National Toxicology Program Office of the Report on Carcinogens, in a news release.
Aristolochic acids have been shown to cause high rates of bladder or upper urinary tract cancer in people with kidney or renal disease who consumed botanical products containing aristolochic acids, according to the report. Despite a U.S. Food and Drug Administration warning against the use of products containing aristolochic acids, it can still be purchased on the Internet and abroad, particularly in herbal products used to treat arthritis, gout and inflammation.
Formaldehyde has long been listed as a substance "reasonable anticipated" to cause cancer after animal studies showed it increased the risk of nasal cancer. Since then, additional studies in humans have shown exposure increases the risk for certain types of rare cancers, including nasopharyngeal (the nasopharnyx is the upper part of the throat behind the nose), sinonasal and myeloid leukemia, a cancer of the white blood cells, prompting federal officials to strengthen its warning.
Formaldehyde is a colorless, flammable, strong-smelling chemical that is widely used to make resins for household items, such as composite wood products, paper product coatings, plastics, synthetic fibers, and textile finishes. Formaldehyde is also used as a preservative in medical laboratories, mortuaries, and in some hair straightening products.
Representatives of industry took issue with the addition of both formadelhyde and styrene to the NTP's list.
"It will unfairly scare workers, plant neighbors and could have a chilling effect on the development of new products," Tom Dobbins, a spokesman for the American Composites Manufacturers Association, told The
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