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The National Toxicology Program (NTP) added three new chemicals to the “Report on Carcinogens,” the government’s warning list of known and potentially carcinogenic substances. The substances are 1-bromopropane, also known as n-propyl bromide, which is used in cleaning solvents and spray adhesives; cumene, which is used to make phenol and acetone; and a complex mixture of pentachlorophenol and by-products of its synthesis, which is used as a preservative to treat wooden utility poles. All three are listed as “reasonably anticipated to be a human carcinogen” in the latest version of the report, which NTP released last week. In addition, NTP upgraded the listing for o-toluidine, elevating its classification to a known carcinogen. Previously this substance was listed as “reasonably anticipated to be a human carcinogen.” o-Toluidine is used in making rubber, pesticides, and dyes, as well as some medical and consumer products. The “Report on Carcinogens,” now in its 13th edition, includes 243 listings.
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