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The National Toxicology Program (NTP) periodically published its Report on Carcinogens (RoC), which classifies chemicals as either "known to be a human carcinogen" or "reasonably anticipated to be a human carcinogen." The RoC is a congressionally mandated scientific and public health document that provides data on carcinogenicity, genotoxicity, and biologic mechanisms. The RoC evaluations are performed by scientists from the NTP, other Federal health research and regulatory agencies, and non-government institutions. The RoC review process includes external peer review and public comment. The EPA reviewed the 13th edition of the NTP RoC to identify those chemicals that are not currently on the Toxics Release Inventory (TRI) list and that have not previously been reviewed for listing. One chemical, 1-bromopropane, was identified as a candidate for addition to the TRI list.