National Toxicology Program

National Toxicology Program

13th Report on Carcinogens (RoC)

13th Report on Carcinogens U.S. Department of Health and Human Services Secretary Sylvia M. Burwell released the 13th Report on Carcinogens on October 2, 2014. (Press Release) (Federal Register notice PDF HTML)

The Report on Carcinogens (RoC) is a congressionally mandated, science-based, public health document that the NTP prepared for the HHS Secretary.

The report identifies agents, substances, mixtures, and exposure circumstances that are known or reasonably anticipated to cause cancer in humans.

Official Citation: NTP (National Toxicology Program). 2014. Report on Carcinogens, Thirteenth Edition. Research Triangle Park, NC: U.S. Department of Health and Human Services, Public Health Service.

Read Questions and Answers About the 13th RoC and a Fact Sheet on the 13th RoC (301 KB) for more information on carcinogens and their impact on your health.

New Listings


Pentachlorophenol and By-products of Its Synthesis


RoC Table of Contents

The Report on Carcinogens is a cumulative report that includes 243 listings since 1980. This 13th Report replaces previous editions.

Search the RoC

You can search for a substance, tumor site, nomination, or process

Note on Accessibility: Persons with disabilities or using assistive technology may find some documents are not fully accessible. For assistance, contact us by emailing Central Data Management (or calling 919-541-3419) and identify the documents/pages for which access is required. We will assist you in accessing the content of these files. The NIEHS has helpful information on accessibility.

NTP is located at the National Institute of Environmental Health Sciences, part of the National Institutes of Health.