The Fourteenth Edition of the Report on Carcinogens (2016), published by the National Toxicology Program of the U.S. Department of Health and Human Services, is a science-based public health document that identifies and discusses agents, substances, mixtures, or exposure circumstances that may pose a hazard to human health by virtue of their carcinogenicity. The 14th Report on Carcinogens now totals 248 entries.