A substance or agent capable of causing or producing cancer in mammals, including humans. A chemical is considered to be a carcinogen if: 1. It has been evaluated by the International Agency for Research on Cancer (IARC) and found to be a carcinogen or potential carcinogen 2. It is listed as a carcinogen or potential carcinogen in the Annual Report on Carcinogens published by the National Toxicology Program (NTP) (latest edition) 3. It is regulated by OSHA as a carcinogen.