![]() ![]() The lists do not include substances that have been classified as possible carcinogens, for which the evidence is not as strong. These lists include agents that have been classified as known or probable human carcinogens.These agencies tend to focus on substances and exposures most likely to cause cancer, but there are many others that have not been fully studied yet. These lists include only those agents that have been evaluated by the agencies.This can make it hard to find a particular substance on one or both of these lists. ![]() ![]() These lists are alphabetical, but many of the substances and exposures here can go by different names.Many known or suspected carcinogens appear on both organization’s lists however, if a substance or exposure is only on one agency’s list, this it does not necessarily mean there is a controversy, as one agency may not have evaluated it. To learn more about these agencies and how they study and classify cancer causes, see Determining if Something Is a Carcinogen. More information on each of these known and probable human carcinogens can be found on their websites. Instead, we rely on the determinations of other respected agencies, such as the International Agency for Research on Cancer (IARC, part of the World Health Organization) and the US National Toxicology Program (NTP). In general, the American Cancer Society does not determine if something causes cancer (that is, if it is a carcinogen). ![]()
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