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Agents Classified by the IARC Monographs, Volumes 1–127

Group 1 Carcinogenic to humans 121 agents
Group 2A Probably carcinogenic to humans  88 agents
Group 2B Possibly carcinogenic to humans 313 agents
Group 3 Not classifiable as to its carcinogenicity to humans 499 agents

For definitions of these groups, please see the Preamble.

It is strongly recommended to consult the complete Monographs on these agents, the publication date, and the list of studies considered.  Significant new information might support a different classification.
For agents that have not been classified, no determination of non-carcinogenicity or overall safety should be inferred.

See Preventable Exposures Associated With Human Cancers (Cogliano et al., 2011)

Although care was taken in preparing these lists, mistakes may be present.

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Last update: 27 October 2020