|Group 1||Carcinogenic to humans||120 agents|
|Group 2A||Probably carcinogenic to humans||82|
|Group 2B||Possibly carcinogenic to humans||302|
|Group 3||Not classifiable as to its carcinogenicity to humans||501|
|Group 4||Probably not carcinogenic to humans||1|
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)|
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Last update: 29 June 2018