| 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 |
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For definitions of these groups, please see the Preamble. |
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| 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. | ||
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The Preamble to the IARC Monographs describes the objective and scope of the programme, the scientific principles and procedures used in developing a Monograph, the types of evidence considered and the scientific criteria that guide the evaluations. The Preamble should be consulted when reading a Monograph or list of evaluations.
- Preventable Exposures Associated With Human Cancers (Cogliano et al., 2011)
IARC 2018
