Agents Classified by the IARC Monographs, Volumes 1–123

Group 1 Carcinogenic to humans 120 agents
Group 2A Probably carcinogenic to humans   82
Group 2B         Possibly carcinogenic to humans 311
Group 3 Not classifiable as to its carcinogenicity to humans             499
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.



  • French version of the List of classifications by cancer site, as hosted by Centre Léon Bérard

See Preventable Exposures Associated With Human Cancers (Cogliano et al., 2011)
Although care was taken in preparing these lists, mistakes may be present.
If you find an error, please notify us at imo@iarc.fr.

Last update: 9 November 2018