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. Author manuscript; available in PMC: 2011 Apr 13.
Published in final edited form as: Hum Mutat. 2008 Nov;29(11):1282–1291. doi: 10.1002/humu.20880

Table 2.

IARC (International Agency for Cancer Research) Classification of Carcinogens

Group Description
1 The agent is carcinogenic to humans
2A The agent is probably carcinogenic to humans
2B The agent is possibly carcinogenic to humans
3 The agent is not classifiable as to its carcinogenicity to humans
4 The agent is probably not carcinogenic to humans