IARC group 3 substances, chemical mixtures and exposure circumstances are those that can not be classified in regard to their carcinogenicity to humans by the International Agency for Research on Cancer (IARC). This category is used most commonly for agents, mixtures and exposure circumstances for which the level of evidence of carcinogenicity is inadequate in humans and inadequate or limited in experimental animals. Exceptionally, agents (mixtures) for which the evidence of carcinogenicity is inadequate in humans, but sufficient in experimental animals may be placed in this category when there is strong evidence that the mechanism of carcinogenicity in experimental animals does not operate in humans. Agents, mixtures and exposure circumstances that do not fall into any other group are also placed in this category. The IARC Monographs on which this list is based assess the hazard linked to the agents, they do not assess the cancer risk of the agents. The list is up-to-date as of January 2024.

Agents and groups of agents

A

B

C

D

E–G

H–L

M

N–O

P

Q–R

S

T

U–Z

Mixtures

Exposure circumstances