A carcinogen is defined as any substance that can cause or aggravate cancer.
The International Agency for Research on Cancer assigns carcinogens a rating by grouping them into one the following five standard classifications: Group 1: The agent is carcinogenic to humans.Group 2A: The agent is probably carcinogenic to humans.Group 2B: The agent is possibly carcinogenic to humans.Group 3: The agent is not classifiable as to its carcinogenicity to humans.Group 4: The agent is probably not carcinogenic to humans.See also: Cancer
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