Alcohol and cancer
Alcohol as a carcinogen and co-carcinogen

After more epidemiological evidence connecting alcohol and cancers became available, the IARC reconvened in 2007. Based on epidemiological studies, which revealed cancer risk was independent of the type of alcohol, and animal studies, which showed increased cancer risk with exposure to ethanol alone, the group determined that the ethanol in alcoholic beverages was carcinogenic to humans. Alcohol was determined to increase the risk of developing breast cancer, liver cancer, colorectal cancer, esophageal cancers, pharyngeal cancer, laryngeal cancer, and oral cancer. In 2009, the group determined that acetaldehyde which is a metabolite of ethanol is also carcinogenic to humans.
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