A panel of experts from the International Agency for Research on Cancer (IARC), a division of the World Health Organization (WHO), noted the carcinogenic risk of “2-mercaptobenzimidazole” (MBT) used in the manufacture of rubber and decided to classify it as a “probable carcinogen”, on the same level as The decision to list MBT as a “probable carcinogen” is on the same level as the earlier inclusion of “red meat”. As MBT is used in the manufacture of condoms, rubber insoles, rubber bands, baby pacifiers and rubber gloves, etc., the concern group urged consumers to pay attention when buying related products. IARC’s 24 experts from eight countries reviewed relevant research data and found that MBT can cause cancer in animals. A number of employees at a chemical plant in Wales suffered from bladder, bowel and blood cancers, but because workers were also exposed to other chemicals, it was not determined whether MBT was directly related. However, it was suggested that MBT is likely to be harmful to humans and decided to be listed as a carcinogen second only to cigarettes and asbestos.