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What does it mean for a substance or activity to be included in Group 2B of the list of carcinogens?

When the International Agency for Research on Cancer (IARC) evaluates compounds or physical factors based on existing scientific evidence about the possibility of causing cancer, it can classify it into four groups. One of them, group 2B, implies that it is "Possibly carcinogenic to humans" . In other words, there is some evidence that it can cause cancer in humans, but at the moment it is far from conclusive.

In this group, in addition to the recent inclusion of mobile phones, are lead, the pesticide DDT , working in a printing press , coffee , gasoline and diesel, working dry cleaning in a dry cleaner, the use of talcum powder , potassium bromide (used in the 19th century as an anticonvulsant and now prohibited), the profession of firefighter, drugs such as Oxazepam (a benzodiazepine), naphthalene that we use to fight moths, working in a carpentry , some papilloma viruses …

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