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What Does It Mean When Something Is

What Does It Mean When Something Is "Probably Carcinogenic"?

News outlets have spent years covering carcinogens, claiming that everything from oral sex to soup will cause cancer. What doesn’t get touched on as often are the different classifications of carcinogens, leaving some people confused at the difference between a “probable” carcinogen and a “possible” carcinogen.

The International Agency for Research on Cancer (IARC) is an intergovernmental agency and forms part of the World Health Organization (WHO) of the United Nations. Last updated in 2015, it is the most widely used system for classifying carcinogens, and has evaluated the carcinogenic potential of more than 900 likely substances, placing them into one of five groups:

  • Group 1: Definitely carcinogenic to humans. Some examples include arsenic, asbestos, Hepatitis B, Hepatitis C, Plutonium, processed meat, and Ultraviolet Radiation.
  • Group 2A: Probably carcinogenic to humans. There isn’t enough evidence to definitively conclude that these substances cause cancer, but there’s enough to warrant the warning label. Some examples include anabolic steroids, diethyl sulfate (used to manufacture dyes and textiles), glyphosate (brought to market by Monsanto as “Roundup”), phenacetin (a pain-relieving and fever-reducing drug), and trichloroethylene (a volatile anesthetic).
  • Group 2B: Possibly carcinogenic to humans. There isn’t enough evidence to place it in Group 2A, but there’s enough to warrant the warning label. Some examples include chloroform, lead, naphthalene (the main ingredient in traditional mothballs), phenytoin (also known as Dilantin), and titanium dioxide (used in everything from sunscreen to paint).
  • Group 3: Cannot be classified as a carcinogen. There isn’t enough evidence to place it in a higher group, but there’s just enough evidence to keep it out of Group 4. Some examples include caffeine, cholesterol, fluorides, hydrogen peroxide, and talc.
  • Group 4: Probably doesn’t cause cancer. Evidence could change the classification of a substance in Group 4, but the evidence suggests that exposure to these substances will not cause cancer. The only substance in this group is caprolactam (the precursor to Nylon 6, a widely used synthetic polymer).

The American Cancer Society uses information from the IARC as well as the U.S. National Toxicology Program (NTP) to compile their list of probable and known carcinogens. Unlike the IARC, the NTP only classifies carcinogens in two groups. Its list was last updated in 2011.

  • Known to be a human carcinogen. This group is noticeably smaller than the IARC’s Group A, but contains many of the same substances.
  • Reasonably anticipated to be a human carcinogen. This group is comparable in size to the IARC’s and contains many of the same substances, but doesn’t include some notable substances like glyphosate (Roundup).

If you have been diagnosed with cancer after being exposed to a potentially carcinogenic substance and are in need of legal counsel, our lawyers at Domina Law Group have been representing victims in Nebraska since 1982. Contact us today for a case evaluation.

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