In that case, the cancer risk was shown to have been overstated, but still present, and the substance remains classified a "probable human carcinogen."

Half a dozen state, federal, and international agencies now classify trichloroethylene as a probable carcinogen.

They said alachlor was "a probable human carcinogen" that had contaminated ground and surface water in the Midwest.

Acetaldehyde is a probable or possible carcinogen in humans.

And Monsanto argued that the product should not be labeled a probable human carcinogen.

The entire mechanism was judged irrelevant to human health, and the chemical is now not viewed as a probable carcinogen.

The gas phase of secondhand smoke contains at least 16 known or probable carcinogens.

The environmental agency says they are a probable carcinogen, though that has never been proved in humans.

Fungicides are commonly classified as possible or probable carcinogens in animal studies.

Epichlorohydrin is classified by several international health research agencies and groups as a probable or likely human carcinogen in humans.