How do we know if a chemical causes cancer?



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    Scientists use a number of tests to see if a chemical causes cancer, or is carcinogenic. Animal testing is the most predominant because cancer grows in live tissue and needs a live host to proliferate. Other tests involve in vitro testing, which translates to “under glass.” In vitro testing looks to see if chemicals damage individual cells under glass. Unfortunately, certain types of cancers don’t cause cell damage and would not be picked up by these tests.

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