Researchers study human cells in the laboratory to see whether certain chemicals might cause
changes that could lead to cancer.
These studies are often done to see if animal studies--which take longer and are more complex--
are actually needed. If a chemical does not cause cancer in laboratory cells, animal studies usually
aren't done.
![Laboratory Studies of Human Cells](https://webarchive.library.unt.edu/eot2008/20090510224937im_/http://www.cancer.gov/images/Documents/167a5f6c-1c75-4b8a-b1bc-c7520def8d6b/slide43.jpg)
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