![](https://webarchive.library.unt.edu/eot2008/20081107045517im_/http://www.cancer.gov/images/spacer.gif) |
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(KEE-mo-pre-VEN-shun)
![](https://webarchive.library.unt.edu/eot2008/20081107045517im_/http://www.cancer.gov/images/spacer.gif)
| The use of drugs, vitamins, or other agents to try to reduce the risk of, or delay the development or recurrence of, cancer. |
Previous Definitions: | charged-particle radiation therapy, chelating agent, chemical imbalance, chemoembolization, chemoimmunotherapy | Next Definitions: | chemoprevention study, chemoprotective, chemoradiation, chemoradiotherapy, chemosensitivity |
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