NCI Dictionary of Cancer Terms
The NCI Dictionary of Cancer Terms features 8,385 terms related to cancer and medicine.
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- free radical
- listen (free RA-dih-kul)
- A type of unstable molecule that is made during normal cell metabolism (chemical changes that take place in a cell). Free radicals can build up in cells and cause damage to other molecules, such as DNA, lipids, and proteins. This damage may increase the risk of cancer and other diseases.