NCI Dictionary of Cancer Terms
The NCI Dictionary of Cancer Terms features 7,777 terms related to cancer and medicine.
Browse the dictionary by selecting a letter of the alphabet or by entering a cancer-related word or phrase in the search box.
- tumor initiation
- listen (TOO-mer ih-NIH-shee-AY-shun)
- A process in which normal cells are changed so that they are able to form tumors. Substances that cause cancer can be tumor initiators.