NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,894 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 promotion
(TOO-mer proh-MOH-shun)
A process in which existing tumors are stimulated to grow. Tumor promoters are not able to cause tumors to form.