NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,861 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.

cancer cluster
(KAN-ser KLUS-ter)
The occurrence of a larger-than-expected number of cases of cancer within a group of people in a geographic area over a period of time.