NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,780 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.

theaflavin
(thee-uh-FLAY-vin)
A substance formed when green tea is fermented to make black tea. It is being studied in the treatment of cancer and other conditions, such as high cholesterol. It is a type of antioxidant.