NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,846 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.

nonfunctioning tumor
(non-FUNK-shuh-ning TOO-mer)
A tumor that is found in endocrine tissue but does not make extra hormones. Nonfunctioning tumors usually do not cause symptoms until they grow large or spread to other parts of the body. Also called endocrine-inactive tumor.