NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 8,208 terms related to cancer and medicine.

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cancer of unknown primary origin
(KAN-ser ... UN-none PRY-mayr-ee OR-ih-jin)
A case in which cancer cells are found in the body, but the place where the cells first started growing (the origin or primary site) cannot be determined. Also called carcinoma of unknown primary and CUP.