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Questions About Cancer? 1-800-4-CANCER

NCI Dictionary of Cancer Terms

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cancer of unknown primary origin  listen  (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.