1 Definition of CUP

Meaning of CUP: 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.

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 cancer of unknown primary origin and carcinoma of unknown primary.

For learning, not diagnosis. This glossary provides general educational information and is not a substitute for advice from a qualified healthcare professional. If you may be experiencing a medical emergency, contact local emergency services.