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Cancer of unknown primary (CUP)

Men and woman discussing unknown primary cancer

All about cancer of unknown primary (CUP), which means that cancer spread has been found somewhere in your body (secondary cancer), but your doctors can't find out where the cancer started (the primary cancer). CUP is sometimes called carcinoma of unknown primary, unknown primary cancer or unknown primary tumour. Information on causes, tests to diagnose cancer, treatment including radiotherapy, chemotherapy, hormone therapy and current research. Living with cancer of unknown primary covers coping with your diagnosis.

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You can also find cancer of unknown primary organisations providing help and support, a reading list and see where this information comes from.

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Did you know that Cancer Research UK has an online forum for people affected by cancer? Cancer Chat is your space to talk about cancer.

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Updated: 14 January 2014