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Cancer of unknown primary (CUP)

Men and woman discussing unknown primary cancer

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

More information

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

Join our forum

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: 20 August 2014