Cancer of unknown primary (CUP) means that the cancer has already spread (metastasized) when it is found, but doctors do not know where it started (primary site). The metastatic tumour is found before the primary cancer is identified. The primary site may be identified after further testing, but the primary site is never found in many cases. CUP is also not a single type of cancer, but a group of different types of cancer. Cancer of unknown primary may also be called carcinoma of unknown primary site or occult primary cancer (Canadian Cancer Society Cancer Encyclopedia).
For additional information on cancer of unknown primary, please go to the Canadian Cancer Society Cancer Encyclopedia.
The Cancer of Unknown Primary Foundation provides information and support to CUP patients, their families and friends while raising awareness of this problem to stimulate action that will improve treatment.
CUP Foundation – Jo’s friends
Newbury, English RG20 7BZ