(see Metastasis): A cancer that has left its primary site and is deposited elsewhere in the body (eg lung, bone, brain).

A deposit of breast cancer away from the breast (such as in the lung, bone or lymph node). See metastasis.

Also known as metastesis, a secondary tumour is an extension of the primary tumour. It develops in a part of the body away from the original (primary) cancer. When cancer cells break away from the original tumour and are carried by the lymph and blood systems to other parts of the body they are said to metastasise. Even though the metastasis may be far away, it is not a new cancer: see cancer.