Metastatic brain cancer (also called advanced or secondary brain cancer) occurs when cancer cells spread to the brain from other parts of the body. This is different from primary brain cancer, which is a cancer that starts in the brain.
Brain metastases occur in approximately 20-40% of people with cancer, with over half of those people developing more than one metastasis (or tumour).
Any cancer can spread to the brain. However, the most common cancers that spread to the brain are lung, melanoma, breast, kidney and bowel cancers.