A study looking at cancer cells and nucleic acid in the bloodstreams of women with breast cancer that has spread to other parts of the body (Detect)

This study is looking to find and study cancer cells and a substance containing gene (genetic) information called nucleic acid, in the bloodstream of women having treatment for breast cancer that has spread.

A cancer is made up of millions of cancer cells which form a tumour. Some cells may break away and spread to another part of the body, forming a new tumour. Breast cancer cells can spread from your original (primary) breast cancer to another part of your body in the bloodstream. This is called secondary breast cancer.