What is oestrogen receptor-positive (ER+) breast cancer?
There are many types of breast cancer. The most common type is called oestrogen receptor-positive (ER+) breast cancer.
This type of cancer is ‘hormone dependent’. This means that the tumour has oestrogen receptors and the hormone oestrogen is required for it to survive and grow. This means we can target this dependence of hormones with endocrine therapy to treat the cancer.