Fulvestrant is a hormonal therapy drug. It is used to treat advanced breast cancer.
Hormones are substances produced naturally in your body. They act as chemical messengers and help control the activity of cells and organs. Hormonal therapies are drugs that affect how hormones are made or how they work in the body.
Many breast cancers need the hormone oestrogen to grow. This is called oestrogen-receptor positive (ER positive) breast cancer. These cancers have receptors (proteins) on the breast cancer cells. The receptors let hormones, such as oestrogen, attach to the cell.
Fulvestrant blocks the receptors and stops oestrogen reaching the cancer cells. This slows down or stops the cancer cells from growing. Fulvestrant also reduces the number of receptors on the breast cancer cells.