Hormone Therapy Hormone Therapy Hormone therapy is a systemic therapy that uses hormones to keep cancer cells from growing. Breast cancers that are hormone-dependent are sensitive to estrogen. Estrogen binds to these breast cancer cells and stimulates them to grow and divide.
Hormone therapy prevents the binding of estrogen to cancer cells.
Hormone therapy can include surgery to remove the ovaries, radiation to destroy the normal functioning of the ovaries, or using drugs that block the body's hormones.