Hormone (endocrine) therapy is a treatment for cancers that are stimulated by hormones. These therapies work by blocking the effects of hormones or lowering the levels of hormones in the body. This causes the hormone-sensitive cancer cells to die or stop growing.
Endocrine therapy is commonly used to treat certain types of breast cancers that are found to be estrogen receptor (ER) or progesterone receptor (PR) positive. Endocrine therapy can also be used for prevention of breast cancer in women who are at higher risk. Most prostate cancers rely on hormones to grow and therefore endocrine therapy can often be used for treatment.