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Endocrine therapy is also known as hormone therapy. Unlike hormone replacement therapy (also known as HRT) however, which provides additional hormones, endocrine therapy for breast cancer blocks or prevents the production of these hormones, so has the opposite effect to HRT.

There are several different types of endocrine therapy used to treat and prevent breast cancer.

One of the most common types of endocrine therapy used are tablets known as aromatase inhibitors (AIs).