Hormones are circulating substances produced by different glands of the body, and they can cause some breast cancers to grow. If tests show that a woman’s cancer is sensitive to the action of hormones, she may benefit from treatments that reduce their effect. Tamoxifen®, for example, is a medication that blocks the effects of the hormone estrogen and is commonly used in the treatment of breast cancer. Arimidex® is another commonly used hormonal therapy for breast cancer. Your breast surgeon and oncologist will determine if hormone therapy may be effective. In most situations, the need for hormone therapy does not affect whether a woman is a candidate for breast reconstruction surgery.