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Hormonal therapy keeps cancer cells from getting the natural hormones (estrogen and progesterone) they need to grow. If lab tests show that the breast tumor has hormone receptors, the woman may have hormonal therapy. Like chemotherapy, hormonal therapy can affect cells throughout the body.
This treatment may be a medicine or surgery:
- Medicine: The doctor may suggest a drug that can block the natural hormone. One example is tamoxifen, which blocks estrogen. Another type (aromatase inhibitor) prevents the body from making the female hormone estradiol, a form of estrogen.
- Surgery: If a woman has not gone through menopause, she may have surgery to remove her ovaries. The ovaries are the main source of the body's estrogen. (After menopause, hormone production by the ovaries naturally declines so surgery would not be needed.)
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