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Estrogen deprivation therapy, also known as endocrine therapy, is a form of hormone therapy that is used in the treatment of breast cancer.Modalities include antiestrogens or estrogen blockers such as selective estrogen receptor modulators (SERMs) such as tamoxifen, selective estrogen receptor degraders such as fulvestrant, and aromatase inhibitors such as anastrozole and ovariectomy.
Antiestrogens, also known as estrogen antagonists or estrogen blockers, are a class of drugs which prevent estrogens like estradiol from mediating their biological effects in the body. They act by blocking the estrogen receptor (ER) and/or inhibiting or suppressing estrogen production .
Tamoxifen is a SERM and is one of the most common and oldest forms of hormone therapy. [8] When breast cancer is found at an early stage or found to be Metastatic breast cancer, tamoxifen can be prescribed to selectively block estrogen's effect on certain cells. SERMs like tamoxifen attach to receptors on the cancer cells which blocks estrogen ...
Aromatase inhibitors (AIs) are a class of drugs used in the treatment of breast cancer in postmenopausal women and in men, [1] [2] and gynecomastia in men. They may also be used off-label to reduce estrogen conversion when supplementing testosterone exogenously. They may also be used for chemoprevention in women at high risk for breast cancer.
Moreover, breast cancer risk is heightened following use of the combined oral contraceptive pill and combined hormone replacement therapy. [4] Armed with this evidence that endogenous and exogenous changes in estrogen and progesterone levels modulate the risk of breast cancer, it is apparent that hormones can play a key role in breast cancer.
Aromatase inhibitors are an important class of drugs used for the treatment of breast cancer in postmenopausal women. At menopause, estrogen production in the ovaries ceases, but other tissues continue to produce estrogen through the action of the enzyme aromatase on androgens produced by the adrenal glands.
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