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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 .
LHRH (luteinising hormone-releasing hormone) agonists block the production of sex hormones in both men and women. [16] In men, LHRH agonists seize testosterone production in the testicles, and in women it blocks the ovaries from producing estrogen and progesterone. [16] These drugs are most commonly used in treatments for prostate cancer. [16]
Aromatase is the enzyme that catalyzes a key aromatization step in the synthesis of estrogen. It converts the enone ring of androgen precursors such as testosterone, to a phenol, completing the synthesis of estrogen. As such, AIs are estrogen synthesis inhibitors. Because hormone-positive breast and ovarian cancers are dependent on estrogen for ...
Puberty blockers (also called puberty inhibitors or hormone blockers) are medicines used to postpone puberty in children. The most commonly used puberty blockers are gonadotropin-releasing hormone (GnRH) agonists, which suppress the natural production of sex hormones, such as androgens (e.g. testosterone) and estrogens (e.g. estradiol).
Women with breast cancer may stop hormone-suppressing treatment temporarily to have a baby, the first of its kind study finds.
By acting as an antiandrogen, as androgens can suppress both estrogen production and signaling (e.g., in the breasts). [29] [93] Inhibition of the conversion of estradiol to estrone, resulting in an increase in the ratio of circulating estradiol to estrone. [84]