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Ovarian stimulation with the aromatase inhibitor letrozole has been proposed for ovulation induction in order to treat unexplained female infertility. In a multi-center study funded by the National Institute of Child Health and Development, ovarian stimulation with letrozole resulted in a significantly lower frequency of multiple gestation (i.e., twins or triplets) but also a lower frequency ...
Among all aromatase inhibitors, Letrozole is commonly used for improving female fertility. It works by inhibiting aromatase which is an enzyme that catalyses the conversion of androstenedione and testosterone to estrogen by hydroxylation. Hence, Letrozole inhibits the synthesis of estrogen. [18]
Letrozole is an orally active, nonsteroidal, selective aromatase inhibitor and hence an antiestrogen. It prevents aromatase from producing estrogens by competitive, reversible binding to the heme of its cytochrome P450 unit. The action is specific, and letrozole does not reduce production of corticosteroids. [citation needed
1,4,6-Androstatriene-3,17-dione (ATD) is a potent irreversible aromatase inhibitor that inhibits estrogen biosynthesis by permanently binding and inactivating aromatase in adipose and peripheral tissue. [1] It is used to control estrogen synthesis. [2]
For pelvic pain associated with endometriosis, combined oral contraceptive pills are considered a first-line medical treatment, along with NSAIDs, GnRH agonists, and aromatase inhibitors. [72] Combined oral contraceptive pills work to suppress the growth of the extra-uterine endometrial tissue. This works to lessen its inflammatory effects. [37]
Aromatase inhibitors, which stop the production of estrogen in postmenopausal women, have become useful in the management of patients with breast cancer whose lesion was found to be estrogen receptor positive. [33] Inhibitors that are in current clinical use include anastrozole, exemestane, and letrozole.
Antiestrogens inhibit the effects of estrogen, which include selective estrogen receptor modulators and aromatase inhibitors. Hypothalamic–pituitary–gonadal axis in females, with estrogen exerting mainly negative feedback on FSH secretion from the pituitary gland .
Although aromatase inhibitors and antigonadotropins can be considered antiestrogens by some definitions, they are often treated as distinct classes. [9] Aromatase inhibitors and antigonadotropins reduce the production of estrogen, while the term "antiestrogen" is often reserved for agents reducing the response to estrogen. [10]
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