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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 ...
Tamoxifen, sold under the brand name Nolvadex among others, is a selective estrogen receptor modulator used to prevent breast cancer in women and men. [13] It is also being studied for other types of cancer. [13] It has been used for Albright syndrome. [14] Tamoxifen is typically taken daily by mouth for five years for breast cancer. [14]
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]
Steroidal aromatase inhibitors are a class of drugs that are mostly used for treating breast cancer in postmenopausal women. High levels of estrogen in breast tissue increases the risk of developing breast cancer and the enzyme aromatase is considered to be a good therapeutic target when treating breast cancer due to it being involved in the final step of estrogen biosynthetic pathway and also ...
Antiestrogens include selective estrogen receptor modulators (SERMs) like tamoxifen, clomifene, and raloxifene, the ER silent antagonist and selective estrogen receptor degrader (SERD) fulvestrant, [6] [7] aromatase inhibitors (AIs) like anastrozole, and antigonadotropins including androgens/anabolic steroids, progestogens, and GnRH analogues.
Letrozole is an aromatase inhibitor that reduces estrogen production, which is necessary for tumor growth. Pritchard followed over 5,000 postmenopausal women who had taken tamoxifen for their breast cancer and treated them with either letrozole or a placebo. Letrozole treatment reduced the risk of breast cancer recurrence by over 40%.
Letrozole, sold under the brand name Femara among others, is an aromatase inhibitor medication that is used in the treatment of breast cancer for post-menopausal women. [1]It was patented in 1986 and approved for medical use in 1996. [4]
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 .