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Tamoxifen is a selective estrogen receptor modulator (SERM). [48] Even though it is an antagonist in breast tissue it acts as partial agonist on the endometrium and has been linked to endometrial cancer in some women. Therefore, endometrial changes, including cancer, are among tamoxifen's side effects. [49]
Tamoxifen is more promiscuous than raloxifene in target sites because of the relationship between ER's amino acid in Asp-351 and the antiestrogenic side chain of the SERM. The side chain for tamoxifen cannot neutralize Asp-351, so the site allosterically influences AF-1 at the proximal end of the ER. This issue is mended with the second ...
Endoxifen, also known as 4-hydroxy-N-desmethyltamoxifen, is a nonsteroidal selective estrogen receptor modulator (SERM) of the triphenylethylene group as well as a protein kinase C (PKC) inhibitor. It is under development for the treatment of estrogen receptor-positive breast cancer and for the treatment of mania in bipolar disorder.
Tamoxifen is currently first-line treatment for nearly all pre-menopausal women with hormone receptor-positive breast cancer. [1] Raloxifene is another partial agonist SERM which does not seem to promote endometrial cancer , and is used primarily for chemoprevention of breast cancer in high-risk individuals, as well as to prevent osteoporosis ...
Tamoxifen is also thought to lower the risk of breast cancer in those who have a predisposition or at risk. [9] Tamoxifen may be used in pre and postmenopausal women. [10] Toremifene is a similar SERM drug to tamoxifen, but is less common and only approved for treatment of metastatic cancer. Toremifene is generally prescribed once tamoxifen is ...
Sivifene (A-007) was initially thought to be a SERM due to its structural similarity to tamoxifen but it was subsequently found not to bind to the estrogen receptor (ER). [8] Tesmilifene (DPPE; YMB-1002, BMS-217380-01) is also structurally related to tamoxifen but similarly does not bind to the ER and is not a SERM. [9] [10]
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.
The side effects of toremifene are similar to those of tamoxifen. [5] The most common side effect is hot flashes. [5] Other side effects include sweating, nausea, vomiting, dizziness, vaginal discharge, and vaginal bleeding. [5] [7] In women with bone metastases, hypercalcemia may occur. [5] Toremifene has a small risk of thromboembolic events. [5]