How does tamoxifen work

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  1. Pashtet Moderator

    How does tamoxifen work


    In the last three decades, thousands of women with breast cancer have taken the drug tamoxifen, only to discover that the therapy doesn’t work, either because their tumors do not respond to the treatment at all, or because they develop resistance to it over time. Now researchers at the University of California, San Francisco (UCSF) have discovered the molecular basis for tamoxifen resistance and found a potential way to defeat it. 13, 2011, at the AACR-NCI-EORTC International Conference: Molecular Targets and Cancer Therapeutics, UCSF oncologist Pamela Munster, MD, and her colleagues will present the results of clinical studies and laboratory experiments that show how some tumors resist tamoxifen and how this resistance can be overcome by administering a second class of drugs.“Understanding the mechanism of tamoxifen resistance and how to defeat it may help a large number of women with hormone-resistant breast cancer,” said Munster. “It may lead quickly to new, more effective treatment strategies and may help to identify biomarkers to help to gauge whether or not someone will respond to treatment in the first place.”The results will be presented at a press conference at a.m. (PST) in room 2004 of the Moscone Convention Center in San Francisco. The National Cancer Institute estimates that more than 200,000 Americans are diagnosed with breast cancer every year. It is the second leading cause of cancer death among American women, claiming more than 40,000 lives in 2009 alone. About 65 percent of women with breast cancer have tumors that, when examined in biopsies, show signs of co-opting a naturally occurring molecule in the human body called the estrogen receptor. In 2006, the large STAR clinical study concluded that raloxifene is equally effective in reducing the incidence of breast cancer, but after an average 4-year follow-up, although the difference was not statistically significant, there were 36% fewer uterine cancers and 29% fewer blood clots in women taking raloxifene than in women taking tamoxifen. Tamoxifen improves fertility in males with infertility by disinhibiting the hypothalamic–pituitary–gonadal axis (HPG axis) via ER antagonism and thereby increasing the secretion of luteinizing hormone (LH) and follicle-stimulating hormone (FSH) and increasing testicular testosterone production. It is taken as a preventative measure in small doses, or used at the onset of any symptoms such as nipple soreness or sensitivity. Other drugs are taken for similar purposes such as clomifene and the anti-aromatase drugs which are used in order to try to avoid the hormone-related adverse effects. Occasionally tamoxifen is used in treatment of the rare conditions of retroperitoneal fibrosis A report in September 2009 from Health and Human Services' Agency for Healthcare Research and Quality suggests that tamoxifen, raloxifene, and tibolone used to treat breast cancer significantly reduce invasive breast cancer in midlife and older women, but also increase the risk of adverse side effects. Some cases of lower-limb lymphedema have been associated with the use of tamoxifen, due to the blood clots and deep vein thrombosis (DVT) that can be caused by this medication. Resolution of the blood clots or DVT is needed before lymphedema treatment can be initiated.

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    SWOG-8814 Tamoxifen With or Without Combination Chemotherapy in Postmenopausal Women Who Have Undergone Surgery for Breast Cancer Fish oil boosts responses to breast cancer drug tamoxifen, researchers find Date April 8, 2011 Source Fox Chase Cancer Center Summary Breast cancer Tamoxifen is an antineoplastic nonsteroidal selective estrogen receptor modulator SERM. Tamoxifen competitively inhibits the binding of estradiol to estrogen receptors, thereby preventing the receptor from binding to the estrogen-response element on DNA. The result is a reduction in DNA synthesis and cellular response to estrogen.

    Tamoxifen won't work on hormone-receptor-negative breast cancer. Tamoxifen is available in two forms: a pill taken once a day (brand name: Nolvadex) or a liquid form (brand name: Soltamox). If you dislike pills or you're having trouble swallowing tamoxifen pills, Soltamox can help make it easier to stay on your treatment plan. Most doctors recommend taking tamoxifen at the same time each day. — while you are taking tamoxifen and for 2 months afterward. You should not take tamoxifen if you are breastfeeding, pregnant, trying to get pregnant, or if there is any chance that you could be pregnant. You should use an effective non-hormonal type of birth control — such as condoms, a diaphragm along with spermicide, or a non-hormonal I. Ask your doctor which type of non-hormonal birth control would be best for you. Since its approval in 1998, tamoxifen has been used to treat millions of women and men diagnosed with hormone-receptor-positive breast cancer. While an aromatase inhibitor is the first hormonal therapy medicine choice for postmenopausal women, tamoxifen is the first choice for premenopausal women and is still a good choice for postmenopausal women who can't take an aromatase inhibitor. side effect of tamoxifen is blood clots, including deep vein thrombosis (DVT) and pulmonary embolus. In some cases, health care professionals may use the trade name Nolvadex when referring to the generic drug name tamoxifen. This medication is classified as an "anti-estrogen." (For more detail, see "How this drug works" section below). You should seek emergency help and notify your health care provider immediately if you develop sudden chest pain and shortness of breath. Notify your health care provider within 24 hours if you notice that one leg is swollen, red, painful and/or warm to touch and the other is not. A side effect of tamoxifen can be the development of uterine cancer. Women who have not had a hysterectomy should have regular pap smears and gyn examinations. Abnormal vaginal bleeding should be reported to your health care provider.

    How does tamoxifen work

    Scientists Discover Mechanism for Tamoxifen Resistance and How., Fish oil boosts responses to breast cancer drug tamoxifen.

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  5. THURSDAY, Dec. 6, 2018 HealthDay News -- Tamoxifen is considered a vital weapon in the fight against breast cancer, but many women who have to take the drug struggle with its significant side.

    • Lower-Dose Tamoxifen Works As Well As High-Dose.
    • Tamoxifen C26H29NO - PubChem.
    • Jill Goodacre Is Stopping Tamoxifen What to Know About..

    Tamoxifen Nolvadex hormone therapy side effects, how it's given, how it works, precautions and self care tips for treatment of breast cancer. If you miss a dose, do not take a double dose the next day. The amount of tamoxifen that you will. Tamoxifen is an "anti-estrogen" and works by competing with estrogen to bind to estrogen receptors in breast cancer cells. Tamoxifen is formally known as a selective estrogen receptor modulator SERM. By blocking estrogen in the breast, tamoxifen helps slow the growth and reproduction of breast cancer cells. How does tamoxifen work? Scientists aren’t sure exactly how the drug works. But they do know that some breast cancer cells are sensitive to estrogen. They need it to grow and spread.

     
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