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Antiestrogens, such as clomiphene and tamoxifen, initiate and maintain spermatogenesis by increasing endogenous levels of follicle-stimulating hormone, luteinizing hormone and testosterone.27 Treatment of idiopathic oligozoospermia by tamoxifen combined with TU can effectively improve sperm parameters and showed higher efficacy than when tamoxifen was used alone.28 Apart from tamoxifen and clomiphene, no other drugs have been approved and recommended for the treatment of male infertility. After surgery for treatment of hormone receptor-positive breast cancer, hormone therapy can be given to reduce the risk of the cancer coming back. Research using combination drug therapy has demonstrated, in randomized, controlled trials with adequate courses, sample sizes and well-designed protocols, that patients may benefit from treatment with antiestrogens, levocarnitine, antioxidants and combinations of these drugs.18 Although mono-medicine treatment is not recommended for male infertility, combination therapy with androgens shows promising prospects. Postmenopausal women with HR-positive breast cancer who cannot take chemotherapy or who cannot have surgery right away may receive hormone therapy with aromatase inhibitors before surgery (neoadjuvant therapy). Learn about tamoxifen, a hormone therapy for breast cancer, including how it works, how it’s taken and possible side effects.
Always check with your treatment team or pharmacist if you’re taking any other medicines with tamoxifen. If you have had blood clots in the past or are at risk of developing them, your treatment team will take this into account and may recommend an alternative to tamoxifen. Men can have similar side effects as women, such as hot flushes and headaches. It’s a very common side effect of tamoxifen and may last for weeks or months even if your treatment has finished. However, tamoxifen may slightly increase the risk of osteoporosis for premenopausal women.
If you have metastatic or recurrent HR-positive breast cancer, the type of hormone therapy you receive will depend on many factors. Several types of hormone therapy are approved to treat metastatic HR-positive breast cancer. You may receive hormone therapy if the cells in your breast cancer contain proteins called hormone receptors. Pre-menopausal women should not take an AI alone for breast cancer treatment because it is unsafe and can increase hormone levels. Because estrogen stimulates hormone receptor-positive breast cancers to grow, lowering the estrogen level can help slow the cancer’s growth or help prevent it from coming back. Fulvestrant (Faslodex) can be used to treat metastatic breast cancer, most often after other hormone drugs (like tamoxifen and often an aromatase inhibitor) have stopped working. Several types of hormone therapy can be used to treat breast cancer in women.
Once you finish your treatment your liver will usually go back to normal. If you notice any changes to your vision, tell your GP or treatment team. A small number of women notice an increase in downy facial hair. It will usually grow back once you’ve stopped taking the treatment. You may notice some hair loss or hair thinning while taking tamoxifen. If you have any unexpected vaginal bleeding or pain, tell your GP or treatment team. Your pharmacist, GP or treatment team can tell you what products you can use on your skin to help.
Folkman discovered in the 1970s that angiogenesis – the growth of new blood vessels – plays a significant role in the development of cancer. Tamoxifen did eventually receive marketing approval as a fertility treatment, but the class of compounds never proved useful in human contraception. It was there in 1962 that chemist Dora Richardson first synthesized tamoxifen, back then known as ICI-46,474, when she was looking to create triphenylethylene derivatives for the contraceptive pill project that her team was researching. In the late 1950s, pharmaceutical companies were actively researching a newly discovered class of anti-estrogen compounds in the hope of developing a morning-after contraceptive pill.