Everyone reacts differently to drugs and some people will have more side effects than others. For younger women who are premenopausal, tamoxifen may be given alone or sometimes alongside treatment to stop the ovaries working (ovarian suppression). They may do some blood tests to check whether you’re postmenopausal before changing your hormone therapy. Also called metastases, advanced breast cancer, secondaries or stage 4 breast cancer. There are different types of breast cancer recurrence. Sometimes called pre-invasive, intraductal or non-invasive cancer. Whether you are prescribed tamoxifen will depend on a number of factors including the features of the DCIS and your medical history. Your treatment team will discuss whether they feel it would benefit you. Levels of tamoxifen in the uterus have been found to be 2- to 3-fold higher than in the circulation and in the breasts 10-fold higher than in the circulation. High concentrations of tamoxifen have been found in breast, uterus, liver, kidney, lung, pancreas, and ovary tissue in animals and humans. Peak levels of tamoxifen after a single 40 mg oral dose were 65 ng/mL and steady state levels at 20 mg/day were 310 ng/mL. Steady state levels of afimoxifene are achieved after 8 weeks of daily tamoxifen administration. Steady state levels of tamoxifen are reached typically after 3 to 4 weeks but possibly up to 16 weeks of daily administration. Following intake, peak levels of tamoxifen occur after three to seven hours. However, tamoxifen dose-dependently blocks amphetamine-mediated dopamine release and psychostimulant-like effects in animals. Use of tamoxifen has been shown to slightly increase risk of deep vein thrombosis, pulmonary embolism, and stroke. Research suggests that tamoxifen may activate PI3K signaling in uterine tissue as a non-genetic driver event, which could contribute to uterine carcinogenesis. Tamoxifen is useful in the treatment of peripheral precocious puberty, for instance due to McCune–Albright syndrome, in both girls and boys. In a double-blind crossover study, patients were given either a placebo or tamoxifen (10 mg orally twice daily) for one month, in random order. Some men with bone metastases (cancer spread to the bones) may have a tumor flare (the tumor getting bigger for a short time), which can cause bone pain. It is not likely to work if tamoxifen has already been used and has stopped working. Treatment longer than 5 years might be offered to men whose cancers have a higher chance of coming back. Hormone therapy is usually taken for at least 5 years. Sometimes it is started before surgery (as neoadjuvant therapy).
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