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Tamoxifen inhibits the effects of estrogen in breast tissue while acting like estrogen in the uterus and bone. Tamoxifen is an estrogen blocker. It is a type of medicine used to treat breast cancer. Estrogen is a hormone that can promote the growth of certain types of breast cancers. Tamoxifen works by inhibiting the effects of estrogen in the body. This may help to halt or stop the growth of cancer cells. Tamoxifen is commonly prescribed for women with hormone receptor-positive breast cancer. This suggests that cancer cells include receptors that can bind to estrogen. Tamoxifen, which blocks the actions of estrogen, can help to prevent cancer from spreading or recurring. Tamoxifen acts by attaching to estrogen receptors on cancer cells, preventing estrogen from binding to those receptors. This prevents cancer cells from receiving the signals needed to grow and divide. It is essential to understand that tamoxifen is not the same as other estrogen blockers, such as aromatase inhibitors. Aromatase inhibitors act by inhibiting the production of estrogen in the body, whereas tamoxifen prevents estrogen from attaching to cancer cells.
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