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medication that inhibits estrogen production to treat breast cancer

Letrozole, also known by the brand name Femara, is a medication primarily used to treat breast cancer in postmenopausal women. It works by inhibiting the enzyme aromatase, which decreases the production of estrogen, a hormone that can promote the growth of certain types of breast cancer. Additionally, letrozole is sometimes used off-label to treat conditions like polycystic ovary syndrome (PCOS) and to stimulate ovulation in women facing infertility issues.