tamoxifen
noun [ U ] medical specialized uk/təˈmɒk.sɪ.fen/ us/təˈmɑːk.səˌfen/
泰莫西芬（用于治疗乳腺癌药物）
a drug used to treat breast cancer by blocking the action of the hormone oestrogen
Pre-menopausal hormone treatments include tamoxifen. 绝经前激素治疗包括使用泰莫西芬。