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Toremifene, Nonsteroidal Antiestrogens,
Fareston is a non-steroid antiestrogen mainly applied to treat metastatic breast cancer in postmenopausal women with estrogen-receptor positive or unknown tumors. Fareston also relieve triglyceride increasing caused by hormonotherapy. As CYP2D6 enzyme is not involved in its metabolic process, it is more suitable for Chinese patient who is with higher mutation rate of CYP2D6 enzyme .