Antiestrogen. Definition

Medical Definition: Antiestrogen

A substance that prevents cells from making or using estrogen (a hormone that plays a role in the formation of female sexual characteristics, menstrual cycle and pregnancy). Antiestrogens may stop the growth of some cancer cells, and are used to prevent and treat breast cancer. They are also being studied in the treatment of other cancers. An antiestrogen is a type of hormone antagonist.

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