ER+

Definition / meaning of ER+

Describes cells that have a receptor protein that binds the hormone estrogen. Cancer cells that are ER+ may need estrogen to grow, and may stop growing or die when treated with substances that block the binding and actions of estrogen. Also called estrogen receptor positive.

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Find More About 'ER+'

Source(s):

The Web site of the National Cancer Institute (http://www.cancer.gov/)

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