Posted on December 5th, 2001 by
Growth of normal breast cells and some breast cancers are stimulated by estrogen. Estrogen receptors are molecules that function as cells "welcome mat" for estrogen circulating in the blood. Breast cancer cells without these receptors (called estrogen receptor negative or ER negative) are unlikely to respond to hormonal therapy. The estrogen receptor assay is a laboratory test done on a piece of cancer in order to see whether estrogen receptors are present.
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