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Home >Information for Patients > Dictionary Index

Dictionary of Cancer Terms

View in Spanish: RE-

ER-
Describes cells that do not have a protein to which the hormone estrogen will bind. Cancer cells that are ER- do not need estrogen to grow, and usually do not stop growing when treated with hormones that block estrogen from binding. Also called estrogen receptor negative.



 
 
Source: National Cancer Institute Dictionary of Cancer Terms, available at www.cancer.gov/dictionary.