Estrogen Receptor Positive by Immunohistochemistry Greater than or Equal to 10 Percent

**Semantic type:** Laboratory or Test Result

**Definition:** An immunohistochemical staining finding indicating that greater than or equal to 10 percent of the cells in a sample are expressing estrogen receptor.

**Synonyms:** - ER >=10% by IHC - Estrogen Receptor Positive by Immunohistochemistry Greater than or Equal to 10%