Estrogen Receptor Positive by Immunohistochemistry Less than or Equal to 9 Percent

**Semantic type:** Laboratory or Test Result

**Definition:** An immunohistochemical staining finding indicating that at most 9 percent of the cells in a tissue sample are expressing estrogen receptor.

**Synonyms:** - Estrogen Receptor Less than or Equal to 9 Percent Staining - Estrogen Receptor Less than or Equal to 9% Staining