Estrogen Receptor Positive by Immunohistochemistry 1-9 Percent

**Semantic type:** Laboratory or Test Result

**Definition:** An immunohistochemical staining finding indicating that between 1 and 9 percent of the cells in a tissue sample are expressing estrogen receptor.

**Synonyms:** - ER Positive by Immunohistochemistry 1-9 Percent - ESR1 Positive by Immunohistochemistry 1-9 Percent