Invasive ductal carcinoma, well differentiated, high power, ER positive. Digital Atlas of Breast Pathology by Meenakshi Singh, MD - Department of Pathology, Stony Brook University Medical Center

Invasive ductal carcinoma, CHG 1 of 3, high power, ER positive.
The percent of tumor cells positive for estrogen receptor is estimated with immunohistochemical stains and correlates with clinical response to hormone therapy (i.e., tamoxifen). Progesterone receptors are graded in a similar manner.

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