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A 58-year-old female with left primary neuroendocrine carcinoma of the breast. Left breast core biopsy at 8 o’clock positive immunohistochemistry shown above include the following: (A) ER, (B) PR, (C) synaptophysin, (D) chromogranin, and (E) E-cadherin. ER, estrogen receptor; PR, progesterone receptor.
