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A 62-year-old female with right primary neuroendocrine carcinoma of the breast. Right breast core biopsy at 11 o’clock positive immunohistochemistry shown above includes the following: (A) E-cadherin, (B) ER, (C) PR, (D) synaptophysin, and (E) ki67. ER, estrogen receptor; PR, progesterone receptor.
