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Immunohistochemical staining of mucinous cystadenocarcinoma. The tumor cells are positive for cytekeratin 7 (A) and negative for cytokeratin 20 (B). The hormone receptors, estrogen receptor and progesterone receptor, are negative and the c-erbB2 is 2-positive (C). The tumor cells are positive for mucin (MUC) 1 (D) along the cytoplasmic membrane and negative for MUC2 (E). Mucin of the intracytoplasm and stroma reveal positivity for MUC5 (F).
