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Overview
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Beta‐catenin associates with the cytoplasmic portion of E‐ cadherin, which is necessary for the function of E‐cadherin as an adhesion molecule. In normal tissues, beta‐catenin is localizedto the membrane of epithelial cells, consistent with its role in the cell adhesion complex. In breast ductalneoplasia, beta‐catenin is usually localized in cellular membranes. However, in lobular neoplasia, a marked redistribution of beta‐catenin throughout the cytoplasm results in a diffuse cytoplasmic pattern. Immuno‐staining of beta‐catenin and E‐cadherin ishelps in theaccurate identification of ductal and lobular neoplasms, including a distinction between low‐grade ductal carcinoma in situ (DCIS) and lobular carcinoma. Additionally, some rectal and gastric adenocarcinomas demonstrate diffuse cytoplasmic beta‐ catenin staining and a lack of membranous staining, mimicking the staining pattern observed with lobular breast carcinomas.
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Overview