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Objective: Breast pathologies are very common in women. Breast cancer is the most common and most frequent cause of death in women. The most common type of breast cancer is invasive ductal carcinoma. Histopathological examination of the tissue taken with a fine needle aspiration biopsy or true-cut biopsy is the main diagnostic method when clinical examination of breast and/ or radiological mass is detected. The definitive diagnosis of benign and malignant lesions of the breast is important in the form of treatment. The most important features in the diagnosis of breast cancer are atypical cellular features such as invasion, desmoplasia, pleomorphism, hyperchromasia, nuclear irregularity, prominent nucleoli, high mitosis count. Loss of myoepithelial layer in the malignant cases is a very important feature in the diagnosis. Aim of this study is to evaluate the benign and malignant breast pathologies with the immunohistochemical panel. Material and Methods: 52 breast true-cut biopsy materials in the archives of Department of Pathology at Faculty of Medicine, Erzincan Binali Yildirim University between 2015-2017 were re-examined with the immunohistochemical panel. The immunohistochemical staining markers such as estrogen, progesterone, cerb-B2, E-cadherin, P63, CD10, calponin, CK5/6 have been applied in all cases. Results: 23 cases were a benign disease such as fibroadenoma, adenosis, fibrosis, fibrocystic changes, and intraductal papilloma. 29 cases were a malignant epithelial tumor. Conclusion: In the diagnosis of breast cancers, mainly cellular properties are determinative. The evaluation with the immunohistochemical panel will reduce the risk of diagnostic error when the cases that difficultly diagnosed with cellular properties.

Analysis of breast true-cut biopsies by applying immunohistochemical study of myoepithelial markers