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SummaryBackground: Recent studies have shown that the expression status of hormone receptors and human epidermal growth factor receptor 2 (HER2) in breast cancer may change during disease progression. The aim of this study was to determine and compare the estrogen receptor (ER), progesterone receptor (PR), and HER2 expression status in primary breast cancer and metastatic lesions. Methods: 58 patients with registered biopsy reports or available samples of the primary tumor and distantdoi:10.6084/m9.figshare.5127133 fatcat:sucaq3qtfveajf6b65hgczudom