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Background Occult breast cancer (OBC) is rare and optimal local–regional (LR) management has not been defined. Using a patient registry database, we examine factors associated with treatment and outcomes in OBC. Methods Female patients with cT0 N1/2 M0 BC were selected from the National Cancer Database (2004–2013) and categorized into four treatment groups: MAST = mastectomy with axillary lymph...
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