Abstract
The “receptor conversion phenomenon” is a well-documented event during metastatic progression of breast cancer (BC), which result in Hormone Receptor and Human Epidermal Growth Factor Receptor 2 (HER2) status discordance between primary tumor and metastatic site. This phenotypic switch, related to tumor heterogeneity and/or change in cancer biology, may influence treatment plan in metastatic setting. Our retrospective analysis aimed to assess receptor status changes and their therapeutic and prognostic implications in a real word population.
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