Abstract:Background: Up to 10% of total breast cancers are positive for both hormone receptor [HR: estrogen receptor (ER) and/or progesterone receptor (PR)] and HER2. These patients belong mainly to the luminal B subtype, which exhibits resistance to endocrine therapy. Currently, systemic treatment for HR+/HER2+ breast cancer patients involves a combination of chemotherapy and HER2-directed therapy. While these therapies improve outcomes, they are associated with pernicious side effects.
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