Intrinsic Subtype Switching and Acquired ERBB2/HER2 Amplifications and Mutations in Breast Cancer Brain Metastases

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Abstract
Brain metastases (BrM) occur in 10% to 15% of patients with metastatic breast cancer (BrCa) and present a major clinical challenge, highlighted by a poor 8.5-month median overall survival.1 Limited therapeutic options exist for patients with BrM and current management consists of surgical resection, radiation therapy, and chemotherapy. ERBB2/HER2-positive BrM have demonstrated encouraging responses to ERBB2/HER2-targeted therapies in recent clinical trials.2 Unfortunately, in patients with ERBB2/HER2-negative BrM, no targeted therapies have shown even modest benefits.3