Brain metastases were more frequently observed in patients with ER or PgR‐positive BCs and in HRs negative tumors than in patients with a TP subtype, even though this difference did not reach statistical significance (29.6 and 27.8%, respectively, vs . 20.8%; p = 0.06).
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Distinct HR expression patterns significantly affect the clinical behavior of metastatic HER2+ breast cancer and degree of benefit from novel anti-HER2 agents in the real world setting.
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