ArticleFrontiers in oncology2026
Clinical features and treatment challenges of HER2-positive primary breast squamous cell carcinoma: a case report and literature review.
Article in Frontiers in oncology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Primary breast squamous cell carcinoma (PBSCC) with HER2-positive status is exceptionally rare, with fewer than 100 cases reported globally, and HER2 positivity occurring in only 5.8-7.1% of these cases. No established treatment standards exist for this entity. We present the case of a 43-year-old woman with HER2-positive PBSCC who exhibited a poor response to neoadjuvant TCHP therapy (Miller-Payne grade 2). Local recurrence occurred just 3 months after mastectomy. Second-line therapy with pyrotinib plus capecitabine provided 9 months of disease control before lung metastasis emerged. Subsequent molecular profiling revealed a
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