While the HER2-ultralow subgroup did not reach statistical significance (mPFS 13.2 vs. 8.3 months; HR 0.78, 95% CI 0.50–1.21), the clinically meaningful improvement prompted FDA approval in January 2025 for HR+/HER2-low/ultralow metastatic breast cancer following progression on endocrine therapy.
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HER2 expression in cervical squamous cell carcinoma: high prevalence of HER2-low/ultralow and spatiotemporal heterogeneity across tumor evolution.
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