The distribution across T stages indicated a moderately higher HER2 positivity in non-muscle-invasive (≤ T1) tumors (55.6%) than in muscle-invasive tumors (T2: 41.9%, ≥ T3: 43.6%), although these differences did not reach statistical significance.
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Human epidermal growth factor receptor 2 overexpression is associated with high-grade tumors in upper tract urothelial carcinoma.
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