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Left breast malignant mass. A: High grade intraductal carcinoma and interstitial infiltration revealed by hematoxylin & eosin (H&E) staining; B: Low grade invasive ductal carcinoma revealed by H&E staining; C: Immunohistochemical staining for estrogen receptor, human epidermal growth factor receptor-2, and Ki67 (× 40). ER: Estrogen receptor; HER-2: Human epidermal growth factor receptor-2.
