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α-SMA expression in malignant and benign breast lesions. (A) The expression of α-SMA in breast cancer stromal cells shows a strong positive signal. (B) The expression of α-SMA in stromal cells of benign breast lesions shows a negative signal. Magnification: 200×, staining method: PV9000. (C) α-SMA was strongly expressed in breast cancer stromal cells in groups 2 and 3 (P<0.05), indicating a decrease in the expression of α-SMA for benign tumors. α-SMA, alpha-smooth muscle actin.
