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English⧼Colon⧽ F1: Malignant adenomyoepithelioma of the breast. (A) Biphasic proliferation of both inner eptithelial and outer myoepithelial cells was shown (H&E stain, ×200). (B) Atypia was obvious in both myoepithelial and ductal epithelial cells with moderate degree of nuclear pleomorphism, prominent nucleoli, high nuclear cytoplasmic ratio and increased mitotic figures (H&E stain, ×400). (C) The ductal cells were positive for CK5/6 (immunoperoxidase, ×40). (D) The myoepithelial cells were positive for p63 (immunoperoxidase, ×40). (E) The tumor showed lymphovascular invasion (H&E stain, ×100).