SMN1 and malignant myoepithelioma: Histologically, the tumor had a tubular epithelial component, admixed with a second, dominant, myoepithelial one; immunohistochemically, the former strongly reacted with anti-Cytokeratin antibodies, while the latter had a weak and patchy immunoreactivity both to Cytokeratin and a-SMA, while Vimentin and Calponin immunostaining was strong and diffuse, suggesting the diagnosis of apocrine gland carcinoma and malignant myoepithelioma.