Fig. 3

Microscopic and immunohistochemical findings of a biopsy specimen from the transitional zone between the carcinomatous and sarcomatous components. a–d In the transitional zone between the two components, there were scattered malignant cells expressing pan-cytokeratin, vimentin, or p63. a Hematoxylin and eosin, b p63, c vimentin, and d pan-cytokeratin (× 200)