Carcinosarcoma of the deep lobe of the parotid gland in the parapharyngeal region: A case report

Figure 4 Immunohistochemical results. A-C: The tumor epithelium in the pleomorphic adenoma area was positive for CK7 (A), calponin (B), and CK5/6 (C); D-F: In the mixed area of pleomorphic adenoma (right) and salivary duct carcinoma (left), the tumor epithelium in the salivary duct carcinoma area was positive for AR (D) and HER2 (E), and the Ki-67 proliferation index in the salivary duct carcinoma area was higher than that in the pleomorphic adenoma area (F); G: PCK was negative in osteosarcoma tumor cells; H: Cells in the osteosarcoma area were positive for vimentin; I: The Ki-67 proliferation index of tumor cells in the osteosarcoma area was approximately 50%.