Immunohistochemical staining (IHC) using primary mouse monoclonal antibodies against pan-cytokeratin (PCK) clone AE1/AE3 (Dako, Denmark), diluted 1:100, and Ki-67 antigen clone MIB-1 (Dako, Denmark) diluted 1:100 was carried out to confirm epithelial origin of the tumor and to estimate its proliferative activity and indirectly assess a histologic malignancy. Here, MKI67 is linked to neoplasm.