VIM and undifferentiated pancreatic carcinoma: The carcinoma tests positive for epithelial tissue markers cytokeratin (such as cytokeratins 7, 8, 18, 19, and pan-cytokeratin AE1/AE3), and the sarcoma component is positive for mesenchymal tissue marker vimentin.[2] Most pancreatic carcinosarcomas are composed of carcinoma and sarcoma components, one each.