Sarcomatoid carcinoma is a biphasic malignant neoplasm exhibiting morphologic and/or immunohistochemical evidence of epithelial and mesenchymal differentiation By immunohistochemistry, epithelial elements react with cytokeratins, whereas stromal elements react with Vimentin or specific markers corresponding to the mesenchymal differentiation. This evidence concerns the gene VIM and sarcomatoid carcinoma.