MUC1 and neoplasm: Immunohistochemical staining showed the poor-differentiated tumor cells and cells within the cartilaginous areas in both the kidney (Figure2c,2d,2e,2f) and the ureter were positive for Vimentin, CD99and S-100 protein but were negative for cytokeratin, epithelial membrane antigen ,E-cadherin, Leu7, neuron-specific enolase, SMA, CD34, p63 and desmin.