Immunohistochemistry demonstrated positive staining for epithelial membrane antigen (EMA), vimentin and Bcl-2, but negative staining for CD99, CD34, CD68, S100, cytokeratin, desmin, calretinin, HMBE-1, CK5/6 and smooth muscle actin, confirming a diagnosis of biphasic synovial sarcoma. This evidence concerns the gene MUC1 and synovial sarcoma.