S100B and synovial sarcoma: Our analysis of morphological, immunohistochemical, and molecular patterns in SS with regard to histological subtype reveals epithelial positivity for E-cadherin and cytokeratin 19 as well as vimentin and S100b protein expression, the lack of CDKN2A mRNA, and low levels of EGFR and PDGFRL mRNA in biphasic SS.