The tumour was strongly and diffusely positive for AE1/AE3, and CK7, while negative for calretinin, WT1, and D2-40 (podoplanin) (mesothelial markers); S100 protein and Melan A (melanoma markers), and CD34 (epithelioid sarcoma markers). The gene discussed is PDPN; the disease is epithelioid sarcoma.