The tumour cells show variable expression of cytokeratins (e.g. CAM5.2, AE1/AE3, cytokeratin 7), EMA, inhibin, calretinin, SF1, WT-1, AR, ER, PR, PAX8, CD10 and D2-40, and are negative for claudin-4 and FOXL2. The gene discussed is FOXL2; the disease is neoplasm.