Immunohistochemically, the tumor cells were positive for epithelial markers (AE1/AE3, EMA), a smooth muscle marker (desmin), and less specific sex-cord markers (CD56, WT-1, CD99), but negative for relatively specific sex-cord markers (α-inhibin, calretinin, FOXL2, and SF1). The gene discussed is WT1; the disease is neoplasm.