Furthermore, TCam-2-ΔSOX2/FOXA2 derived tumors stained positive for pluripotency and seminoma markers OCT3/4, SOX17, TFAP2C, and PRDM1/BLIMP1 (Figure 2), but were negative for the differentiation-markers AFP and EOMES (Figure 3). The gene discussed is SOX17; the disease is seminoma.