QRT-PCR assay determined the expression level of KPNA2 in dysgerminomas, yolk sac tumors, mixed ovarian germ cell tumors, and immature teratoma as 4.13 times, 2.11 times, 2.66 times and 3.5 times higher pronounced than normal ovarian specimens, respectively (Figure 1C,E). Here, KPNA2 is linked to yolk sac tumor.