Extensive SALL4 expression was observed in 3/3 dysgerminomas, 6/6 yolk sac tumors, 6/9 immature teratomas and 4/4 mixed ovarian germ cell tumors (mixed with yolk sac tumors and embryonal carcinomas), 1/1 embryonal carcinoma, compared with the normal ovarian specimens. The gene discussed is SALL4; the disease is ovarian mixed germ cell neoplasm.