SOX9 and endometrioid adenocarcinoma: performed SOX9 immunohistochemical staining on 152 ovarian tumors, including 36 pure Sertoli cell tumors, 38 endometrioid borderline tumors, 26 well-differentiated endometrioid carcinomas, 13 sertoliform endometrioid carcinomas, and 39 carcinoid tumors.