SOX2 and ovarian small cell carcinoma: Because our immunohistochemical results proved that the patient had ovarian small cell carcinoma complicated with mucinous adenocarcinoma, and CD56, BRG1, INI-1, TFF-1, and SOX-2 were only suggested to be expressed in some literatures, we did not test the immunohistochemical results for CD56, BRG1, INI-1, TFF-1, and SOX-2.