PAX8 and neoplasm: Immunohistochemistry showed that the tumor cells were diffusely positive for SF-1 (Fig. 3A) and Ki-67 (Fig. 3B), partially positive for inhibin (Fig. 3C), and negative for CAM5.2, CK7, CK20, C-KIT, CD30, LCA, GATA-3, TTF-1, and PAX8.