Expression of HE4 in ovarian tumor tissues Immunohistochemical staining of HE4 in serous ovarian cancer (Fig3A, ×400); mucous ovarian cancer (Fig3B, ×400); hyaline cell cancer (Fig3C, ×400); ovarian adenoendometrio carcinoma (Fig3D, ×400); corpus luteum cyst tumor (Fig3E, ×400); germ cell tumor (Fig3F, ×400); borderline ovarian tumor (Fig3G, ×400); ovarian benign tumor (Fig3H, ×400); ovarian endometriosis cyst (Fig 3I, ×400).