CCNE1 and ovarian endometrial cancer: In contrast, 43.8% of serous (21/48), 55.6% of mucinous (10/18) and 40.0% of endometrioid ovary tumor specimens (12/30) were strong for CCNE1 staining (Table 1, Figures 2D, S1C, 2E, S1D, 2F and S1E).