In addition, pathological stage, lymph node metastasis, chemotherapeutic resistance, serum CA72–4 level, serum CEA level and age were identified as significant prognostic factors in ovarian clear-cell carcinoma, serous carcinoma, or papillary serous cystadenocarcinoma, respectively (Table 2 and Table 3, p < 0.05). Here, CEACAM5 is linked to ovarian clear cell cancer.