HE4 might be a more useful tumor biomarker to detect malignancy in patients with ovarian endometrioma when malignancy is suspected.

ABSTRACT

OBJECTIVE: To analyze the utility of carbohydrate antigen (CA)125 and human epididymis protein 4 (HE4) to detect malignancy in women with ovarian endometriosis, when ovarian cancer is suspected and ultrasonography results are inconclusive. METHODS: Women who underwent surgery between 2015 and 2019 for ovarian endometriosis or for adnexal masses, with a final diagnosis of ovarian carcinoma (clear cell and endometrioid) were included in this retrospective study. The women were divided into three groups ovarian endometriosis (OE), ovarian carcinoma without endometriosis (OC), and ovarian carcinoma with endometriosis (OC + E). Adnexal masses were assessed preoperatively by transvaginal ultrasonography according to the International Ovarian Tumor Analysis (IOTA) simple rules, and CA125 and HE4 blood levels were obtained. RESULTS: Of 208 women, 45 had malignancy, 16 in the OC + E group and 29 in the OC group. According to transvaginal ultrasonography, 13 were classified as undetermined risk of malignancy OC group 3, OE group 3, and OC + E group 7. When we compared the tumor biomarkers, significant differences in HE4 but not in CA125 levels were found between the groups. CONCLUSIONS: When ovarian malignancy is suspected in patients with ovarian endometriosis, HE4 is a more useful tumor biomarker to diagnose OC when ultrasonography results are inconclusive.