Diagnostic performance of human epididymis protein 4 compared to a combination of biophysical and biochemical markers to differentiate ovarian endometriosis from epithelial ovarian cancer in premenopausal women

AIM: This study is a comparison of human epididymis protein 4 (HE4) with cancer antigen 125 (CA125), using the Risk of Ovarian Malignancy Algorithm (ROMA), Copenhagen Index (CPH-I), Risk of Malignancy Index (RMI) and Morphology Index (MI) to differentiate ovarian endometriosis from epithelial ovarian cancer (EOC) in premenopausal women. METHODS: The study was performed at the University Clinic of Obstetrics and Gynecology in Skopje. One hundred and sixty-four premenopausal patients were divided into three study groups, including ovarian endometriosis (37), other benign pelvic masses (57) and EOCs (11), and a control group (59). After ultrasonography, all subjects underwent blood sampling. Surgery and histological verification was performed. Pelvic masses were classified based on histological findings. Mann-Whitney, receiver operating characteristic-area under the curve (AUC), sensitivity, specificity and Kruskal-Wallis tests were used for statistical analysis. The level of significance α was set at 5%. RESULTS: For each of the tested markers, sensitivity, specificity and accuracy to distinguish ovarian endometriosis from EOC were as follows: HE4 (81.82%, 100%, 95.83%); CA125 (81.82%, 48.65%, 56.25%); ROMA (90.91%, 83.78%, 85.42%); CPH-I (81.82%, 97.30%, 93.75%); RMI (90.91%, 35.14%, 47.92%); and MI (100%, 75.68%, 81.25%), respectively. The AUC for ovarian endometriosis compared to EOC for tested markers was as follows: HE4 (AUC = 0.934), CA125 (AUC = 0.821), ROMA (AUC = 0.929), CPH-I (AUC = 0.924) and RMI (AUC = 0.880), respectively. CONCLUSION: HE4 and CPH-I perform best to discriminate ovarian endometriosis from EOC in premenopausal women. MI has maximal sensitivity to detect EOC.