Current evidence on CA-125 levels in differentiation between endometriomas and endometriosis-associated ovarian cancer – A systematic review and meta-analysis

Background: Although significant advancements have been made in the diagnostic and therapeutic methods of gynecological oncology, ovarian cancer continues to pose a significant challenge. The measurement of CA-125 levels is commonly considered the preferred approach for assessing the necessity of surgical intervention, hence guaranteeing a conclusive diagnosis. The objective of this study is to conduct a comparative analysis of existing literature about the effectiveness of serum CA-125 levels in distinguishing between endometriosis-associated ovarian cancer (EAOC) from ovarian endometrioma. Material and methods: The researchers conducted separate searches in the PubMed and Web of Science databases to identify peer-reviewed papers that examined the serum or plasma CA-125 marker. The search was conducted from the start of both databases until April 4th, 2024. Results: After conducting a literature search, a total of 114 studies were identified for review. Out of these, three studies satisfied the inclusion criteria and were consequently included. The results of the pooled analysis indicate that there is no statistically significant difference between the groups (336.3 ± 667.6 vs 530.6 ± 548.9, respectively; standard deviation = 0.51; 95% confidence interval: −0.63 to 1.64; p = 0.39). Conclusion: Unfortunately, the biomarker CA-125, which is commonly selected, has exhibited restricted effectiveness in distinguishing between EAOC and endometriomas. The existing body of literature on this topic indicates a significant dearth of research regarding the use of CA-125 as a means of differentiating between EAOC and endometriomas. Enhanced diagnostic techniques are necessary for the detection and characterization of ovarian tumors, encompassing those originating from endometriosis.