Cancer Antigen 125 (CA-125) is a glycoprotein biomarker used in the medical field for the detection and management of ovarian cancer. CA-125 is found in higher concentrations in the blood of women with ovarian cancer; its applications extend beyond cancer detection, as high levels may also be found in various non-cancerous conditions.
Clinical Significance of CA-125
CA-125 plays an important role in diagnosing and managing diseases, including:
- Ovarian Cancer Detection: Screening and Diagnosis with Monitored Treatment.
- Non-Ovarian Cancers: Elevated CA-125 levels are not exclusive to ovarian cancer. They are also observed in other malignancies, e.g., fallopian tube, endometrial, pancreatic, breast, and other colorectal cancers. In these cases, CA-125 is used more as a secondary marker for assessing the extent of disease or treatment effectiveness.
- Non-Cancerous Conditions:
- Endometriosis: It is a condition in which tissue similar to the uterine lining grows outside the uterus, which raises the level of CA125.
- Pelvic Inflammatory Disease (PID): This infection can also raise the level of CA125.
- Menstruation
- Pregnancy: During pregnancy, the CA-125 level rises in the first trimester.
- Liver diseases like Cirrhosis raise the level of CA125.
Different Diagnostic ways to test for CA-125 level
The most common method for assessing CA-125 levels is a blood test.
Commonly used methods to detect CA-125 levels in laboratories include electrochemiluminescence (ECLIA), Chemiluminescence Immunoassay (CLIA), Enzyme-Linked Immunosorbent Assay (ELISA) and Radioimmunoassay (RIA).
The detection ofCA-125 based on the most advanced Chemiluminescence Immunoassay is used for quantitative measurement of Cancer Antigen 125 (CA125) in human serum/plasma as an aid in treatment monitoring of ovarian cancer.
Conclusion CA125 , a tumour marker, is primarily associated with epithelial ovarian cancer. While elevated levels of CA125 can indicate the presence of malignancy, particularly in postmenopausal women, higher levels are also observed in various benign conditions such as menstruation, endometriosis, pelvic inflammatory disease, and pregnancy. Therefore, in patients with confirmed ovarian cancer, CA125 is particularly useful for monitoring treatment response and detecting recurrence. Diagnosing CA125 levels through blood tests helps healthcare providers understand the underlying causes of ovarian cancer and develop appropriate treatment plans..
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