CA-125: Tumor Marker for Ovarian Cancer Explained
CA-125 is a blood marker used primarily to monitor ovarian cancer. Elevated levels may indicate tumor-related or other conditions and require medical evaluation.
Things worth knowing about "CA-125"
CA-125 is a blood marker used primarily to monitor ovarian cancer. Elevated levels may indicate tumor-related or other conditions and require medical evaluation.
What is CA-125?
CA-125 (Cancer Antigen 125) is a glycoprotein that can be detected in the blood and belongs to the group of tumor markers – biological substances whose blood concentrations may rise in certain diseases, particularly cancers. CA-125 is mainly produced by cells of the peritoneum (the lining of the abdominal cavity), the uterus, and the ovaries. It is most widely known for its role in the diagnosis and monitoring of ovarian cancer.
Medical Significance and Applications
CA-125 is primarily used in clinical practice for the monitoring and follow-up of ovarian cancer (ovarian carcinoma). It is the most important blood marker for this disease. However, elevated CA-125 levels can also occur in a range of other conditions, including:
- Ovarian cancer (ovarian carcinoma) – most common indication
- Endometriosis (growth of uterine lining tissue outside the uterus)
- Uterine cancer (endometrial carcinoma)
- Peritoneal diseases (peritonitis, peritoneal carcinomatosis)
- Liver disease and cirrhosis
- Heart failure with fluid retention
- Lung conditions with pleural effusion
It is important to note that an elevated CA-125 level alone does not confirm a cancer diagnosis. Many benign (non-cancerous) conditions can also cause elevated values.
Diagnosis: How is CA-125 Measured?
CA-125 is measured through a simple blood draw. The sample is analyzed in a laboratory using immunological assays such as ELISA or electrochemiluminescence. The reference value at most laboratories is below 35 U/mL (units per milliliter). Values above this threshold are considered elevated and require further medical investigation.
Limitations of the Test
CA-125 is not an ideal screening test for the general population, as the marker lacks sufficient specificity. This means that many women with elevated CA-125 do not have cancer, and conversely, early-stage ovarian cancer may be present even with a normal CA-125 level. For this reason, CA-125 is generally not recommended as a standalone screening tool, but rather used in combination with other examinations such as ultrasound (sonography) or clinical assessment.
CA-125 in Ovarian Cancer: Follow-Up and Treatment Monitoring
Once ovarian cancer has been diagnosed, CA-125 is measured regularly to:
- Assess the response to chemotherapy
- Detect a recurrence (relapse) of the disease at an early stage
- Monitor the course of the disease after surgery
A significant rise in CA-125 levels during follow-up may indicate a recurrence and warrants renewed medical evaluation and possibly further diagnostic workup.
When to See a Doctor
If a blood test reveals an elevated CA-125 level, it is important to consult a doctor promptly. The physician will interpret the result in the context of the individual medical history, any symptoms present, and additional test results. Symptoms such as abdominal pain, bloating, unintentional weight loss, or changes in urination should be taken seriously and investigated without delay.
References
- Jacobs I, Bast RC Jr. - The CA-125 tumour-associated antigen: a review of the literature. Human Reproduction, 1989;4(1):1-12.
- National Comprehensive Cancer Network (NCCN) - Clinical Practice Guidelines in Oncology: Ovarian Cancer. NCCN, 2024.
- World Health Organization (WHO) - Guide to Cancer Early Diagnosis. WHO, Geneva, 2017.
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