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How do we interpret an elevated carbohydrate antigen 19-9 level in asymptomatic subjects?
1Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 135-710, Republic of Korea.
Elevated cancer antigen 19-9 (CA 19-9) levels in asymptomatic patients warrant further investigation, not screening. Persistent elevation requires work-up to determine the underlying cause, as malignancy is rare.
Area of Science:
- Oncology
- Clinical Chemistry
Background:
- Cancer antigen 19-9 (CA 19-9) is a tumor marker.
- Elevated CA 19-9 levels can be associated with various conditions, including malignancies and benign diseases.
Purpose of the Study:
- To investigate the causes of elevated CA 19-9 levels in asymptomatic individuals.
- To establish guidelines for managing asymptomatic patients with elevated CA 19-9.
Main Methods:
- Prospective cohort study of asymptomatic patients with CA 19-9 >37 U/mL.
- Serial CA 19-9 monitoring and further diagnostic studies based on trend.
- Follow-up duration of at least 6 months.
Main Results:
- 0.8% of 62,976 patients had elevated CA 19-9.
- Of 353 followed subjects, 2.8% were diagnosed with malignancies.
- 27.5% had benign diseases, and 69.7% were non-specific.
Conclusions:
- CA 19-9 is not a reliable screening tool.
- Persistently elevated CA 19-9 necessitates etiological investigation.
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