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Alpha-fetoprotein producing renal cell carcinoma: a case report
1Department of Diagnostic Pathology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea. smhong@www.amc.seoul.kr
Journal of Korean Medical Science
|July 29, 1998
Summary
This study details a rare case of alpha-fetoprotein (AFP) producing renal cell carcinoma. Elevated serum AFP levels in patients without liver cancer may indicate this specific kidney tumor type.
Area of Science:
- Oncology
- Biochemistry
- Pathology
Background:
- Renal cell carcinoma (RCC) is a common kidney malignancy.
- Alpha-fetoprotein (AFP) is a tumor marker typically associated with liver cancer.
- Paraneoplastic syndromes in RCC are well-documented but AFP production is exceptionally rare.
Observation:
- A 53-year-old male presented with fever and a left renal mass.
- Computed tomography revealed a renal mass; liver imaging was negative for neoplasms.
- Serum AFP levels were significantly elevated at 1,460 ng/ml.
Findings:
- Radical nephrectomy identified a 10 cm renal mass with distinct histological areas.
- Immunohistochemistry confirmed AFP production solely by granular tumor cells, not clear cell carcinoma.
- Post-nephrectomy, serum AFP levels decreased dramatically, correlating with tumor removal.
- Metastatic lesions identified later were non-AFP producing, suggesting a shift in tumor characteristics.
Implications:
- This case highlights that elevated serum AFP can be a marker for renal cell carcinoma in the absence of liver disease.
- AFP-producing renal cell carcinoma, though rare, should be considered in the differential diagnosis of elevated AFP.
- Serum AFP monitoring may be a valuable tool for detecting and managing this rare subtype of kidney cancer.