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Updated: Aug 22, 2025
06:18
Optical Clearing and Imaging of Immunolabeled Kidney Tissue
Published on: July 22, 2019
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CAIX Immunostaining in Non-neoplastic Renal Diseases
Arsani Yousef1,2, Sung Sun Kim1,3, Adriana Krizova1,2
1Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, Canada.
Cancer Diagnosis & Prognosis
|November 7, 2022
Summary
Carbonic anhydrase 9 (CAIX) is a useful marker for diagnosing renal cell carcinoma (RCC). CAIX immunostaining shows distinct patterns in clear cell RCC and other kidney conditions, aiding in early neoplasm detection.
Area of Science:
- Nephrology
- Oncology
- Biochemistry
Background:
- Carbonic anhydrase 9 (CAIX) is a metalloenzyme linked to cell growth and pH regulation.
- CAIX is overexpressed in renal cell carcinoma (RCC), often due to Von Hippel-Lindau (VHL) gene mutations and hypoxia-inducible factor 1 (HIF-1) activation.
Purpose of the Study:
- To evaluate the utility of CAIX immunostaining as an auxiliary diagnostic tool for renal malignancies.
- To differentiate between various types of renal cell carcinoma and medical renal diseases using CAIX expression patterns.
Main Methods:
- Immunohistochemical analysis of CAIX expression in kidney tumor and disease tissue samples.
- Independent assessment of CAIX staining intensity and patterns by two pathologists.
Main Results:
- Strong, diffuse membranous staining for CAIX was observed in 94% of clear cell RCC cases.
- Distinct staining patterns (box-like in ccRCC, cup-shaped in papillary RCC) were identified.
- Non-neoplastic renal conditions generally showed negative or patchy CAIX staining, with specific patterns noted in transplanted kidney and end-stage renal disease cases.
Conclusions:
- CAIX immunostaining is a valuable ancillary diagnostic marker for renal cell carcinoma.
- Specific CAIX staining patterns can help differentiate RCC subtypes.
- Observed CAIX reactivity in certain non-neoplastic conditions may indicate early-stage renal neoplasms requiring further investigation.
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