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Renal sinus involvement in renal cell carcinomas.
S M Bonsib1, D Gibson, M Mhoon
1Department of Pathology, University of Arkansas for Medical Sciences, Little Rock 72212, USA.
The American Journal of Surgical Pathology
|March 15, 2000
Summary
Renal sinus invasion, particularly into veins, can indicate metastasis risk in kidney cancer, even for tumors appearing limited. This finding suggests examining sinus invasion is crucial for accurate cancer staging and prognosis.
Area of Science:
- Urology
- Oncology
- Pathology
Background:
- The renal sinus is a critical kidney compartment containing vessels.
- Tumor invasion into the renal sinus may facilitate cancer spread.
- Accurate staging of renal cell carcinoma (RCC) is vital for prognosis.
Purpose of the Study:
- To investigate the incidence and prognostic significance of renal sinus invasion in RCC.
- To determine if renal sinus invasion predicts metastasis in tumors appearing localized.
Main Methods:
- Histopathological analysis of 31 consecutive renal carcinomas.
- Detailed examination of the interface between tumors and renal sinus fat and veins.
- Correlation of sinus invasion with tumor characteristics and clinical outcomes.
Main Results:
- Fourteen of 31 (45%) renal carcinomas invaded the renal sinus fat; 9 of these also invaded sinus veins.
- Clear cell RCC showed higher rates of sinus invasion (13/22) compared to other subtypes.
- Even in tumors appearing pT1/pT2, 30.4% invaded sinus fat and 17.4% invaded sinus veins.
- Sinus-positive tumors were larger, had higher nuclear grades, and more frequent renal capsule/vein involvement.
Conclusions:
- Renal sinus invasion, especially venous invasion, is a significant indicator of metastatic potential in RCC.
- This feature may identify patients at risk even with seemingly localized tumors.
- Further research is warranted to incorporate renal sinus invasion into TNM staging for RCC.