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Validity of kidney-preserving surgery for localized renal cell carcinoma
Abstract:
A study was performed to evaluate whether kidney-preserving surgery would be appropriate or not, and in the affirmative for which indications. Eighty-one kidneys removed at Seoul National University Hospital between January 1987 and June 1991 were serially cut into 5-mm slices to probe for any small renal lesions. Of the 81 kidneys, 15 (18.5%) renal units contained 39 satellite nodules with histological patterns identical to the primary tumor. The number of satellite nodules was 2.6 per kidney (range 1-6). The size of the satellite nodules ranged from 0.5 to 2 cm (mean 0.9 cm). The presence of satellite nodules increased with increasing T stage and size of the primary tumor (p < 0.05 by Fisher's exact test). The presence of satellite nodules was significantly different between kidneys with primary tumors larger than 7 cm and less than 7 cm (p < 0.05 by the chi 2 test). Especially, no satellite nodules were found in 23 kidneys whose primary tumors were less than 5 cm. These observations suggest that kidney-preserving surgery could be a valuable treatment option for small localized renal cell carcinoma not only in patients with a single kidney or deteriorated contralateral kidney function but also in patients with normal contralateral kidneys, especially when the size of the tumor is less than 5 cm.
Insights
Kidney-preserving surgery is a viable option for small renal cell carcinoma. Satellite nodules, indicative of potential spread, were absent in tumors smaller than 5 cm, supporting this approach.
Area of Science:
- Urology
- Nephrology
- Surgical Oncology
Background:
- Kidney-preserving surgery is increasingly considered for renal tumors.
- Evaluating indications for kidney-preserving surgery is crucial for patient outcomes.
- Understanding tumor characteristics that permit kidney preservation is essential.
Purpose of the Study:
- To determine the appropriateness of kidney-preserving surgery.
- To identify specific indications for kidney-preserving surgical approaches.
- To assess the prevalence and characteristics of satellite nodules in renal cell carcinoma.
Main Methods:
- Analysis of 81 surgically removed kidneys from January 1987 to June 1991.
- Serial slicing of kidneys into 5-mm sections to identify renal lesions.
- Histopathological examination to detect and characterize satellite nodules.
Main Results:
- Satellite nodules were found in 18.5% of kidneys, averaging 2.6 per kidney.
- Nodule size ranged from 0.5 to 2 cm, with a mean of 0.9 cm.
- Satellite nodules were more common in larger tumors (p < 0.05) and absent in tumors < 5 cm.
Conclusions:
- Kidney-preserving surgery is a potential treatment for localized renal cell carcinoma.
- Tumor size < 5 cm is a key indicator for considering kidney-preserving surgery.
- This approach is suitable even for patients with normal contralateral kidney function.