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Small renal masses: current concepts regarding the natural history and reflections on the American Urological
1Department of Urology, Columbia University, New York, New York, USA. landman.jaime@gmail.com
Purpose Of Review:
Although surgical resection is the current standard for treatment of small (<4 cm) renal cortical neoplasms, active surveillance remains an option in selected patients depending on tumor characteristics and surgical risk. We review the natural history of small renal masses according to the current literature, and highlight issues regarding the recent guidelines for the management of T1 renal masses put forth by the American Urological Association.
Recent Findings:
The natural history of small renal masses is still largely unknown; however, initial size or volume of the mass seems to predict the risk of malignancy in retrospective studies. A new study found that growth rate is inversely related to initial tumor volume, with smaller masses growing faster in the beginning and decreasing in rate of growth as they enlarge. Biomarkers such as carbonic anhydrase IX, vascular endothelial growth factor, and CD147 have demonstrated some value in predicting tumor characteristics and prognosis in renal cell carcinoma. Finally, we suggest modifications to the new American Urological Association guidelines based on the authors' experience in order to optimize the management of renal cortical neoplasms.
Summary:
The natural history of small renal masses is not completely understood. Growth rate and tumor size are factors shown to be predictive of tumor biology. Currently, there are no specific tumor markers to determine initial risk or progression to metastatic disease; however, investigation into new molecules is being undertaken. The guidelines presented by the American Urological Association give a formal framework for the management of T1 renal cortical neoplasms; however, we site specific modifications and recommend that they be considered when evaluating patients for treatment.
Insights
The natural history of small renal masses is not fully understood, but size and growth rate predict tumor biology. Current American Urological Association guidelines offer a framework for managing T1 renal masses, with suggested modifications for patient evaluation.
Area of Science:
- Urology
- Oncology
- Nephrology
Background:
- Surgical resection is standard for small renal cortical neoplasms (<4 cm).
- Active surveillance is an option for select patients based on tumor characteristics and surgical risk.
- Understanding the natural history of small renal masses is crucial for optimal management.
Purpose of the Study:
- Review the natural history of small renal masses.
- Analyze current literature on renal mass growth and malignancy prediction.
- Evaluate recent American Urological Association guidelines for T1 renal masses.
Main Methods:
- Literature review of small renal mass natural history.
- Analysis of studies on tumor size, volume, and growth rate.
- Examination of biomarker utility in predicting renal cell carcinoma characteristics.
Main Results:
- Small renal mass natural history remains largely unknown.
- Initial tumor size/volume predicts malignancy risk; smaller masses grow faster initially.
- Biomarkers like carbonic anhydrase IX show potential in predicting tumor prognosis.
Conclusions:
- Small renal mass natural history and predictive factors (growth rate, size) require further understanding.
- No specific tumor markers currently exist for initial risk or metastatic progression.
- American Urological Association guidelines provide a framework, but modifications are recommended for evaluating T1 renal cortical neoplasms.
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