The evolving classification of renal cell neoplasia

Area of Science:

• Uropathology
• Oncology
• Genetics

Background:

• Renal cell neoplasia classification traditionally relies on morphology.
• Over 35 years, genetic characteristics have increasingly influenced tumor diagnosis.
• The 2013 Vancouver classification updated recognized renal cell carcinoma (RCC) types.

Purpose of the Study:

• To review the evolution of renal cell neoplasia classification.
• To highlight newly established and emerging RCC entities.
• To emphasize the integration of genetic data in RCC diagnosis.

Main Methods:

• Review of historical and current renal cell neoplasia classifications.
• Analysis of diagnostic criteria incorporating morphological and genetic features.
• Identification of novel and emerging RCC subtypes.

Main Results:

• The 2013 Vancouver classification recognized 17 malignant and 2 benign renal parenchymal tumors.
• Newly established RCC entities include tubulocystic RCC, acquired cystic disease-associated RCC, and others.
• Emerging entities likely for future classification include thyroid-like follicular RCC and SDHB-mutation-associated RCC.

Conclusions:

• Renal cell neoplasia classification is evolving beyond morphology to include genetics.
• Several novel and emerging RCC subtypes require recognition and further study.
• Future classifications will likely incorporate a broader range of genetically defined RCC entities.