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pT2 classification for renal cell carcinoma. Can its accuracy be improved?
Igor Frank1, Michael L Blute, Bradley C Leibovich
1Department of Urology, Mayo Medical School and Mayo Clinic, Rochester, Minnesota 55905, USA. frank.igor@mayo.edu
The Journal of Urology
|January 12, 2005
Summary
Subclassifying pT2 renal cell carcinoma (RCC) tumors by size improves prognostic accuracy. Tumors 7-9.9 cm are pT2a, while those 10 cm or larger are pT2b, enhancing the current RCC tumor classification.
Area of Science:
- Urology
- Oncology
- Pathology
Background:
- The 2002 tumor classification for renal cell carcinoma (RCC) categorizes pT2 tumors as those >7 cm but confined to the kidney.
- Current classification lacks granularity within the pT2 stage, potentially limiting prognostic precision.
Purpose of the Study:
- To investigate if a size-based subclassification within pT2 RCC improves prognostic accuracy.
- To determine an optimal size cutoff point for subclassifying pT2 tumors.
Main Methods:
- Analysis of 544 patients with unilateral, sporadic pT2 RCC undergoing nephrectomy (1970-2000).
- Cox proportional hazards regression and martingale residuals used to assess tumor size association with RCC mortality.
- Evaluation of potential size cutoffs (9 cm vs. 10 cm) for subclassification.
Main Results:
- Tumor size was significantly associated with RCC death (HR 1.08, p<0.001).
- A 10 cm cutoff demonstrated superior prognostic performance compared to a 9 cm cutoff when adjusted for nodal status and metastasis (HR 1.42, p=0.017).
- Proposed subclassification: pT2a (7-9.9 cm) and pT2b (≥10 cm).
Conclusions:
- Subclassifying pT2 RCC into pT2a and pT2b categories based on a 10 cm cutoff enhances prognostic accuracy.
- This refined classification offers improved risk stratification for patients with renal cell carcinoma.