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The current TNM system for renal cell carcinoma (RCC) merges perirenal fat invasion (PFI) and renal vein invasion (RVI) as stage pT3a despite limited evidence concerning their prognostic equivalence. In addition, the prognostic value of PFI compared to pT1–pT2 tumors remains controversial.To analyze the prognostic significance of PFI, RVI, and tumor size in pT1–pT3a RCC.Data for 7384 pT1a–pT3a RCC...
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