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[The WHO/ISUP grading system for renal carcinoma].
Der Pathologe 2016 July
Histological tumor grading is an accepted prognostic parameter of renal cell carcinoma (RCC). In 2012, the International Society of Urologic Pathologists (ISUP) proposed a novel grading system for RCC, mainly based on the evaluation of nucleoli: grade 1 tumors have nucleoli that are inconspicuous and basophilic at ×400 magnification; grade 2 tumors have nucleoli that are clearly visible at ×400 magnification and eosinophilic; grade 3 tumors have clearly visible nucleoli at ×100 magnification; and grade 4 tumors have extreme pleomorphism or rhabdoid and/or sarcomatoid morphology. This grading system was validated for clear cell renal cell carcinoma and papillary renal cell carcinoma. At the same time, the ISUP proposed not grading chromophobe renal cell carcinomas according to this system. At a consensus conference in Zurich the World Health Organization (WHO) recommended the ISUP grading system; thus, the WHO/ISUP grading system is now going to be implemented internationally. The ISUP/WHO grading system has not been validated as a prognostic parameter for other tumor subtypes, but can be used for descriptive purposes.
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