Urothelial carcinoma of the upper urinary tract: Comparison between the WHO/ISUP 1998 consensus classification and WHO 1999 classification system

Tumor stage was a very strong predictor of prognosis in this series of patients treated with open surgery. The tumor grade had little additional prognostic value, although a small advantage was found for the WHO 1999 classification, but only for high-grade, Stage pT3 tumors.