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The study explored the impact of grading in urothelial bladder cancer (UBC) stages Ta and T1, comparing World Health Organization (WHO) grading classifications from 1973 and 2004. The study included patients with primary Ta and T1 UBC between 1992 and 2007. Results revealed that recurrence and progression were more common in higher-grade tumors, larger tumors, and T1-stage tumors. Notably, a four-tier combined WHO73/04 classification showed improved accuracy for predicting recurrence and progression compared to the individual classifications.
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