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PURPOSE Patients undergoing endoscopic management for upper tract urothelial carcinoma often progress to definitive therapy with radical nephroureterectomy. This study examined the rate of progression as well as risk factors for transitions in treatment over time. METHODS Retrospective review at two institutions identified patients undergoing endoscopic management for upper tract urothelial carcinoma. Patients were assessed for progression to radical nephroureterectomy. Baseline characteristics were compared using Chi square analysis. K