Predictors of Locoregional Recurrence and Delineation of Adjuvant Radiation Therapy Fields for Patients with Upper Tract Urothelial Carcinoma Receiving Nephroureterectomy.

and Purpose: To identify factors predictive of locoregional recurrence (LRR) in upper tract urothelial carcinoma (UTUC) treated with nephroureterectomy (NU) and propose adjuvant radiation therapy (ART) fields.