Nephroureterectomy With and Without Lymph Node Dissection for Upper Tract Urothelial Cell Carcinoma

The goal of this study is to conduct the first randomized-controlled trial to determine the oncologic efficacy of lymph node dissection in participants with upper tract urothelial cell carcinoma. The main questions it aims to answer are: * To determine oncologic outcomes, specifically 2-year recurrence-free survival * To determine other oncologic outcomes including treatment-free, cancer-specific and overall survival * To determine time to recurrence and recurrence patterns * To determine use of adjuvant therapies * To determine perioperative complications Participants will undergo nephroureterectomy with or without lymph node dissection. Researchers will compare these two groups to determine the oncologic efficacy of performing lymph node dissection.