The urinary system, including the bladder, ureters, urethra, and renal pelvis, is lined with urothelial tissue. Urothelial carcinoma is the predominant histologic type of cancer in that system, and 90% of tumors are located in the bladder. With more than 81,400 new cases and nearly 18,000 deaths estimated for 2020, bladder cancer is the fifth most prevalent type of cancer in the United States.