Association between cell-free tumor DNA (ctDNA) and outcome. A, Bladder recurrence-free survival stratified by TERT promoter mutation. B, Overall survival of patients stratified by TERT promoter mutation. C, Change of ctDNA level before and after radicalnephroureterectomy (RNU). D, Bladder recurrence-free survival stratified by TERT promoter mutation in post-RNU urine