PD58-02 NOVEL USE OF CTDNA TO IDENTIFY LOCALLY ADVANCED AND METASTATIC UPPER TRACT UROTHELIAL CARCINOMA. (May 2022) - Huelster, Heather; Green, Elizabeth; Soupir, Alex; Rose, Kyle; Katende, Esther; Naidu, Shreyas; Gilbert, Scott; Manley, Brandon; Poch, Michael; Sexton, Wade; Yu, Alice; Kim, Youngchul; et al.