MP59-17 DEVELOPMENT AND INTERNAL VALIDATION OF A PREDICTIVE MODEL FOR RECURRENCE-FREE SURVIVAL IN PTA LOW-GRADE BLADDER CANCER. (May 2022) - Daza, Jorge; Grauer, Ralph; Chen, Sophie; Lavallèe, Etienne; Razdan, Shirin; Dey, Linda; Steineck, Gunnar; Li, Qiang; Ahmed, Aly; Mehrazin, Reza; Waingankar, Nikhil; Guru, Khurshid; et al.