924P - Pathologic outcomes after neoadjuvant chemotherapy for high-risk muscle invasive bladder cancer

Neoadjuvant chemotherapy (NAC) with cisplatin-based chemotherapy for muscle invasive bladder cancer (MIBC) has improves overall survival as compared to radical cystectomy (RC) alone. Our group has previously reported high risk features of MIBC that increase benefit of NAC. We report our institutional experience with NAC for patients with high-risk MIBC. The records of consecutive high-risk, clinically node negative MIBC patients who underwent RC at our institution between 2005 and 2017 were reviewed. Pre-operative high-risk criteria included one or more of lymphovascular invasion, hydronephrosis, extravesical disease, and/or variant histology. Clinicopathologic and demographic information was collected, including eGFR and a previously validated frailty index. The primary outcomes were pathologic complete response (pCR=pT0N0M0) and downstaging to