Immune-Related Adverse Events (Irae) In Gu Cancer Patients Receiving Immune Checkpoint Inhibitors.

422Background: Immune checkpoint inhibitors (ICI), particularly PD-1 and PD-L1 antibodies, prolong survival in advanced renal cell (RCC) and urothelial cancer (UC) patients. However, they can cause a variety of serious irAE. We assessed frequency and onset of irAE at experienced centers, and evaluated whether baseline characteristics were associated with irAE. Methods: Pharmacy and clinic schedules identified RCC and UC patients treated with ICI at USC Norris (n = 51) and UCLA (n = 26) from 2014-2016. Prior radiation was defined as completion within 3 months before ICI. Fisher’s exact 2-tailed test was used to evaluate for associations of variables with irAE. Results: 77 patients median age 69 years (49-93) received ICI, 31 with RCC and 46 with UC; 36 received atezolizumab, 29 nivolumab, 9 pembrolizumab, 2 durvalumab, and 1 avelumab. 25 (32.5%) had irAE including pneumonitis (4%), myositis (3%), neurologic event (1%), hepatitis (8%), colitis (1%), rash (8%), endocrinopathy (6%), or hematologic event (1%)....