904PImpact of different programmed cell death ligand-1 (PD-L1) expression algorithms on patient selection and durvalumab efficacy in urothelial carcinoma (UC). (23rd October 2018) - Walker, J; Zajac, M; Ye, J; Scott, M; Ratcliffe, M; Scorer, P; Barker, C; Al-Masri, H; Rebelatto, M C; Gupta, A; Mukhopadhay, P; Ferro, S; et al.