898 Demonstration of the utility of real-world progression-free survival (rwPFS) by application of an IFN-γ-related signature in a real-world cohort of patients with melanoma oleh Xuefeng Wang, Igor Puzanov, Abdul Rafeh Naqash, Ahmad A Tarhini, George J Weiner, Phaedra Agius, Margaret E Gatti-Mays, Howard Colman, Aik Choon Tan, Issam El Naqa, Timothy I Shaw, Aakrosh Ratan, Martin D McCarter, John Carpten, Susanne M Arnold, Michelle Churchman, Michael D Radmacher, Oliver A Hampton, David M McKean, Daniel R Elgort, Robert J Rounbehler, Donghai Dai, Tingyi Li, William S Dalton