O-025Association between tumor mutation burden (TMB) and MLH1, PMS2, MSH2, and MSH6 alterations in 395 microsatellite instability-high (MSI-High) gastrointestinal (GI) tumors. (20th June 2018) - Salem, M; Grothey, A; Goldberg, R; Xiu, J; Korn, W; Shields, A; Hwang, J; Philip, P; Lenz, H; Marshall, J