219 Prevalence of genomic alterations in XernaTM tumor microenvironment subtypes in colorectal cancer patients by Laura Benjamin, Mark Uhlik, Frederick L Baehner, Jessica Aldrich, Luka Ausec, Gargi D Basu, Janine LoBello, Snehal G Thakkar, Matthew Halbert, Patrick Eimerman, Cynthia A Flannery, Nishitha Therala, David W Hall, Daniel Pointing, Lea Vohar, Roman Lustrik, Seema Iyer