746 Cancer cachexia associated Fc receptor expression on leukocytes as potential mechanism of checkpoint inhibitor resistance in patients and in murine cancer models by Justin Thomas, Thomas Mace, Mitch Phelps, Trang Vu, Dwight Owen, Bryan Remaily, Kyeongmin Kim, Zhiliang Xie, Samuel Kulp, Hannah Lathrop, Camille Stanton, Millenium Manna, Lauren Granchie, Yizhen Guo, Latha Ganesan, Chris C Coss