We used KRAS Lung Adenocarcinoma (KLA) isogenic cell lines….Omomyc significantly reduced in vitro cell growth and changed the cell cycle profile of all KLA cell lines. Even more remarkably, systemic MYC inhibition in C57BL/6x129/Sv mice also displayed therapeutic efficacy in vivo and changed the tumor immune microenvironment in KRAS-mutated tumors.