Humanized 3D tumor models revealed a promising sensitivity profile for IMM-6-415 in RAS-mutant CRC and PDAC….We demonstrate that IMM-6-415 displays single-agent activity in multiple RAS-mutant models, has a 0.3h half-life, is well tolerated in mice, and when combined at sub-MTD levels with either PD1 or CTLA4 checkpoint inhibitors, significantly improved responses in the CT-26 model (p-value < 0.05).