Immuneering Announces Its Atebimetinib's Data Shows Improvement In Activity Of PD-1 Checkpoint Blockade In RAS-Mutant Colorectal And Lung Cancer Models; Demonstrates 50% Durable Complete Regression In Colorectal Model

Immuneering Corporation (NASDAQ:IMRX), a late-stage clinical oncology company focused on keeping cancer patients alive and helping them thrive, today announced compelling preclinical data demonstrating that atebimetinib, the Company’s novel Deep Cyclic Inhibitor of MEK, enhanced the activity of PD-1 checkpoint blockade in RAS-mutant colorectal and lung cancer models, including a 50% durable complete regression rate in a colorectal model and a 1.8-fold median survival improvement with a triple combination in a lung model. The data are being presented at the Society for Immunotherapy of Cancer (SITC) 41st Annual Meeting, taking place November 4-8, 2026, in Phoenix, Arizona.