PSGL-1 (P-selectin glycoprotein ligand-1) is an adhesion molecule that is involved in immune cell trafficking in response to tissue injury or inflammation. Verseau discovered that modulation of PSGL-1 can lead to macrophage reprogramming. Proprietary PSGL-1 monoclonal antibodies induce tumor microenvironment activation, T-cell activation and naïve immune cell recruitment amounting to a coordinated immune attack on tumors. In patient-derived primary tumors, PSGL-1 antibodies demonstrate a greater inflammatory response compared to current immunotherapies in both PD-1 responsive and non-responsive tumors. Given the prominent role of PSGL-1 in many tumor types, Verseau has selected PSGL-1 as the lead macrophage checkpoint modulator (MCM) program for clinical development.