Favezelimab (MK-4280) is a humanized monoclonal antibody targeting LAG-3. Favezelimab blocks the interaction between LAG-3 and its ligand MHC class II. Favezelimab has the potential for colorectal cancer (CRC) research in combination with the PD-L1 inhibitor Pembrolizumab . Recommend Isotype Controls: Human IgG4 (S228P) kappa, Isotype Control .