Cemiplimab (REGN2810, Libtayo) is a humanized, hinge-stabilized, IgG4K monoclonal antibody (mAb) designed to target PD-1-expressing cells, including T cells, and sustain or restore their effector function by blocking checkpoint inhibitory interactions between PD-1 and its ligands (PD-L1 and PD-L2). It has received approval for the treatment of patients with metastatic or some locally advanced cutaneous squamous cell carcinomas.
REGN3767 is a fully human, hinge-stabilized IgG4 monoclonal antibody (mAb) that binds with high affinity to LAG-3 and blocks this pathway of inhibitory T-cell signaling.
Preclinical and preliminary clinical evidence has shown the combination of cemiplimab plus REGN3767 has antitumor activity can result in objective responses across several tumor types.