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  • A recombinant humanized immunoglobulin G4 kappa (IgG4k) monoclonal antibody directed against B- and T-lymphocyte attenuator (BTLA), with potential immunomodulating and antineoplastic activities. Upon intravenous infusion administration, icatolimab targets and binds to BTLA. This prevents BTLA-mediated inhibition of T-cell activation leading to antigen specific T-cell proliferation and activation of a cytotoxic T-lymphocyte (CTL)-mediated immune response against tumor cells. BTLA, an immunoglobulin (Ig) receptor family member expressed on activated T- and B- lymphocytes, subsets of dendritic cells (DCs), macrophages, and nature killer (NK) cells, is an immune checkpoint involved in suppressing immune responses. It mediates inhibition of human tumor-specific CTLs upon engagement by tumor expressed herpesvirus-entry mediator (HVEM).
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