Definition

A human immunoglobulin G1 (IgG1) nonfucosylated (NF) monoclonal antibody against C-C-chemokine receptor 8 (CCR8), with potential immunomodulating and antineoplastic activities. Upon administration, anti-CCR8 monoclonal antibody BMS-986340 targets, binds to and blocks the activity of CCR8 on CCR8-positive tumor-infiltrating regulatory T cells (Tregs) in the tumor microenvironment (TME) and prevents chemokine ligand 1 (CCL1)-CCR8-mediated signaling. BMS-986340 eliminates CCR8-positive Tregs via the induction of Fc-mediated antibody-dependent cell-mediated cytotoxicity (ADCC), thereby depleting CCR8-positive Tregs. This may reactivate antitumor immune responses. CCR8 is specifically expressed by tumor-infiltrating Tregs in multiple types of cancer and plays a key role in immunosuppression. High expression is correlated with poor prognosis.