Definition

A humanized immunoglobulin G1 (IgG1) monoclonal antibody against C-C-chemokine receptor 8 (CCR8), with potential immunomodulating and antineoplastic activities. Upon administration, anti-CCR8 monoclonal antibody ZL-1218 targets and binds to CCR8 on CCR8-positive tumor-infiltrating regulatory T cells (Tregs) in the tumor microenvironment (TME), and depletes CCR8-positive tumor-infiltrating Tregs via antibody-dependent cellular cytotoxicity (ADCC). 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.