This product is a research-grade biosimilar of azirkitug, an anti-CCR8 monoclonal antibody developed as an investigational cancer immunotherapy (also known by the code ABBV-514). It is supplied as an unconjugated, non-therapeutic analog built around the same target, CCR8 (human, UniProt P51685), and is intended strictly for research use only; it is not a clinical drug and is not for diagnostic or therapeutic application. The originator antibody was designed to engage CCR8 on tumor-infiltrating regulatory T cells, where the goal is to reprogram or deplete an immunosuppressive population within the tumor microenvironment, either alone or in combination with PD-1 pathway blockade. As a biosimilar reagent, this material recapitulates the binding specificity of the parent molecule and is useful as a reference antibody, positive control, and tool for characterizing CCR8 biology in vitro. It carries a human IgG1/kappa framework. Manufactured to research-grade specifications with low endotoxin (<1 EU/mg), it is available in bulk milligram-to-gram quantities to support assay development, screening, and comparability work. It offers a citation-supported, cost-effective alternative for laboratories studying CCR8-directed approaches.
CCR8 (C-C chemokine receptor type 8) is a seven-transmembrane G protein-coupled receptor whose principal ligand is the chemokine CCL1. It was originally characterized in the context of T-helper type 2 responses, thymic development, and T-cell trafficking to the skin. In oncology, CCR8 has become a target of intense interest because it is preferentially and highly expressed on tumor-infiltrating regulatory T cells (Tregs), while being largely absent from peripheral and other tissue Tregs. These intratumoral Tregs are strongly immunosuppressive, and high CCR8 expression correlates with poor prognosis in cancers including non-small cell lung and colorectal cancer. This restricted expression pattern makes CCR8 an attractive handle for selectively targeting the suppressive Treg compartment inside tumors while sparing systemic immune regulation, motivating antibody strategies that deplete or functionally impair CCR8-positive Tregs to relieve suppression of anti-tumor immunity.