Definition

A human monoclonal antibody directed against CD25 (interleukin-2 receptor subunit alpha; IL-2R alpha; IL-2Ra), with potential antineoplastic activity. Upon administration, anti-CD25 monoclonal antibody BA1106 targets and binds to CD25 expressed on tumor-infiltrating regulatory T (Treg) cells. This may deplete Treg cells in the tumor microenvironment (TME) through antibody-dependent cellular cytotoxicity (ADCC) and prevent immunosuppression, thereby increasing the number of effector T (Teff) cells and enhancing anti-tumor immune responses. CD25, the alpha chain of the IL-2 receptor, is highly expressed on Treg cells but not on Teff cells in tumors.