Definition

A humanized immunoglobulin (lg) G1 monoclonal antibody directed against the human epidermal growth factor receptor 2 (HER2), with potential immunomodulating and antineoplastic activity. Upon administration, anti-HER2 monoclonal antibody HLX22 targets and binds to HER2 on tumor cell surface. This may induce a cytotoxic T-lymphocyte (CTL) response as well as an antibody-dependent cell-mediated cytotoxicity (ADCC) against tumor cells that overexpress HER2. HER2, a tyrosine kinase receptor, is overexpressed by many cancer cell types.