| abstract |
The present invention relates to a bi-specific antibody, which specifically guides a therapeutic agent to a cancer cell, by targeting a tumor antigen of a cancer cell, thereby inhibiting the growth of cancer cells or blocking the invasion or metastasis of cancer cells . The bifunctional antibody of the present invention includes a first antigen-binding site, which binds to polyethylene glycol (PEG); and a second antigen-binding site, which binds to a target ligand, Such as a tumor antigen. |