| abstract |
The present invention provides a bifunctional antibody comprising a first antigen binding site that binds to polyethylene glycol (PEG); and a second antigen binding site that binds to a target ligand, such as A tumor antigen. The invention also provides the use of a bifunctional antibody for the treatment of cancer, wherein the bifunctional antibody can specifically guide a therapeutic agent to a cancer cell through a tumor antigen targeting a cancer cell, thereby inhibiting the growth of the cancer cell or blocking the invasion Cancer or metastasis. |