Monoclonal antibodies are targeted to attack and kill cells that express specific antigens. Therefore monoclonal antibody drugs will have fewer side effects than other anti-tumor drugs during use. Because it kills fewer normal cells, it has fewer side effects and will cause less damage to the body. It can be targeted to kill specific tumor cells, so its therapeutic effect will be better. Monoclonal antibody drugs, which may not target only one type of tumor, can be used to treat any tumor cells that express this specific antigen. Therefore, monoclonal antibody drugs can be widely used in the treatment of many kinds of tumors in clinical practice.