Targeted drugs are one of the hot spots in the research of drug technology. Under the action of the external magnetic field, the drug can be moved to the lesion through the magnetic navigation of the carrier nano particles, so as to achieve the purpose of targeted treatment. This can not only greatly improve the efficiency of drugs, but also reduce the amount of drugs in other organs of the human body, so as to effectively avoid the drugs from harming other organs of the human body while acting on the focus. Magnetic iron oxide biological nanoparticles are easy to orient and have no side effects on human body. They can be used as an effective carrier for drug orientation. The magnetic particles of Fe3O4 of 10nm ~ 50nm are coated with methacrylic acid, and the size is 200 nm. These submicron particles carry proteins, antibodies and drugs, which can be used for cancer diagnosis and treatment. This local treatment has good effect and few side effects, and is likely to become the direction of cancer treatment.
