Biological therapy refers to the use of biological response modifiers. Biological therapy is often used in the treatment of tumors. Through biological therapeutic methods, such as biological agents, chemical agents and biotechnological methods, the immune system in the patient’s body can be activated, and at the same time, it can also increase the recognition ability of human immune cells to tumor cells and the ability to kill them, so as to achieve the purpose of treating tumors. Compared with traditional surgical treatment, radiotherapy, chemotherapy and other treatment methods, biological therapy has stronger tumor killing specificity and less toxic side effects. Biological therapy is mainly suitable for a variety of solid tumors, such as prostate cancer, malignant melanoma, bladder cancer, kidney cancer, etc. Some adverse reactions may occur after treatment, such as redness of the skin, hard spots, etc., and if the adverse reactions are obvious, it may be necessary to suspend the treatment.