T lymphocytes are mainly involved in the cellular immune process in the body, but they can also assist B lymphocytes in the humoral immune process and have an immunomodulatory role, and can be divided into various subsets such as helper T cells, suppressor T cells and cytotoxic T cells. thus directly killing the target cells. In addition, T cells can release lymphokines, which enhance the immune effect of the body and are therefore important for disease protection. Currently, T-cell immune-based biotherapy has become a new treatment modality for tumors after surgery and radiotherapy.