CTLA4 and neoplasm: Furthermore, the method of long-term intravital imaging of various immune cells in the tumor microenvironment in vivo is also suitable for monitoring multiple immune reactions, studying the spatio-temporal cellular events of other immunotherapies, such as checkpoint inhibitors (CTLA-4 antibody and PD-1/PD-L1 antibodies), and comparing the efficacy of classical immunotherapies (such as the CTX-ACT combined treatment) and checkpoint inhibitors in the treatment of different tumor models.