T cell infiltration, accumulation, and survival of chimeric antigen receptor T (CAR-T) cells in solid tumors are crucial for tumor clearance. T cell infiltration assays ensure the functional T cells are located in tumor microenvironment to display humoral or cellular immunity both in vitro and in vivo. https://www.creative-biolabs.com/car-t/enhancement-or-inhibition-of-t-cell-response-assays.htm