CAR-T cell preclinical in vivo animal testing performed in xenograft murine models derived by well-defined cell lines or primary human tumor cells. Immunodeficient mice, lacking of effective innate immunity for the absence of B cells, T cells, or NK cells, are the optimal animal models for engraftment of tumor cells and evaluation of CAR-T cells. https://www.creative-biolabs.com/car-t/car-t-preclinical-in-vivo-assay.htm