Flow cytometry of dissociated cells from tumors demonstrated the increase in FAP-CAR T cell infiltration over time correlated with a progressive reduction in FAP+ cells (Fig. 2f [top and middle panels] and Supplementary Fig. 5d), whereas the reduction in mesothelin+ cells was more modest and not evident until day 7 post-administration of FAP-CAR T cells (Fig. 2f [bottom panel] and Supplementary Fig. 5e), consistent with an indirect inhibition of FAP-CAR T cells on the growth and/or survival of FAP-negative tumor cells compared to their effect on FAP+ stromal cells. This evidence concerns the gene MSLN and neoplasm.