FOLR1 and neoplasm: Compared with Tandem-CAR and FOLR1-CAR T cells, MSLN-CAR T cells showed lower antitumor activity and only achieved a transient reduction in the tumor burden (p <0.001, p <0.01, Figure 6E), which was consistent with the total fluorescence intensity data (p <0.0001, p <0.05, Figure 6C).