(A) Expression of mesothelin and TGF-β1 on PDX tumor 2. Scale bar: 200 μm. (B) Fold change of tumor volume after i.t. CAR T cell administration in PDX model 2. (C) Fold change of tumor volume after PDX tumor 2 reinoculation. (D) Tumor sizes and weights were detected at the end of the PDX tumor 2 reinoculation experiment. M28z-TKO, TGFBR2-KO M28z; i.t., intratumor; PB, peripheral blood; un, undetectable. Mean ± SD, n = 5, except in D. Two-way ANOVA and Tukey’s multiple comparisons test were used in B and C. Unpaired t test was used in D.