MSLN and neoplasm: Consistent with our previous results described above, we found significantly more GFP+ FAP-CAR T cells accumulated in both stromal cell-rich and tumor nest regions at day 1, 4 and 7 post-second treatment compared with GFP+ MigR control and Meso-CAR T cells, resulting in the rapid ablation of FAP+ stromal cells and mesothelin+ tumors cells (Fig. 7b, c and Supplementary Fig. 11a, b).