This is a single arm, open-label, pilot study to determine the safety and feasibility of combination CARTmeso cells and CART19 cells in patients with pancreatic cancer following lymphodepletion with cyclophosphamide. Both cells contain CAR proteins consisting of a murine-derived single chain antibody fragment (scFv), cluster of differentiation antigen 137 (41BB) co-stimulatory domain and cluster of differentiation antigen 3 zeta chain (CD3ζ) signaling domain transduced by lentivirus