#$%^&*AU2020200953A120200227.pdf#####Abstract The present invention discloses a method of treating, preventing or ameliorating tumor growth by administering a therapeutic agent that selectively inhibits dipeptidyl peptidase including fibroblast activation protein and dipeptidyl peptidase 8/9 in combination with an immune checkpoint inhibitor. The method specifically discloses use of Talabostat in combination with an immune checkpoint inhibitor, its pharmaceutical composition and process ofpreparing such composition. 85