The present disclosure provides a composition for preventing or treating cancer comprising (S)—；N-(4-(3-(1H-1,2,4-triazole-1-yl)-4-(3,4,5-trimethoxy-benzoyl)phenyl)thiazole-2-yl)-2-amino-3-methylbutanamide or pharmaceutically acceptable salts thereof, and an immune checkpoint inhibitor. The composition of the present disclosure achieves an excellent cancer treatment effect.
