Diabetes is now still an incurable disease. Beta cell failure is one of common causes. No drugs for this failure have been developed. This invention is to developapply PS1 to treatreverse diabetes. PS1 is a first-in-class small-molecule drug, which targets beta cells by improving their survivalfunction. As a result, PS1 can treatreverse diabetes. The anti-diabetic mechanism of

DBPR807 can significantly suppress tumor growth, prevent distant metastasis, reduce angiogenesis, normalize tumor microenvironment and promote cytotoxic T-cell infiltration. In various HCC models, DBPR807 itself can prolong overall survival as effectively as marketed anti-angiogenic agent sorafenib and immune checkpoint inhibitor anti-PD-1 Ab. What’s more, its combination therapy with either sorafenib or anti-PD-1 Ab can extend life expectancy even more significantly than aforementioned monotherapy.