GTSE1-IN-1 is an orally active GTSE1 inhibitor. GTSE1-IN-1 can suppress GTSE1 transcription and expression. GTSE1-IN-1 can inhibit cancer cell proliferation by inducing cell cycle arrest and cell senescence through the persistence of DNA damage. GTSE1-IN-1 can be used for the research of cancer, such as colon and lung cancer[1].