Antitumor agent-37 possesses potent anti-proliferative and anti-metastasis activities. Antitumor agent-37 induces serious DNA damage and further leads to high expression of γ-H2AX and p53. Antitumor agent-37 promotes apoptosis of tumor cells through mitochondrial apoptotic pathway Bcl-2/Bax/caspase3. Antitumor agent-37 significantly improves immune response through restraining the expression of PD-L1 to increase CD3+ and CD8+ T infiltrating cells in tumor tissues.