HP590 (0-40 μM; 72 h) shows anti-proliferative activities to MKN45, AGS, and MGC803 cells.HP590 (0-40 nM; 0-24 h) inhibits STAT3 Tyr and Ser phosphorylation in GC cells, blocks the expression of STAT3 downstream genes (c-Myc and cyclin D1) in GC cells, reduces IL-6-mediated STAT3 nuclear translocation in MKN45 cells.HP590 (5-20 nM; 48 h) induces gastric cancer cell apoptosis. has not independently confirmed the accuracy of these methods. They are for reference only.