TRPM7-IN-1 (compound SUD), a benzoylurea derivative, is an effective TRPM7 inhibitor. TRPM7-IN-1 induces cell cycle arrest and apoptosis , decreases the migration of MCF-7 and BGC-823 cells. TRPM7-IN-1 decreases vimentin expression and increases E-cadherin expression. TRPM7-IN-1 potentially reduces the TRPM7-like current and decreases TRPM7 expression through the PI3K/Akt signaling pathway. TRPM7-IN-1 is a potential agent to suppress the metastasis of breast and gastric cancer by inhibiting TRPM7 expression and function.