In AGS CSCs, DSBCl reduced CD24 expression and downregulated the expression of genes, including ID1, BCL2L2, ABCC2, NANOG, and OCT4, while it upregulated KLF17, BAX, and KLF4. In KATO III CSCs, DSBCl increased ID1 and MYC but decreased BCL2L1 and BAX. These findings suggest that DSBCl modulates critical markers and genes in gastric CSCs, highlighting its potential for gastric cancer treatment. Here, KLF4 is linked to gastric cancer.