FOXS1 and gastric cancer: Unexpectedly, NFKB1 inhibited luciferase activity driven by F1100 in HGC-27 cells but slightly increased luciferase activity driven by F1100 in SGC7901 cells (Supplementary Fig. S9B), suggesting that NFKB1 regulates FOXS1 expression in a manner dependent on the type of gastric cancer cells.