TGFB1 and cancer: Transforming growth factor‐β (TGF‐β) is widely upregulated in several human cancers31 and could promote invasion and metastasis by inducing EMT in cancer cells,32 while the phosphorylation of Smad proteins plays a key role in the TGF‐β pathway.33 These data suggested that Slit2 may inhibit migration and EMT via inhibiting TGF‐β pathway in GC.