COL4A1 and gastric cancer: However, further in vivo and in vitro investigations are required to validate whether there is positive feedback between lncRNA SND1-IT1 and TGFβ1, negative feedback between miR-124 and TGFβ1, and a ceRNA regulatory network of lncRNA SND1-IT1, miR-124, and COL4A1 in mediating the process of EMT in GC and all these regulatory mechanisms to explain TGFβ1-induced EMT in GC.