SDC3 and gastric adenocarcinoma: Among these three miRNAs, only miR-138-5p has published evidence that it was directly targeted by lncRNA TRPM2-AS and thus regulating downstream signaling, e.g., PI3K/AKT in non-small cell lung cancer, syndecan 3 (SDC3) in ovarian cancer, and urokinase in gastric adenocarcinoma [20,21,26].