The luciferase activity of Sox4-WT was suppressed by miR-138-5p-mimics (Figure 4D), and qRT-PCR and WB detection revealed that Sox4 protein and mRNA in gastric carcinoma transfected with miR-138-5p-mimics were obviously inhibited in SGC-7901 and MGC-803 cells (Figures 4E, F), indicating that miR-138-5p can target Sox4. Here, SOX4 is linked to gastric carcinoma.