According to Pearson’s correlation test, 20 cases of positive expression and 13 cases of negative expression of SDC4 and DDX23 were obtained in a total of 41 cases of HCC tissues, suggesting a positive correlation between SDC4 and DDX23 (r = 0.598, P < 0.001) (Table S3). The gene discussed is DDX23; the disease is hepatocellular carcinoma.