WT1 and liver cancer: To determine the correlation between WT1 mRNA and WT1-AS expression, we performed correlation analysis using Gene Expression Profiling Interactive Analysis (GEPIA; http://gepia.cancer-pku.cn/, an online database based on TCGA), and we found that WT1 expression is significantly positively correlated with WT1-AS expression in most tumors, which is consistent with the findings of previous studies (including liver cancer) but not with the results of Lv et al. (16) (Figure 2).