Sulfatase 2-Induced Carcinoma-Associated Fibroblasts Promoted Epithelial-to-Mesenchymal Transition of Hepatocellular Carcinoma Cells by Upregulating SNAI1 and Activating the SDF-1/CXCR4 Signaling Pathway. This evidence concerns the gene SNAI1 and hepatocellular carcinoma.