CXCR4 and liver cancer: As shown in Supplementary Table 1, the level of cytoplasmic CXCR4 expression closely correlated with tumour size (P=0.003, χ2-test), venous invasion (P=0.006, χ2-test), high Barcelona Clinic Liver Cancer stage (P=0.003, χ2-test) and Tumour, Node, Metastasis (TNM) stage (P<0.001, χ2-test).