CCR9 and hepatocellular carcinoma: In TCGA cohort, CCR1 (AUC=0.833, Supplementary Figure 1K) and CCR9 (AUC=0.835, Supplementary Figure 1S) were exhibited satisfactory diagnostic performance in HCC, while the diagnostic efficiency of the other CCR family members (Supplementary Figure 1L–1R, 1T) were not satisfactory.