CCR5 and esophageal squamous cell carcinoma: The expression levels of CCR1 in TE-8 (1.3 ± 0.1-fold, p = 0.017), TE-9 (1.4 ± 0.1-fold, p = 0.010), and TE-15 cells (1.3 ± 0.0-fold, p = 0.008) were also significantly higher than that in the Het-1A cells (1.0 ± 0.0-fold), but relatively much lower than the CCR5 expression levels in the three ESCC cell lines (Fig. 2b, c).