CXCR2 and esophageal squamous cell carcinoma: We have demonstrated a significant correlation between CXCR2 expression and cancer cell MMP9 in ESCC tissues (p = 0.010) through IHC, and the expression ratio of CXCR2 to CXCR1 was the highest in TE-10 among the three ESCC cell lines on Western blot.