CXCR4 and esophageal squamous cell carcinoma: Unconditional logistic regression analyses showed that the odds of having the CXCR4 rs6430612 CT genotype in ESCC patients was 0.40 (95% CI = 0.25-0.62, P = 4.7×10-5) compared with carriers of the CC genotype in the Jiangsu set (Table 2).