XRCC1 and esophageal squamous cell carcinoma: A case-control study of Liu et al. [32] in Hebei population of China found that the mutation homozygous genotype (TT) of XRCC1 codon 194 can increase individual risk of ESCC 0.86-fold (adjusted OR (95% CI): 1.86 (1.19–2.88)).