Genotype frequencies of MDM4 rs4245739 polymorphism among patients and controls and their association with ESCC risk.

Note: ESCC, esophageal squamous cell carcinoma; NC, not calculated; OR, odds ratio; CI, confidence interval.aData were calculated by logistic regression with adjustment for age, sex, smoking and drinking status.bTest for trend of odds was two-sided and based on likelihood ratio test assuming a multiplicative model.