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Forest plots of age, gender, smoking status, alcohol intake status, biomarker levels, and SHOX2, RNF180, SEPTIN9, and EPO methylation in screening patients with esophageal cancer. Variables are on the left axis, while P values are on the right. OR: Odds ratio; SCCA: Squamous cell carcinoma antigen; CEA: Carcinoembryonic antigen; CA199: Carbohydrate antigen 199.
