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Forest plot. Univariate Cox regression analysis for disease-free survival. The following reference categories were used: “female” for gender; “Pen B” for Kodama classification; “antrum” for tumor location; “intestinal” for Lauren classification; “G1+G2” for grade; “N0” for lymph node status; “Absent” for lymphovascular invasion. Age, Tumor size, and lymph node ratio are reported as continuous variables. HR hazard ratio, CI confidence interval, p p-value
