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Distribution of carcinoembryonic antigen (CEA) according to TNM stage and N stage. (A) Advancement of TNM stage lowers the frequency of patients with CEA levels less than 2.5 ng/mL while it increases the frequency of patients with CEA levels equal to or higher than 10 ng/mL. (B)The range of serum CEA level moves from low to high with the progression of N stage.
