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Background CD26 is an ectoenzyme with dipeptidyl peptidase 4 (DPP4) activity expressed on a variety of cell types. Considering that serum CD26 levels have been previously associated with different cancers, we examined the potential diagnostic value of serum CD26 levels in gastric cancer. Methods Soluble serum CD26 levels were measured in pre and postoperative serum samples of 30 patients with gastric...