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Ki67 labeling index in gastric adenocarcinoma according to expression of (a) 15‐hydroxyprostaglandin dehydrogenase (15‐PGDH), (b) cyclooxygenase‐2 (COX‐2), and (c) expression of 15‐PGDH in subgroups of patients with COX‐2‐positive and ‐negative tumors. Values are the mean ± SD.
