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AIM To study the expression of cathepsin B in gastric carcinoma and its relationship with pathologic type.METHODS The cathepsin B expression in 54 specimens of human gastric adenocarcinoma was studied byimmunohistochemistry.RESULTS The cathepsin B expression was detected in 33/54 (61.1%) specimens of human gastriccarcinoma and in 3/54 (5.6%) of normal tissue (P<0.01). There was no obvious correlation between theexpression of cathepsin B and pathologic type of gastric adenocarcinoma.CONCLUSION There is a high expression of cathepsin B in human gastric adenocarcinoma.