胃腺癌对免疫过氧化物酶染色反应呈角蛋白阳性，这是癌的典型染色反应，用于癌与肉瘤、淋巴瘤的鉴别。 当依赖分化程度或单纯从形态学角度不能进行精确分类时，免疫过氧化物酶染色有助于判断肿瘤细胞的类型。

This gastric adenocarcinoma is positive for cytokeratin by immunoperoxidase（免疫过氧化物酶）. This is a typical staining reaction for carcinomas and helps to distinguish carcinomas from sarcomas and lymphomas. Immunoperoxidase staining is helpful to determine the cell type of a neoplasm when the degree of differentiation, or morphology alone, does not allow an exact classification.