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37.This gastric adenocarcinoma is positive for cytokeratin by immunoperoxidase. 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.

37.图示免疫酶原染色下胃腺癌的胞浆角蛋白，此为癌的典型染色反应，可鉴别肉瘤与淋巴瘤。尤其当从分化程度和形态不能准确分类时有帮助。