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.

• 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。