抗体对细胞角蛋白免疫过氧化物酶染色，低分化肿瘤细胞呈阳性，如图所示肿瘤细胞已浸透胃壁，细胞角蛋白染色主要用于源于上皮的恶性肿瘤（癌）。
This is an immunoperoxidase stain with antibody to cytokeratin, which is positive in the poorly differentiated neoplastic cells seen here infiltrating through the gastric wall. Cytokeratin staining is typical for neoplasms of epithelial origin (carcinomas).
