Figure 5From: CA19-9-Producing early gastric adenocarcinoma arising in hyperplastic foveolar polyp: a very unique resection caseMicroscopic examination of the adenocarcinoma arising in polyp by mucin immunohistochemical methods. Not only the hyperplastic (left) but the atypical (right) epithelium is also positive for MUC5AC in immunohistochemistry whereas negative for MUC2 or CD10, classified into pure gastric phenotype.Back to article page