Fig. 4

Glandular atrophy proliferation and transformation, a: significant proliferation in the proliferation area or proliferation band area of the deep gastric pits, and the isthmus and neck of the gastric glands. Formation of single ducts or multiple ducts, or proliferation of patchy cells. The hyperplastic glands are slightly expanded. H&E staining (× 40). b: positive expression of CK20. EnVision method (× 40)