Fig. 1

Juvenile polyp with carcinogenesis. A Haematoxylin and eosin staining (A1 × 40; A2 × 100). B Immunohistochemical staining for p53 showed p53 mutation and overexpression (B1 × 40; B2 × 100). C Immunohistochemical staining for Ki-67 showed an index of 80% (C1 × 40; C2 × 100)