Immunohistochemical examination of CDH1 protein expression in sporadic gastric cancers. Representative gastric cancer samples are shown. (A) and (C), sporadic gastric cancer showing CDH1 protein expression; (B) and (D), sporadic gastric cancer not showing CDH1 expression. (A) and (B), H-E stained; (C) and (D), immunostained for CDH1. Scale bar, 50 μm.