Figure 4. Expression changes of CLDN18 in precancerous tissues of the stomach. (A) The difference in CLDN18 expression between intestinal metaplasia (IM) and healthy controls. (B) The difference in CLDN18 expression among chronic gastritis (CG), low grade intraepithelial neoplasia (LGIN), high grade intraepithelial neoplasia (HGIN), and early gastric cancer (EGC). FC, fold change.