MUC5AC and gastric carcinoma: However, recent mucin histochemical and immunohistochemical examinations have demonstrated that gastric and intestinal phenotypic cell markers are widely expressed in gastric carcinomas, irrespective of their histologic type (Tatematsu et al, 1990; Egashira et al, 1999; Endoh et al, 1999, 2000; Koseki et al, 2000; Saito et al, 2001; Tajima et al, 2001a, 2001b, 2003; Tsukashita et al, 2001; Kabashima et al, 2002; Shibata et al, 2003).