MUC6 and gastric papillary adenocarcinoma: In contrast, the expression levels of gastric mucins MUC5AC and MUC6 were significantly higher in patients with early gastric papillary adenocarcinoma and were lower or absent in those with early gastric differentiated tubular adenocarcinoma, indicating that MUC5AC and MUC6 may serve as discriminatory biomarkers for EGPA and EGDTA.