For example, Yamanoi et al. [18] reported that diminished αGlcNAc expression on MUC6 in precancerous lesions in the stomach (gastric gland mucin), pancreas (IPMNs), and esophagus (Barrett’s esophagus) is an early event indicative of tumor progression. Here, MUC6 is linked to esophageal adenocarcinoma.