MUC5AC and pancreatic adenocarcinoma: Several papers have described the relationship between mucin and pancreatic cancer, for example, de novo expression of MUC5AC frequently occurs in intraductal papillary mucinous tumors and pancreatic adenocarcinoma [6-8], while Takikita et al. reported that borderline statistically significant associations are seen between expression of MUC5AC and shorter survival time in patients with pancreatic cancer [8].