MUC5AC and neoplasm: This isin line with two earlier studies also failing to find associations between MUC5ACexpression and pancreatic tumor phenotype.13,15 One other study investigating134 patients found a link between high MUC5AC expression and high tumor grade,presence of lymph node metastasis, and venous invasion,14 and one study on ampulla Vateri cancers reported that MUC5AC expression wasnot only strongly associated to the pancreato-biliary phenotype, but also correlatedwith poor clinical outcome,38 however.