MUC5AC and pancreatic neoplasm: The apomucins MUC1, MUC5B, MUC5AC, and MUC6 are expressed in the normal pancreas; MUC1, MUC2, and MUC4 are upregulated in pancreatic tumours (Andrianifahanana et al, 2001), whereas MUC5B, MUC5AC, and MUC6 are slightly downregulated.