Wang et al. immunohistochemically investigated the expression of mucins (MUC1, MUC2, and MUC5AC) in EUS-FNA samples of pancreatic occupying lesions [26]: the prevalence of MUC1, MUC2, and MUC5AC expression in pancreatic cancers were 77.5% (31/40), 10.0% (4/40), and 80.0% (32/40), respectively, and in the benign pancreatic diseases the corresponding values were 25% (4/16), 31.3% (5/16), and 43.8% (7/16). Here, MUC5AC is linked to familial pancreatic carcinoma.