The MUC4 mucin exhibits a pancreatic tumour-associated expression, with no detectable expression in a normal pancreas (Balague et al, 1994; Hollingsworth et al, 1994; Kim et al, 1999; Choudhury et al, 2000a; Andrianifahanana et al, 2001). The gene discussed is MUC5AC; the disease is pancreatic neoplasm.