MUC4 and pachyonychia congenita: We used a well characterized KrasG12D;Pdx1-Cre spontaneous PDAC mouse model, which recapitulates human PC genetically, histologically and pathologically [40], to investigate if the expression pattern of murine mucins (i.e. Muc1, Muc4 and Muc5AC) mirrors the altered mucin profile of the human disease.