MUC5AC and neoplasm: In principle, these findings are concordant with the literature, as several earlier reports have already described most of these tumor entities to express MUC5AC.9,10,13,14,19,23,25,28,32–37 However, the large number of analyzed tumor entities in our study allowed us to identify 22 tumor categories that can express MUC5AC but were never described to do so earlier.