MUC1 and nasal cavity polyp: Immunofluorescence staining revealed that the expression of MUC1-FL in the epithelial cells of nasal polyps with high eosinophil count (>100/high power field [HPF]) was reduced compared with that in those with low eosinophils (<100/HPF), whereas the expression of the C-terminal domain (MUC1-C) was the same in both groups (Figure 1A).