MUC5AC and diabetes mellitus: Interestingly, only a few significant associations between mucin mRNA expression and the presence of a comorbidity were found, including MUC4 mRNA expression with lymphoproliferative disease, MUC5B, and MUC6 mRNA expression with hypertension, MUC16 mRNA expression with malignancy, and MUC20 mRNA expression with diabetes (Figure 7A).