MUC5AC and cancer: MUC5AC expression was earlier described to occur in 0–95% of colorectal cancers in studies analyzing 22–649 cancers [11, 12, 15–35], and it was shown to be linked to MSI or dMMR in studies analyzing 35–649 cancers [16–18, 20, 22, 26, 28, 30, 33, 34].