Next, we examined MUC5AC expression in colon TMA, which showed a higher expression of secretory mucin MUC5AC protein in both adenocarcinoma (n = 34, p < 0.01) and metastatic adenocarcinoma (n = 20, p < 0.01) patient tissues (Fig. 1b). This evidence concerns the gene MUC5AC and adenocarcinoma.