MUC5B and cancer: Most patients were in stage II (33.3%), and only 6.7% of patients showed stage IV (Table-2).Comparison of Gene Expression in Normal and Cancer Cells Significant differences were observed in the expression of MUC2, MUC5A, and MUC5B genes between normal and tumor cells so that the expression of MUC2 and MUC5A genes in normal cells was higher than in tumor cells, while tumor cells showed a higher expression of the MUC5B gene than normal cells (Figure-1).MUC5A Expression The results showed that there was a significant difference in the expression of this gene in terms of patient age (P<0.05).