In the present study, we first analyzed the tumor and adjacent non-tumor tissues of the GC patient cohorts and the biopsy tissues of the FD patients to measure the relative mRNA expression of gastric (MUC1, MUC5AC, MUC6) and intestinal (MUC2, MUC4, MUC13) mucins. The gene discussed is MUC1; the disease is neoplasm.