Interestingly, in the nonadenoma group that included NCF, BP, and HP, IgG correlated negatively with its antigen sCD26 (R = −0.348, p = 0.019, Figure 2(e) lower row) and almost correlated with DPP4 activity (R = −0.284, p = 0.062). The gene discussed is DPP4; the disease is hyperplastic polyp.