Moreover, as shown in Figure 3(a), c-MYC and CXCR4 were able to identify patients with polyp from normal subjects with AUC values of 0.75 and 0.73, respectively, whereas Oct4 and CD26 can identify CRC patients from polyp patients with AUC values 0.80 and 0.71 (Figure 3(b)), respectively (all p < 0.05). This evidence concerns the gene DPP4 and colorectal carcinoma.