DPP4 and colorectal carcinoma: Consistent with RNA‐seq and ATAC‐seq profiling results, ChIP‐qPCR confirmed that histone activation markers H3K27ac, H3K4me1, H3K4me3, and H3K9ac in the DPP4 promoter were significantly elevated in CRC liver metastases compared to primary CRC (Figure 2L,M).