We cross‐validated the upregulated genes with an RNA microarray dataset that contains 39 primary CRC and 74 liver metastases from stage IV CRC patients (GEO:GSE41568).[24] DPP4 and MAF were the most upregulated in the liver metastases in all three datasets (Figure 2B,C, and Figure S2A, Supporting Information). Here, DPP4 is linked to colorectal carcinoma.