First, correlation analysis determined significant correlation of 18 proteins with cancer-associated inflammation, including 9 proteins correlated positively such as C8A, A2GL, and ceruloplasmin (CERU), while another 9 proteins including retinol-binding protein 4 (RET4) were correlated negatively (Figure 4A, Supplemental Table S5). Here, RBP4 is linked to cancer.