C1S and colorectal carcinoma: The five proteins UCHL1 (FC = 39.9), C1S (FC = 10.4), CTBS (FC = 8.5), NAGA (FC = 3.1), and PROCR (FC = 9.2) were the most significantly upregulated in the secretome samples of lung origin as compared to the secretome samples derived from CRC cell lines (listed in order of decreasing significance).