C1QA and central nervous system cancer: Bouwens et al. (2015) found the concentration of C1q increased in the blood of glioma patients. Next, Mangogna et al. searched the Oncomine, UALCAN, and CGGA databases and found that the C1QA, C1QB, and C1QC genes, which encode the three chains of C1q, were all highly expressed in gliomas. Furthermore, the high levels of expression for these three genes were associated with poor prognosis. These conclusions were verified by immunohistochemistry and immunofluorescence (Mangogna et al., 2019b).