C9 and diffuse large B-cell lymphoma: Moreover, similar to most of the solid tumors, DLBCL also shows higher expression of C3, ITGB2, as well as genes of the classical pathway (i.e.C1QA, C1QB, C1QC, C1R, C1S, and C2), while the C4BP, lectin pathway genes (i.e.MBL2, FCN, and MASP2), and the terminal pathway genes (i.eC6, C8. and C9) are poorly expressed.