C9 and neoplasm: P3 tumours also showed an increase in the expression of proteins related to the acute inflammatory response, such as C‐reactive protein (CRP) or protein serum amyloid A‐1 (SAA1) (Figure 5B), as well as increased expression of proteins related to the complement activation pathway, such as the complement (C9), plasminogen (PLG), subunit A, B and C of component C1q of complement (C1QA, C1QB and C1QC), and fibrinogen α chain (FGA) (Figure 5C).