The PrognoScan showed that increased CD55 expression level is connected with a high hazard ratio for DFS in CRC patients (Figures 3I, J), Depending on the TCGA database examined with Kaplan-Meier plotter, increased C3, CR4, and C5aR1 expression was related to a poor prognosis in GC (Figures 3M–R). The gene discussed is C3; the disease is gastric cancer.