C5AR1 and neoplasm: However, C5aR expression did not show a significant correlation with tumor stage (OR = 1.47, 95%CI: 0.93–2.34, P = 0.102), vascular invasion (OR = 1.66, 95%CI: 0.55–5.01, P = 0.368) and tumor differentiation (OR = 1.10, 95%CI: 0.74–1.62, P = 0.646).