In UIA individuals, correlation coefficient analysis revealed: positive correlation between CSF IL-8 concentration and aneurysm size (R = 0.41, p = 0.04), and positive correlation between both CSF and serum MCP-1 concentrations and the aneurysms number (R = 0.43, p = 0.032 and R = 0.40, p = 0.049, respectively). This evidence concerns the gene CXCL8 and aneurysm.