For the variables CSF IL-8 concentration, serum IL-8 concentration, IL-8 Quotient, CSF MCP-1 concentration, serum MCP-1 concentration, MCP-1 Quotient, age, sex, and brain aneurysm risk factors (obesity, systolic blood pressure, diastolic blood pressure, and smoking) a multivariate logistic regression model was sought, but nothing of significance was discovered. The gene discussed is CXCL8; the disease is brain aneurysm.