Multivariate linear regression analysis results for brain aneurysm size revealed that: (1) with an increase in IL-8 concentration in CSF by 10 pg/mL, the aneurysm size increases by 1.15 times (rises by 15%); (2) with an increase in BMI by 1, the aneurysm size increases by 1.03 times (rises by 3%) (Table 5). This evidence concerns the gene CXCL8 and aneurysm.