Abstract:Objective To investigate the association between Type Ⅲ collagen alpha 1 rs1800255 polymorphism and intracranial aneurysm (IA) incidence. Methods Case-control studies between rs1800255 G > A polymorphism and IA risk were searched in NCBI PubMed, CNKI and Wanfang database. Stata 12.0 software was utilzied to detect the publication bias and heterogeneity across the data. Inclusion and exclusion criteria were formulated. Results Until July 31st, 6 studies with 3,664 subjects were included. Meta-analysis showed that, in the dominant genetic model, rs1800255 G > A polymorphism was significantly associated with IA. Compared with the GG genotype, A allele carrier experienced significantly increased risk of IA with pooled O^R equal to 1.68 and corresponding 95% CI as 1.43 to 1.98. Compared with the GG+GA genotype, in the recessive genetic model, AA genotype subjects had significantly increased risk of IA with pooled O^R equal to 1.62 and corresponding 95% CI as 1.12 to 2.35. Conclusion COL3A1 gene rs1800255 G > A polymorphism may modify the susceptibility of person to IA.