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Matrix metalloproteinases-2 (MMP-2) plays an important role in the pathogenesis of type A aortic dissection (AD). The aim of this study was to evaluate the association of 3 single nucleotide polymorphisms (SNPs) in the  MMP-2  gene with type A AD risk and aortic diameters in patients. We performed a case–control study with 172 unrelated type A AD patients and 439 controls. Three SNPs rs11644561, rs11643630, and rs243865 were genotyped through the MassARRAY platform. Allelic associations of SNPs and SNP haplotypes with type A AD and aortic diameters in patients were evaluated. The frequency of the G allele of the rs11643630 polymorphism was significantly lower in type A AD patients than in control subjects (odds ratio 0.705, 95% confidence interval 0.545–0.912,  P  = 0.008). The association remained significant after adjusting for clinical covariates ( P  = 0.008). Carriers of the GG genotype of the rs11643630 polymorphism had significantly smaller aortic diameters than those with GT genotype or TT genotype ( P  = 0.02). Further haplotype analysis identified 1 protective haplotype (GC;  P  = 0.008) for development of type A AD. Again, a significant correlation was observed between haplotype GC and AD size ( P  = 0.020). Our results suggest that  MMP-2  gene polymorphisms contribute to type A AD susceptibility. In addition,  MMP-2  gene SNPs are associated with AD size, which could be used as a target for the development of new drug therapy.

MMP-2 gene polymorphisms are associated with type A aortic dissection and aortic diameters in patients