Thromboangiitis obliterans (TAO) is an unusual tobacco-associated vasculopathy that is a non- atherosclerotic inflammatory disorder of unkn- own etiology that affects small and medium- sized vessels of the extremities. The single guanosine nucleotide deletion/insertion polym- orphism (4G/5G) at -675 bp in promoter region of the PAI-1 gene is the major genetic determi- nant of PAI-1 expression. Plasma PAI-1 level is higher in people with the homozygous 4G genotype than in those with the 5G/5G genotype and renders higher transcription activity. The aim of this study was to determine the status and the role of PAI-1 gene 4G/5G promoter polymorphism in patients with Buerger's disease (Thromboangiitis obliterans—TAO). The current case-control study included 30 consecutive pat- ients with Buerger's disease (mean age 42.9 ± 14.3 years, 28 men and 2 women), and 30 healthy volunteers (mean age 40.9 ± 4.79 years, 27 men and 3 women) between January 2006 and September 2009. Patients and control cases were genotyped for the 4G/5G polymorphism using the multiplex PCR based stripassay reverse hybridisation technique. It was found that heterozygote PAI-1 gene polymorphisms (p < 0.05) was significantly more frequent in patients with TAO in the current results. There was a significant difference in genotype distribution between the two groups (P < 0.001). The 4G allele occurred more frequently in the patient group of heavy smokers (P = 0.05). The current study shows the higher prevalence of of 4G allele in TAO patients in Sivas population means gene may predispose to TAO.
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