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Background Hypertension (HTN) is a major determinant of various cardiovascular events.Plasma levels of plasminogen activator inhibitor 1 (PAl-1) modulate this risk.A deletion/insertion polymorphism within the PAl-1 loci (4G/4G,4G/5G,5G/5G) affects the expression of this gene.The present study investigated the association between PAl-1 loci polymorphisms and HTN in Korean women.@@Methods Korean women (n=1312) were enrolled in this study to evaluate the association between PAl-1 4G/5G gene polymorphisms and HTN as well as other metabolic risk factors.PAl-1 loci polymorphisms were investigated using polymerase chain reaction amplification and single-strand conformation polymorphism analysis.@@Results The three genotype groups differed with respect to systolic blood pressure (P=0.043),and diastolic blood pressure (P=0.009) but not with respect to age,body mass index,total cholesterol,low or high density lipoprotein cholesterol,triglycerides,or fasting blood glucose.Carriers of the PAl-1 4G allele had more hypertension significantly (PAl-1 4G/5G vs.PAl-1 5G/5G,P=0.032; PAl-1 4G/4G vs.PAl-1 5G/5G,P=0.034).When stratified according to PAl-1 4G/5G polymorphism,there was no significant difference in all metabolic parameters among PAl-1 genotype groups in patients with HTN as well as subjects with normal blood pressure.The estimated odds ratio of the 4G/4G genotype and 4G/5G for HTN was 1.7 (P=0.005),and 1.6 (P=0.015),respectively.@@Conclusion These findings might indicate that PAl-1 loci polymorphisms independently contribute to HTN and that gene-environmental interaction may be not associated in Korean women.