T-786C polymorphism in promoter of eNOS gene as genetic risk factor in patients with erectile dysfunction in Turkish population.

Objectives: To investigate the effect of 2 endothelial nitric oxide synthase gene polymorphisms, namely, variable number of 27-bp tandem repeats in intron 4 and T-786C in the promoter region, on the susceptibility to erectile dysfunction (ED) in Turkish population.

Methods: A total of 72 patients with ED (mean age 54.3 +/- 9.