G(-50) --> T promoter polymorphism of gene encoding human epoxygenase 2J2 in 107 patients with acute coronary syndrome and in 104 practically healthy people was determined. It was shown that interrelation of genotypes G/G, G/T and T/T was 91%, 9% Ta 0% correspondingly (in control--92%, 7%, 1%; P > 0.05 by chi2-test). The data indicate that epoxygenase 2J2 gene polymorphism is not a risk factor of acute coronary syndrome in Ukrainian population.