GPX1 and coronary artery disorder: GPX-1 activity did not show significant differences between two genotypes in both vessel and extent score groups, however the Pro198Leu (CT) genotype showed a trend of reduction in GPX-1 activity with increase severity in all three score groups indicating that T allele (Proline to Leucine substitution) was less responsive in stimulation of erythrocyte GPX-1 activity in patients with CAD.