The frequency of the major and minor alleles of CYP2C19*2 and CYP2C19*3 did not deviate significantly from the Hardy-Weinberg equilibrium neither in the stroke (χ2 = 1.380, P = 0.502; χ2 = 4.180, P = 0.124), nor in the control group (χ2 = 1.749, P = 0.417; χ2 = 0.400, P = 0.819). The gene discussed is CYP2C19; the disease is stroke disorder.