CYP2C19 and transient ischemic attack: In our study, we have evaluated the effect of polymorphisms of CYP2C19 (allele *2 (rs424485), allele *3 (rs4986893), allele *4 (rs28399504), and allele *17 (rs12248560)) on the occurrence of stroke, occurrence of the composite endpoint (TIA/ischemic stroke/vascular death), death vs. live, and recurrence of stroke/TIA.