At 24 h, HIF-1α serum level, in control subjects, was 2205 ± 118 pg/mL and it significantly decreased, in comparison to T0, in both AIS and TIA patients (3765 ± 231 and 3445 ± 197 pg/mL, respectively, both p < 0.01 vs. T0). The gene discussed is HIF1A; the disease is transient ischemic attack.