SERPINE1 and ischemic stroke: As the SERPINE1 antibody levels were elevated in patients with ischemic stroke and were correlated with carotid IMT, we performed carotid endarterectomy in nine patients with carotid stenosis and immunohistochemical staining of the intima of the resulting carotid sclerotic plaques using anti-SERPINE1 antibody and a vascular endothelial cell marker, anti-CD 31 antibody.