IL1RL1 and atherosclerosis: The aims of this study were to (1) assess the association between sST2 serum levels concentrations and the immunohistochemical expression of ST2L in atherosclerotic plaques from internal carotid arteries of patients who underwent endarterectomy and (2) evaluate the prognostic impact of sST2 and ST2L expression on the overall survival rate of patients with ASCVD.