RecruitingPhase 3Drug trialEfficacy and Safety of Interleukin-6 Receptor Inhibitor Combined With Endovascular Treatment in Patients With Acute Posterior Circulation Large Vessel Occlusion StrokeThis is an investigator-initiated phase III clinical trial employing a randomized, double-blind, placebo-controlled design. The primary objective of this study is to investigate the efficacy and safety of an interleukin-6 inhibitor (tocilizumab) combined with endovascular therapy in patients with acute posterior circulation large-vessel occlusion stroke.