Overexpression of serum HMGB1 and IDO in esophageal squamous cell carcinoma patients: potential clinical auxiliary diagnostic markers and immunotherapeutic targets - Cui, Wenxuan; Niu, Yinghao; Zhang, Xueyuan; Huang, Beixuan; Shang, Xiaoya; Zhao, Wei; Yan, Xi; Mi, Yunqiang (Frontiers in Oncology, 2024)