Complete response of advanced esophageal squamous cell carcinoma with first-line chemotherapy combined with immunotherapy: a Case report - Wei, Yahong; Han, Shaohui; Shi, Yabin; Li, Yaxing; Zhang, Qi; Zhang, Lijuan; Cheng, Yan; Yan, Xiaolu; Jia, Yitao (Frontiers in Immunology, 2025)