A nomogram for predicting cancer-specific survival in patients with locally advanced unresectable esophageal cancer: development and validation study - Xie, Liangyun; Zhang, Yafei; Niu, Xiedong; Jiang, Xiaomei; Kang, Yuan; Diao, Xinyue; Fang, Jinhai; Yu, Yilin; Yao, Jun (Frontiers in Immunology, 2025)