Sun Yat-sen University Cancer Center;
State Key Laboratory of Oncology in South China;
Collaborative Innovation Center for Cancer Medicine;
Department of Radiation Oncology;
Sun Yat-sen University Cancer Center;
Collaborative Innovation Center for Cancer Medicine;
Medical Imaging and Interventional Center;
Sun Yat-sen University Cancer Center;
Esophageal squamous cell carcinoma; Insulin-like growth factor-binding protein-3; Immunohistochemistry; Radiotherapy response; Prognosis;