ALB and esophageal cancer: Within 2 weeks before radiotherapy, during radiotherapy, and within 1 month after radiotherapy, the peripheral blood data of all enrolled esophageal cancer patients were recorded, including the total number of peripheral blood lymphocytes, hemoglobin, and albumin values, etc. The time point before radiotherapy is represented by T1, the time point after radiotherapy is represented by T2, and the minimum value of ALC during radiotherapy is considered to be the lowest point of lymphocytes, which is represented by MinALC.