Objectives To examine levels of peripheral blood T cell subsets in patients with esophageal cancer prior to treatment and to ascertain the immune status of patients in order to improve their prognosis and quality of life. Method Samples were collected from 123 patients with esophageal carcinoma who were seen at the Fourth Hospital of Hebei Medical University.Seventy-seven of the 123 patients had lymph node metastasis while 46 patients had no metastasis.Three ml of peripheral blood was collected from each pa...