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The aim of this study was to observe dynamic changes in immunological parameters and levels of inflammatory factors from pre-radiotherapy to post-radiotherapy in patients with esophageal cancer, and to evaluate the related clinical prognosis. In all, 110 patients with esophageal cancer who underwent radiotherapy were enrolled. Before radiotherapy, post-radiotherapy, and 3 months after radiotherapy, the percentages of T lymphocyte subsets and natural killer (NK) cells in peripheral blood were detected using flow cytometry. The levels of serum inflammatory factors were measured with the enzyme-linked immunosorbent assay (ELISA). Thirty peripheral blood samples from healthy people were similarly analysed as the control. Before radiotherapy, the percentages of CD4+ and CD8+ T cells and NK cells, and the CD4+/CD8+ rate in esophageal cancer patients were significantly different from those in the healthy control group (P &lt; 0.001); the levels of inflammatory factors were increased significantly (P &lt; 0.001). The percentages of the above cells and the levels of inflammatory factors also differed statistically significantly between pre- and post-radiotherapy (P &lt; 0.001) in the esophageal cancer patients. Three months after radiotherapy, the percentages of CD3+ (P = 0.453), CD4+ (P = 0.108), and CD8+ T cells (P = 0.163) and NK cells (P = 0.103) had recovered to the level before radiotherapy; and the levels of TNF-α (P = 0.101), IL-6 (P = 0.302) and IL-8 (P = 0.250) were also restored. After radiotherapy, alterations in immunological parameters were associated with the irradiation volume and the myelosuppression condition. Patients with recovered immunological parameters showed a longer median survival time than those with poor recovery of immunological parameters. For esophageal cancer patients who were immunosuppressive and had an activated inflammatory response before radiotherapy, radiotherapy aggravated these symptoms, and this aggravation was positively associated with myelosuppression and irradiation volume. In addition, recovery of the immunological parameters indicated better prognosis.

Impact of radiotherapy on immunological parameters, levels of inflammatory factors, and clinical prognosis in patients with esophageal cancer