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In view of the importance of immune surveillance in cancer control, the dose-response relationship of the changes in different cell types of the immune system after whole-body irradiation is analyzed on the basis of systemic data from the author's laboratory in combination with recent reports in the literature. For T lymphocytes J- or inverted J-shaped curves are usually demonstrated after irradiation, while for macrophages dose-response curves of chiefly stimulation with irregular patterns are often observed. The intercellular reactions between the antigen presenting cell (APC) and T lymphocyte (TLC) in the immunologic synapse via expression of surface molecules and secretion of cytokines by the two cell types after different doses of radiation are illustrated. The different pathways of signal transduction thus facilitated in the T lymphocyte by different doses of radiation are analyzed to explain the mechanism of the phenomenon of low-dose stimulation and high-dose suppression of immunity. Experimental and clinical data are cited to show that LDR retards tumor growth, reduces metastasis, increases the efficacy of conventional radiotherapy and chemotherapy as well as alleviates the suppression of immunity due to tumor burden. The incidence of thymic lymphoma after high-dose radiation is lowered by preexposure to low-dose radiation, and its mechanism is supposed to be related to the stimulation of anticancer immunity induced by low-dose radiation. Recent reports on lowering of standardized cancer mortality rate and all cause death rate of cohorts occupationally exposed to low-dose radiation from the US, UK, and Canada are cited.<\/jats:p>","DOI":"10.1080\/15401420390844483","type":"journal-article","created":{"date-parts":[[2004,9,28]],"date-time":"2004-09-28T17:12:12Z","timestamp":1096391532000},"source":"Crossref","is-referenced-by-count":72,"title":["Nonlinear Dose-Response Relationship in the Immune System following Exposure to Ionizing Radiation: Mechanisms and Implications"],"prefix":"10.1177","volume":"1","author":[{"given":"Shu-Zheng","family":"Liu","sequence":"first","affiliation":[{"name":"Radiobiology Research Unit, Ministry of Health, PRC, Jilin University Norman Bethune Medical Center 8 Xinmin Street, Changchun 130021, China Phone number: +86-431-564-4597. 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