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Radiation exposure and cancer mortality among nuclear power plant workers: A meta-analysis

Authors
Park, E.S.Moon, K.Kim, H.N.Lee, W.J.Jin, Y.-W.
Issue Date
2010
Keywords
Cancer; Meta-analysis; Radiation worker; Standardized mortality ratio
Citation
Journal of Preventive Medicine and Public Health, v.43, no.2, pp.185 - 192
Indexed
SCOPUS
KCI
Journal Title
Journal of Preventive Medicine and Public Health
Volume
43
Number
2
Start Page
185
End Page
192
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/118355
DOI
10.3961/jpmph.2010.43.2.185
ISSN
1975-8375
Abstract
Objectives: We conducted a meta-analysis to investigate the relationship between low external doses of ionizing radiation exposure and the risk of cancer mortality among nuclear power plant workers. Methods: We searched MEDLINE using key words related to low dose and cancer risk. The selected articles were restricted to those written in English from 1990 to January 2009. We excluded those studies with no fit to the selection criteria and we included the cited references in published articles to minimize publication bias. Through this process, a total of 11 epidemiologic studies were finally included. A publication bias was tested for using Egger's test. The homogeneity test was performed before the integration of each of the standardized mortality ratios (SMRs) and the result proved that the studies were heterogeneous. Results: We found significant decreased deaths from all cancers (SMR = 0.75, 95% CI = 0.62 - 0.90), all cancers excluding leukemia, solid cancer, mouth and pharynx, esophagus, stomach, rectum, liver and gallbladder, pancreas, lung, prostate, lymphopoietic and hematopoitic cancer. The findings of this meta-analysis were similar with those of the 15 Country Collaborative Study conducted by the International Agency for Research on Cancer. A publication bias was found only for liver and gallbladder cancer (p = 0.015). Heterogeneity was observed for all cancers, all cancers excluding leukemia, solid cancer, esophagus, colon and lung cancer. Conclusions: Our findings of low mortality for stomach, rectum, liver and gallbladder cancers may explained by the health worker effect Yet further studies are needed to clarify the low SMR of cancers, for which there is no useful screening tool, in nuclear power plant workers.
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