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Ionizing radiation and risk of chronic lymphocytic leukemia in the 15-country study of nuclear industry workers.

Authors
Vrijheid-M; Cardis-E; Ashmore-P; Auvinen-A; Gilbert-E; Habib-RR; Malker-H; Muirhead-CR; Richardson-DB; Rogel-A; Schubauer-Berigan-M; Tardy-H; Telle-Lamberton-M
Source
Radiat Res 2008 Nov; 170(5):661-665
NIOSHTIC No.
20034713
Abstract
In contrast to other types of leukemia, chronic lymphocytic leukemia (CLL) has long been regarded as non-radiogenic, i.e. not caused by ionizing radiation. However, the justification for this view has been challenged. We therefore report on the relationship between CLL mortality and external ionizing radiation dose within the 15-country nuclear workers cohort study. The analyses included, in seven countries with CLL deaths, a total of 295,963 workers with more than 4.5 million person-years of follow-up and an average cumulative bone marrow dose of 15 mSv; there were 65 CLL deaths in this cohort. The relative risk (RR) at an occupational dose of 100 mSv compared to 0 mSv was 0.84 (95% CI 0.39, 1.48) under the assumption of a 10-year exposure lag. Analyses of longer lag periods showed little variation in the RR, but they included very small numbers of cases with relatively high doses. In conclusion, the largest nuclear workers cohort study to date finds little evidence for an association between low doses of external ionizing radiation and CLL mortality. This study had little power due to low doses, short follow-up periods, and uncertainties in CLL ascertainment from death certificates; an extended follow-up of the cohorts is merited and would ideally include incident cancer cases.
Keywords
Biological-factors; Biological-systems; Occupational-exposure; Radiation-effects; Radiation-exposure; Radiation-hazards; Radiation-injury; Radiation-properties; Radiation-sources; Nuclear-hazards; Nuclear-radiation; Nuclear-power-plants; Cancer; Bloodborne-pathogens; Leukemogenesis; Mortality-rates
CODEN
RAREAE
Publication Date
20081101
Document Type
Journal Article
Fiscal Year
2009
NTIS Accession No.
NTIS Price
Issue of Publication
5
ISSN
0033-7587
NIOSH Division
DSHEFS
Priority Area
Manufacturing
Source Name
Radiation Research
State
OH; MD; NC
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