| Autor: |
Tawn EJ; a Centre for Integrated Genomic Medical Research (CIGMR), Centre for Epidemiology, Institute of Population Health, The University of Manchester, Manchester, M13 9PT, United Kingdom.; b Formerly of Westlakes Research Institute2, Westlakes Science and Technology Park, Moor Row, Cumbria, CA24 3LN, United Kingdom., Curwen GB; a Centre for Integrated Genomic Medical Research (CIGMR), Centre for Epidemiology, Institute of Population Health, The University of Manchester, Manchester, M13 9PT, United Kingdom.; b Formerly of Westlakes Research Institute2, Westlakes Science and Technology Park, Moor Row, Cumbria, CA24 3LN, United Kingdom., Jonas P; c Formerly of Northern Genetics Service, Institute of Genetic Medicine, International Centre for Life, Newcastle University, Newcastle upon Tyne, NE1 3BZ, United Kingdom., Gillies M; b Formerly of Westlakes Research Institute2, Westlakes Science and Technology Park, Moor Row, Cumbria, CA24 3LN, United Kingdom.; d Public Health England, Centre for Radiation, Chemical and Environmental Hazards, Westlakes Science and Technology Park, Moor Row, Cumbria, CA24 3HU, United Kingdom., Hodgson L; b Formerly of Westlakes Research Institute2, Westlakes Science and Technology Park, Moor Row, Cumbria, CA24 3LN, United Kingdom., Cadwell KK; b Formerly of Westlakes Research Institute2, Westlakes Science and Technology Park, Moor Row, Cumbria, CA24 3LN, United Kingdom. |
| Abstrakt: |
Workers from the Sellafield nuclear facility (Cumbria, UK) with occupational exposures to external sources of ionizing radiation were examined for translocation frequencies in peripheral blood lymphocytes using fluorescence in situ hybridization (FISH). This is an extension of an earlier study of retired workers, and includes analyses of additional samples from the earlier collection, bringing the total to 321. Another 164 samples from both current and retired employees, including 26 repeat samples, were obtained from a new collection, thus giving a combined dataset of 459 workers. This all-male population of workers was divided into 6 dose groups comprising 97 with recorded external occupational doses <50 mGy, 118 with 50-249 mGy, 129 with 250-499 mGy, 89 with 500-749 mGy, 17 with 750-999 mGy and 9 with >1,000 mGy. Univariate analysis showed a significant association between external dose and translocation frequency (P < 0.001) with the estimate of slope ± standard error being 1.174 ± 0.164 × 10(-2) translocations per Gy. Multivariate analysis revealed that age increased the rate of translocations by 0.0229 ± 0.0052 × 10(-2) per year (P < 0.001). However, the impact of age adjustment on the radiation dose response for translocation frequencies was minor with the new estimate of slope ± standard error being 1.163 ± 0.162 × 10(-2) translocations per Gy. With the dose response for the induction of translocations by chronic in vivo low-LET radiation now well characterized, cytogenetic analysis can play an integral role in retrospective dose reconstruction of chronic exposure in epidemiological studies of exposed populations. |
