Journal
CARCINOGENESIS
Volume 35, Issue 9, Pages 2047-2054Publisher
OXFORD UNIV PRESS
DOI: 10.1093/carcin/bgu098
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Funding
- Health Research Fund (FIS) of the Spanish Ministry of Health [PI05/1392]
- European Commission (DGSANCO)
- Spanish Regional Government of Andalucia
- Spanish Regional Government of Asturias
- Spanish Regional Government of Basque Country
- Spanish Regional Government of Murcia
- Spanish Regional Government of Navarra
- Catalan Institute of Oncology
- Red Tematica de Investigacion Cooperativa en Cancer of the Spanish Ministry of Health [ISCIII RTICC R06/0020/0091]
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In this case-cohort study, we examined the association between bulky DNA adducts and the risk of lung cancer within the European Prospective Investigation into Cancer and Nutrition (EPIC) Spanish cohort with an average 7-year follow-up, including 98 cases of primary lung cancer and 296 subjects randomly selected from the cohort. Aromatic adducts were measured using P-32-postlabeling in leukocyte DNA from blood samples collected at enrollment. The association between DNA adducts and the risk of lung cancer was estimated using a Cox proportional hazards model with a modified partial likelihood. There was an overall significant increased risk for developing lung cancer when DNA adduct concentrations were doubled, with relative risk (RR) adjusting for all relevant confounders of 1.36 with 95% confidence interval (CI) 1.18-157. There was a significant increased risk for developing lung cancer when DNA adduct concentrations were doubled for current smokers and among subjects exposed to PAH at work; there was also a slightly higher increase among males than females. However, no statistically significant differences were observed for the effect of adduct levels across smoking status, sex or occupational exposure to PAH. A meta-analysis combined four prospective studies, including this study, resulting in a significant association among current smokers, with an overall estimate of 34% increase in the risk of lung cancer when doubling the level of aromatic DNA adducts in leukocytes.
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