Background/Objectives:B vitamins and related enzymes involved in one-carbon metabolism are necessary for DNA replication, DNA repair and regulation of gene expression. Disruption of one-carbon mechanism may affect cancer risk. We investigated prospectively the relationship between dietary intakes of methionine, B vitamins associated with one-carbon metabolism and risk of lung cancer.Subjects/Methods:The Melbourne Collaborative Cohort Study recruited 41 514 men and women aged 40-69 years between 1990 and 1994. During follow-up of 14 595 men and 22 451 women for an average of 15 years, we ascertained 348 incident lung cancers. Dietary intake of B vitamins and methionine was estimated from a 121-item food frequency questionnaire. Hazard ratios (HR) and 95% confidence intervals (CI) were estimated using Cox regression.Results:In current smokers, dietary intake of riboflavin was inversely associated with lung cancer risk (HR=0.53; 95% CI: 0.29-0.94, fifth versus first quintile; P-linear trend=0.01). No associations were found for former or never smokers or for dietary intake of any of the other B vitamins or methionine.Conclusion:Overall, we found little evidence of an association between B vitamins or methionine and lung cancer risk. The weak inverse association between riboflavin and lung cancer risk in current smokers needs further investigation. © 2012 Macmillan Publishers Limited. All rights reserved.

Dietary intake of B vitamins and methionine and risk of lung cancer

BAGLIETTO, LAURA;
2012-01-01

Abstract

Background/Objectives:B vitamins and related enzymes involved in one-carbon metabolism are necessary for DNA replication, DNA repair and regulation of gene expression. Disruption of one-carbon mechanism may affect cancer risk. We investigated prospectively the relationship between dietary intakes of methionine, B vitamins associated with one-carbon metabolism and risk of lung cancer.Subjects/Methods:The Melbourne Collaborative Cohort Study recruited 41 514 men and women aged 40-69 years between 1990 and 1994. During follow-up of 14 595 men and 22 451 women for an average of 15 years, we ascertained 348 incident lung cancers. Dietary intake of B vitamins and methionine was estimated from a 121-item food frequency questionnaire. Hazard ratios (HR) and 95% confidence intervals (CI) were estimated using Cox regression.Results:In current smokers, dietary intake of riboflavin was inversely associated with lung cancer risk (HR=0.53; 95% CI: 0.29-0.94, fifth versus first quintile; P-linear trend=0.01). No associations were found for former or never smokers or for dietary intake of any of the other B vitamins or methionine.Conclusion:Overall, we found little evidence of an association between B vitamins or methionine and lung cancer risk. The weak inverse association between riboflavin and lung cancer risk in current smokers needs further investigation. © 2012 Macmillan Publishers Limited. All rights reserved.
2012
Bassett, J. K; Hodge, A. M.; English, D. R.; Baglietto, Laura; Hopper, J. L.; Giles, G. G.; Severi, G.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/817771
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