Metabolic syndrome and total cancer mortality in the Third National Health and Nutrition Examination Survey
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Although metabolic syndrome incidence has substantially increased during the last few decades, it largely remains unclear whether this metabolic disorder is associated with total cancer mortality. The present study was carried out to investigate this important question.
A total of 687 cancer deaths were identified from 14,916 participants in the third National Health and Nutrition Examination Survey by linking them to the National Death Index database through December 31, 2006. Cox proportional hazards regression was performed to calculate hazard ratios (HR) and 95% confidence intervals (CI) for total cancer mortality in relation to metabolic syndrome and its individual components.
After adjustment for confounders, a diagnosis of metabolic syndrome was associated with 33% elevated total cancer mortality. Compared with individuals without metabolic syndrome, those with 3, 4 and 5 abnormal components had HRs (95% CIs) of 1.28 (1.03–1.59), 1.24 (0.96–1.60), and 1.87 (1.34–2.63), respectively (p-trend = 0.0003). Systolic blood pressure and serum glucose were associated with an increased risk of death from total cancer [HR (95% CI) for highest vs. lowest quartiles: 1.67 (1.19–2.33), p-trend = 0.002 and 1.34 (1.04–1.74), p-trend = 0.003, respectively]. Overall null results were obtained for lung cancer mortality. The effects of metabolic syndrome and its components on non-lung cancer mortality were generally similar to, but somewhat larger than, those for total cancer mortality.
Our study is among the first to reveal that metabolic syndrome is associated with increased total cancer mortality.
KeywordsMetabolic syndrome Obesity Total cancer mortality Lung cancer mortality Non-lung cancer mortality, cohort study Epidemiology
Dr. Gathirua-Mwangi is a postdoc appointee funded by a supplemental grant under R01CA196243 (PIs: Drs. Champion and Paskett). Research reported in this publication was supported by the National Cancer Institute of the National Institutes of Health under Award Numbers 3R01CA196243-02S1, R25 CA117865-07S1 and K05CA175048.The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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