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Omega-3 Fatty Acid Supplements Do Not Prevent Cancer Or CVD

Discussion in 'Articles & Scientific Studies' started by Mito, Nov 11, 2018.

  1. Mito

    Mito Member

    Joined:
    Dec 10, 2016
    Messages:
    1,329
    November 10, 2018
    DOI: 10.1056/NEJMoa1811403

    Abstract
    BACKGROUND

    Higher intake of marine n−3 (also called omega-3) fatty acids has been associated with reduced risks of cardiovascular disease and cancer in several observational studies. Whether supplementation with n−3 fatty acids has such effects in general populations at usual risk for these end points is unclear.

    METHODS
    We conducted a randomized, placebo-controlled trial, with a two-by-two factorial design, of vitamin D3 (at a dose of 2000 IU per day) and marine n−3 fatty acids (at a dose of 1 g per day) in the primary prevention of cardiovascular disease and cancer among men 50 years of age or older and women 55 years of age or older in the United States. Primary end points were major cardiovascular events (a composite of myocardial infarction, stroke, or death from cardiovascular causes) and invasive cancer of any type. Secondary end points included individual components of the composite cardiovascular end point, the composite end point plus coronary revascularization (expanded composite of cardiovascular events), site-specific cancers, and death from cancer. Safety was also assessed. This article reports the results of the comparison of n−3 fatty acids with placebo.

    RESULTS
    A total of 25,871 participants, including 5106 black participants, underwent randomization. During a median follow-up of 5.3 years, a major cardiovascular event occurred in 386 participants in the n−3 group and in 419 in the placebo group (hazard ratio, 0.92; 95% confidence interval [CI], 0.80 to 1.06; P=0.24). Invasive cancer was diagnosed in 820 participants in the n−3 group and in 797 in the placebo group (hazard ratio, 1.03; 95% CI, 0.93 to 1.13; P=0.56). In the analyses of key secondary end points, the hazard ratios were as follows: for the expanded composite end point of cardiovascular events, 0.93 (95% CI, 0.82 to 1.04); for total myocardial infarction, 0.72 (95% CI, 0.59 to 0.90); for total stroke, 1.04 (95% CI, 0.83 to 1.31); for death from cardiovascular causes, 0.96 (95% CI, 0.76 to 1.21); and for death from cancer (341 deaths from cancer), 0.97 (95% CI, 0.79 to 1.20). In the analysis of death from any cause (978 deaths overall), the hazard ratio was 1.02 (95% CI, 0.90 to 1.15). No excess risks of bleeding or other serious adverse events were observed.

    CONCLUSIONS
    Supplementation with n−3 fatty acids did not result in a lower incidence of major cardiovascular events or cancer than placebo.

    (Funded by the National Institutes of Health and others; VITAL ClinicalTrials.gov number, NCT01169259.)

    NEJM - Error
     
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