Cited by 984Fatty Acid Research and HealthNutritional Studies and DietAquaculture Nutrition and Growth

Marine n−3 Fatty Acids and Prevention of Cardiovascular Disease and Cancer

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Manson, JoAnn E., Cook, Nancy R., Lee, I-Min, Christen, William, Bassuk, Shari S., Mora, Samia, Gibson, Heike, Albert, Christine M. +9 more·2019·New England Journal of Medicine

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: (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 .).

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Crossref · 10.1056/nejmoa1811403

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  • Among outcomes trials with omega-3 preparations, only REDUCE-IT has shown cardiovascular benefits.

    “although only REDUCE-IT has shown cardiovascular benefits (as discussed later) (14-17).”

    From 2021 ACC Expert Consensus Decision Pathway on the Management of ASCVD Risk Reduction in Patients With Persistent Hypertriglyceridemia (2021) · cites this paper as [16]

    The discussion (p. 30) says two earlier large trials showed significant protection against coronary events and that one subsequent placebo-controlled trial did as well. The Cardiovascular Disease results also report lower risks of myocardial infarction and coronary heart disease in this trial, although its primary cardiovascular endpoint was not significantly reduced. The source therefore contradicts the assertion that only REDUCE-IT showed cardiovascular benefits. (LLM, conf=0.90)

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  • Several large clinical trials failed to demonstrate any cardiovascular benefit with administration of low doses of omega-3 fatty acids.

    “butseverallargeclinicaltrialsfailed to demonstrate any cardiovascular benefit with administration of low doses of omega-3 fatty acids. 8,12,13”

    From Effect of High-Dose Omega-3 Fatty Acids vs Corn Oil on Major Adverse Cardiovascular Events in Patients at High Cardiovascular Risk (2020) · cites this paper as [13]

    The Discussion reports that this 1-g/day trial did not significantly reduce major cardiovascular events and that other trials had generally null results. But it also reports a lower risk of myocardial infarction in this trial, while the passage labeled p. 30 notes coronary protection in two early large trials. Thus, “any cardiovascular benefit” overstates what the paper says. (LLM, conf=0.88)

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  • The STRENGTH, VITAL, ASCEND, ORIGIN, OMEGA, ALPHA-OMEGA, GISSI-HF and GISSI-P trials randomized patients to receive either a combination of EPA and DHA or placebo; yet only the GISSI trials noted a statistically significant effect on cardiovascular events and mortality.

    “The STRENGTH, VITAL, ASCEND, ORIGIN, OMEGA, ALPHA-OMEGA, GISSI-HF and GISSI-P trials randomized patients to receive either a combination of EPA and DHA or placebo; yet only the GISSI trials noted a statistically significant effect on cardiovascular events and mortality [96–103].”

    From Established and Emerging Lipid-Lowering Drugs for Primary and Secondary Cardiovascular Prevention (2023) · cites this paper as [96]

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  • In the VITAL trial, supplementation with 1 g of omega-3 fatty acids did not result in a lower incidence of major cardiovascular events in participants, 13% of whom had type 2 diabetes.

    “TheVitaminDandOmega-3Trial(VITAL), in which 13% of the participants had type 2 diabetes, supplementation with 1 g of omega-3 fatty acids did not result in a lower incidence of major cardiovascular events (305).”

    From Nutrition Therapy for Adults With Diabetes or Prediabetes: A Consensus Report (2019) · cites this paper as [305]

    The Discussion reports that 1 g per day of n−3 fatty acids did not significantly lower the incidence of major cardiovascular events. The baseline-characteristics table, reproduced in the Cancer and All-Cause Mortality section, reports diabetes in 13.7% of participants, but does not identify it specifically as type 2 diabetes; it also gives a figure closer to 14% than 13%. (LLM, conf=0.85)

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  • Clinical trials revealed that omega-3 PUFA supplementation of <1 g/d resulted in a very limited reduction in atherosclerotic CVD risk of major vascular events and CVD-caused deaths.

    “Clinical trials revealed that ω3 PUFA supplementation of <1 g/d resulted in a very limited reduction in atherosclerotic CVD risk of major vascular events and CVD‐caused deaths. 22 , 23 , 133 , 154”

    From Association Between Omega-3 Fatty Acid Intake and Dyslipidemia: A Continuous Dose-Response Meta-Analysis of Randomized Controlled Trials (2023) · cites this paper as [23]

    The Discussion reports that meta-analyses found no, or at most a weak, preventive effect on cardiovascular outcomes, which supports the characterization of a very limited benefit. But this trial tested 1 g/day, not less than 1 g/day, and its Cardiovascular Disease results found no statistically significant reduction in major cardiovascular events or cardiovascular deaths. (LLM, conf=0.88)

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Authors
Manson, J. E., Cook, N. R., Lee, I.-M., Christen, W., Bassuk, S. S., Mora, S., Gibson, H., Albert, C. M., Gordon, D., Copeland, T., D’Agostino, D., Friedenberg, G., Ridge, C., Bubes, V., Giovannucci, E. L., Willett, W. C., & Buring, J. E.
Affiliations
  • Brigham and Women's Hospital (US)
  • From the Department of Medicine, Brigham and Women’s Hospital and Harvard Medical School (J.E.M., N.R.C., I-M.L., W.C., S.S.B., S.M., H.G., C.M.A., D.G., T.C., D.D., G.F., C.R., V.B., E.L.G., W.C.W., J.E.B.), and the Departments of Epidemiology (J.E.M., N.R.C., I.-M.L., W.C.W., J.E.B.) and Nutrition (E.L.G., W.C.W.), Harvard T.H. Chan School of Public Health — all in Boston.
Venue
New England Journal of Medicine
Published
2019-01-03
Volume
380
Issue
1
Pages
23-32
ISSN
  • 0028-4793 (ISSN-L)
  • 1533-4406
OpenAlex
W2899720772
Cited by
979
References
94
Citations by year
2026: 78 · 2025: 93 · 2024: 98 · 2023: 121 · 2022: 130 · 2021: 136 · 2020: 162 · 2019: 141 · 2018: 17 · 2014: 1
FWCI
94.27
Type
journal article
Language
en
Open access
Locations
  • New England Journal of Medicine (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Heart, Lung, and Blood Institute (R0 CA138962)
  • National Cancer Institute
Topics
  • Health Sciences › Nursing › Nutrition and Dietetics › Fatty Acid Research and Health
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Nutritional Studies and Diet
  • Life Sciences › Agricultural and Biological Sciences › Aquatic Science › Aquaculture Nutrition and Growth
Keywords
omega-3 fatty acids, cardiovascular disease prevention, cancer prevention, primary prevention, cardiovascular events, myocardial infarction, stroke, cancer mortality, coronary revascularization, dietary supplementation, cardiovascular risk reduction, cancer risk reduction, older adults, Black participants, cancer risk factors
MeSH terms
Aged, Cardiovascular Diseases, Female, Follow-Up Studies, Humans, Male, Middle Aged, Neoplasms, Fatty Acids, Omega-3, Incidence, Treatment Failure

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