Consumption of Fish and ω-3 Fatty Acids and Cancer Risk: An Umbrella Review of Meta-Analyses of Observational Studies

Nicola Veronese, Joaquim Radua, Andreas Kronbichler, Giuseppe Grosso, Hans J. Van Der Vliet, Trevor Thompson, Nicola Veronese, Lee Smith, Elena Dragioti, Nana Keum, Hans Oh, Eun Kyoung Choi, Michael Eisenhut, Mingyang Song, Gaeun Kim, Leandro Fórnias Machado De Rezende, Lin Yang, Keum Hwa Lee, Sarah E. Jackson, Giuseppe GrossoAi Koyanagi, Hyunbong Park, Edward L. Giovannucci, Brendon Stubbs, Jong Yeob Kim, Eunyoung Jung, Jae Il Shin, Sung Hwi Hong, Gwang Hun Jeong, Shuji Ogino, Louis Jacob, Hyo Jin Seong, Sun Jae Jung, Gabriele Gamerith, Marco Solmi, Eunyoung Cho

Risultato della ricerca: Articlepeer review

1 Citazioni (Scopus)


Multiple studies have suggested that ω-3 fatty acid intake may have a protective effect on cancer risk; however, its true association with cancer risk remains controversial. We performed an umbrella review of meta-analyses to summarize and evaluate the evidence for the association between ω-3 fatty acid intake and cancer outcomes. We searched PubMed, Embase, and the Cochrane Database of Systematic Reviews from inception to December 1, 2018. We included meta-analyses of observational studies that examined associations between intake of fish or ω-3 fatty acid and cancer risk (gastrointestinal, liver, breast, gynecologic, prostate, brain, lung, and skin) and determined the level of evidence of associations. In addition, we appraised the quality of the evidence of significant meta-analyses by using the Grading of Recommendations Assessment, Development and Evaluation (GRADE) system. We initially screened 598 articles, and 15 articles, including 57 meta-analyses, were eligible. Among 57 meta-analyses, 15 reported statistically significant results. We found that 12 meta-analyses showed weak evidence of an association between ω-3 fatty acid intake and risk of the following types of cancer: liver cancer (n = 4 of 6), breast cancer (n = 3 of 14), prostate cancer (n = 3 of 11), and brain tumor (n = 2 of 2). In the other 3 meta-analyses, studies of endometrial cancer and skin cancer, there were no assessable data for determining the evidence levels. No meta-analysis showed convincing, highly suggestive, or suggestive evidence of an association. In the sensitivity analysis of meta-analyses by study design, we found weak associations between ω-3 fatty acid intake and breast cancer risk in cohort studies, but no statistically significant association in case-control studies. However, the opposite results were found in case of brain tumor risk. Although ω-3 fatty acids have been studied in several meta-analyses with regard to a wide range of cancer outcomes, only weak associations were identified in some cancer types, with several limitations. Considering the nonsignificant or weak evidence level, clinicians and researchers should cautiously interpret reported associations between ω-3 fatty acid consumption and cancer risks. Copyright © 2020 The Author(s) on behalf of the American Society for Nutrition.
Lingua originaleEnglish
pagine (da-a)1134-1149
Numero di pagine16
RivistaAdvances in Nutrition
Stato di pubblicazionePublished - 2020

All Science Journal Classification (ASJC) codes

  • Food Science
  • Medicine (miscellaneous)
  • Nutrition and Dietetics

Cita questo