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Updated: Jan 11, 2026
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Disorders of Erythrocytes
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ガンリスクに対するオメガ3脂肪酸の効果:体系的なレビュー
Catherine H MacLean1, Sydne J Newberry, Walter A Mojica
1Southern California Evidence-Based Practice Center, RAND Health, Santa Monica 90407-2138, USA. maclean@rand.org
JAMA
|January 26, 2006
まとめ
オメガ3脂肪酸は,がんリスクを有意に減らすようには見えません. 多くの研究の包括的なレビューでは,オメガ3の摂取とがん予防を結びつける一貫した証拠は見つかりませんでした.
科学分野:
- 栄養学的流行病学について
- がん研究 がん研究
- 予防医学は,予防的な医療です.
背景:
- オメガ3脂肪酸は,がん予防効果があると広く考えられている.
- しかし,この関連性に関する既存の科学的証拠は,依然として不確実であり,しばしば矛盾しています.
研究 の 目的:
- オメガ3脂肪酸の摂取量とがん発生率の関係に関する前向きなコホート研究からの証拠を体系的にレビューし,合成する.
- ガンリスクに対するオメガ3脂肪酸の効果の統合された見積もりを提供するため.
主な方法:
- 複数のデータベース (MEDLINE,EMBASEなど) で包括的な文献検索が行われました. また,未公開のデータも含まれていた.
- 既定の基準に基づいて,ヒト集団を対象とした38件の前向きなコホート研究が選択されました.
- 癌の発生率,オメガ3の暴露,研究の質に関するデータは,2人のレビュー者によって独立して抽出されました.
主要な成果:
- 7カ国の20コホートを分析した結果,65の関連性推定が明らかになり,統計的に有意なものはわずか8つであった.
- 研究における異質性は,データの統合を妨げました.
- いくつかの研究では,特定の癌 (例えば,乳がん,肺,前立腺,皮膚) に対して有意な関連性が見られたが,これらは一貫しておらず,多くは有意な関連性を示さなかった.
結論:
- 多くの国際的なコホートからの入手可能な証拠は,オメガ3脂肪酸の消費とがん発生の間の有意な関連性を支持していません.
- オメガ3脂肪酸の栄養補充は,がん予防の効果的な戦略である可能性は低い.
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