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Association between dietary inflammatory potential and breast cancer incidence and death: results from the Women’s Health Initiative
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Association between dietary inflammatory potential and breast cancer incidence and death: results from the Women’s Health Initiative
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Journal Article
Association between dietary inflammatory potential and breast cancer incidence and death: results from the Women’s Health Initiative
2016
Overview
Background:
Diet modulates inflammation and inflammatory markers have been associated with cancer outcomes. In the Women’s Health Initiative, we investigated associations between a dietary inflammatory index (DII) and invasive breast cancer incidence and death.
Methods:
The DII was calculated from a baseline food frequency questionnaire in 122 788 postmenopausal women, enrolled from 1993 to 1998 with no prior cancer, and followed until 29 August 2014. With median follow-up of 16.02 years, there were 7495 breast cancer cases and 667 breast cancer deaths. We used Cox regression to estimate multivariable-adjusted hazards ratios (HRs) and 95% confidence intervals (95% CIs) by DII quintiles (Q) for incidence of overall breast cancer, breast cancer subtypes, and deaths from breast cancer. The lowest quintile (representing the most anti-inflammatory diet) was the reference.
Results:
The DII was not associated with incidence of overall breast cancer (HR
Q5
vs
Q1
, 0.99; 95% CI, 0.91–1.07;
P
trend
=0.83 for overall breast cancer). In a full cohort analysis, a higher risk of death from breast cancer was associated with consumption of more pro-inflammatory diets at baseline, after controlling for multiple potential confounders (HR
Q5
vs
Q1
, 1.33; 95% CI, 1.01–1.76;
P
trend
=0.03).
Conclusions:
Future studies are needed to examine the inflammatory potential of post-diagnosis diet given the suggestion from the current study that dietary inflammatory potential before diagnosis is related to breast cancer death.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
/ 692/499
/ Aged
/ Biomedical and Life Sciences
/ Breast Neoplasms - epidemiology
/ Breast Neoplasms - mortality
/ Breast Neoplasms - pathology
/ Breast Neoplasms - prevention & control
/ C-Reactive Protein - analysis
/ Diet
/ Female
/ Food
/ Humans
/ Inflammation - complications
/ Oncology
/ Tumor Necrosis Factor-alpha - analysis
