Diet-Driven Inflammation and Insulinemia and Risk of Interval Breast Cancer

Area of Science:

• Oncology
• Epidemiology
• Nutrition Science

Background:

• Interval breast cancers (IBCs) are diagnosed between routine screening mammograms.
• Identifiable risk factors for IBC remain largely unknown.
• Dietary patterns may influence cancer risk, but their role in IBC is unclear.

Purpose of the Study:

• To investigate the association between the Empirical Dietary Inflammatory Pattern (EDIP) and Empirical Dietary Index for Hyperinsulinemia (EDIH) scores and the risk of IBC.
• To compare dietary patterns in women with IBC versus those with screen-detected breast cancer.

Main Methods:

• Analysis of data from postmenopausal women (50-79 years) in the Women's Health Initiative cohort.
• Food frequency questionnaires used to calculate EDIP and EDIH scores.
• Comparison of IBC cases (N=317) with screen-detected breast cancer cases (N=1,928) using multivariable logistic regression.

Main Results:

• No significant association was found between EDIP or EDIH scores and the risk of IBC.
• Odds ratios for IBC comparing the highest to lowest tertiles were 1.08 for EDIP (95% CI, 0.78-1.48) and 0.92 for EDIH (95% CI, 0.67-1.27).
• These null associations remained consistent across different BMI categories.

Conclusions:

• Diet-driven inflammation and hyperinsulinemia do not appear to be major risk factors for interval breast cancer in postmenopausal women.
• Further research is necessary to identify specific, modifiable risk factors for IBC prevention.