Diabetes and Breast Cancer Subtypes

Area of Science:

• Oncology
• Endocrinology
• Pathology

Background:

• Women with diabetes exhibit poorer breast cancer survival rates compared to non-diabetic women.
• This disparity may stem from distinct etiological factors leading to more aggressive breast cancer subtypes.
• Investigating specific clinicopathological subtypes in diabetic vs. non-diabetic women is crucial.

Purpose of the Study:

• To determine if women with diabetes, treated with or without insulin, develop distinct clinicopathological breast cancer subtypes.
• To compare breast cancer subtypes between diabetic and non-diabetic women.

Main Methods:

• Cross-sectional study of invasive breast cancer patients diagnosed between 2000-2010.
• Tumor tissue analyzed via immunohistochemistry for key biomarkers (ER, PR, HER2, Ki67, etc.).
• Multivariable logistic regression used to analyze associations between diabetes/insulin treatment and clinicopathological subtypes.

Main Results:

• No significant differences in morphology or grade between diabetic and non-diabetic women.
• Premenopausal women with diabetes showed a trend towards PR-negative, HER2-negative, and basal-like tumors.
• Associations remained similar in size but less significant after adjusting for age and BMI.

Conclusions:

• No definitive evidence that diabetes or insulin treatment leads to different breast cancer subtypes overall.
• A tendency for hormone receptor-negative tumors was observed in premenopausal women with diabetes, associated with poorer prognosis.