Statin use as a moderator on the association between metformin and breast cancer risk in women with type 2 diabetes mellitus
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View abstract on PubMed
Summary
This summary is machine-generated.Metformin and statin use may reduce breast cancer risk in women with type 2 diabetes mellitus. Combining these medications shows a stronger protective effect, suggesting a potential breast cancer prevention strategy.
Area Of Science
- Endocrinology
- Oncology
- Pharmacology
Background
- Metformin and statins are investigated for breast cancer prevention, but evidence on their combined effects is limited.
- Existing research lacks comprehensive data on the interaction between metformin and statins concerning breast cancer risk.
Purpose Of The Study
- To determine if metformin's effect on breast cancer incidence differs based on statin use in women with type 2 diabetes mellitus.
- To explore the synergistic or modifying effects of combined metformin and statin therapy on breast cancer risk.
Main Methods
- A cohort of women with type 2 diabetes mellitus (T2DM) and no prior cancer history was followed from 1998-2014 (ZODIAC project).
- Person-time analysis with annual updates of cumulative medication use was performed.
- Extended Cox proportional hazards models were used to calculate adjusted hazard ratios (HR) and 95% confidence intervals (CI).
Main Results
- A median follow-up of 5 years revealed 515 breast cancer diagnoses among 29,498 women.
- Each additional year of metformin or statin use was associated with decreased breast cancer incidence, though the effect diminished over time.
- Statin use significantly modified metformin's effect: 3 years of statin use with 1 year of metformin reduced risk (HR: 0.88, 95% CI: 0.84-0.93), while non-statin users showed no significant risk reduction (HR: 0.96, 95% CI: 0.89-1.04).
Conclusions
- Extended use of metformin or statins individually provides breast cancer protection for women with T2DM.
- Metformin demonstrates an enhanced protective effect against breast cancer when used concurrently with statins.
- Combined metformin and statin therapy emerges as a promising strategy for breast cancer prevention in this population.
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