HRT Use and Breast Cancer Risk in Southern Sweden
Author Information
Author(s): Olsson H, Bladström A, Ingvar C, Möller T R
Primary Institution: Department of Oncology, University Hospital, Lund
Hypothesis
Does hormone replacement therapy (HRT) increase the risk of breast cancer in women?
Conclusion
The study found a significant excess of breast cancer among women who used HRT compared to those who never used it.
Supporting Evidence
- The study included 29,508 women and followed them for breast cancer incidence.
- There were 226,611 person-years of observation.
- A total of 1,145 malignant tumors were recorded during the study.
- The study found a significant excess of breast cancer among HRT users.
- Breast cancer risk increased with longer duration of HRT use.
Takeaway
This study looked at a lot of women to see if using hormone therapy makes them more likely to get breast cancer, and it found that it does.
Methodology
The study followed a cohort of women and analyzed breast cancer incidence in relation to HRT use over time.
Potential Biases
Potential biases related to self-reported HRT use and family history.
Limitations
The study may not account for all confounding factors related to breast cancer risk.
Participant Demographics
Women aged 25–65 from southern Sweden.
Statistical Information
Confidence Interval
95% CI 1.02–1.23
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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