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Factors influencing breast changes after pregnancy
Claudia Rauh1, Florian Faschingbauer, Lothar Haeberle
1Department of Gynecology and Obstetrics, University Breast Center for Franconia, Erlangen University Hospital, Friedrich Alexander University of Erlangen-Nuremberg, Erlangen, Germany.
Summary
Pregnancy can alter breast size and stiffness, influencing breast cancer risk. Factors like age at first full-term pregnancy and BMI predict these post-pregnancy breast changes.
Area of Science:
- Reproductive Health
- Oncology
- Biostatistics
Background:
- Pregnancy and breastfeeding are known to reduce breast cancer (BC) risk.
- Changes in mammographic density are a potential mechanism, but other factors influencing breast changes post-pregnancy require investigation.
Purpose of the Study:
- To investigate factors influencing changes in breast size and stiffness after pregnancy.
- To identify predictors of post-pregnancy breast alterations.
Main Methods:
- A cohort of 559 women who gave birth between 1996-1999 completed a questionnaire assessing breast size and stiffness changes.
- Factors analyzed included pre-pregnancy BMI, weight gain, age at first full-term pregnancy (FFTP), number of pregnancies, breastfeeding, and paternal BMI.
Main Results:
- 21.8% reported decreased breast size, 35.1% reported increased size.
- 66.4% reported decreased breast stiffness, 5% reported increased stiffness.
- Age at FFTP, BMI changes, and time since FFTP predicted breast size changes. Age at FFTP, pre-pregnancy BMI, time since FFTP, breastfeeding, and parity predicted breast stiffness.
Conclusions:
- Post-pregnancy breast changes in size and stiffness are multifactorial.
- These changes are influenced by variables also considered breast cancer risk factors.
- Further research is needed to understand how individual breast responses to pregnancy interact with BC risk reduction.
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