Breast Cancer Research and Treatment

, Volume 169, Issue 1, pp 125–131 | Cite as

Assessment of potential risk factors for breast cancer in a population in Southern Brazil

  • Juliana Zeni Breyer
  • Eliana Marcia Wendland
  • Natália Luiza Kops
  • Maira Caleffi
  • Luciano Serpa Hammes



The aim of this study is to assess potential risk factors for breast cancer in a population in Southern Brazil and build a multivariate logistic model using these factors for breast cancer risk prediction.


A total of 4242 women between 40 and 69 years of age without a history of breast cancer were selected at primary healthcare facilities in Porto Alegre and submitted to mammographic screening. They were evaluated for potential risk factors.


In all, 73 participants among the 4242 women had a breast cancer diagnosis during the follow-up of the project (10 years). The multivariate analysis considering all the patients aged 40–69 years showed that older age (OR 1.08, 95% CI 1.04–1.12), higher height (OR 1.04, 95% CI 1.01–1.09), and history of previous breast biopsy (OR 2.66, 95% CI 1.38–5.13) were associated with the development of breast cancer. Conversely, the number of pregnancies (OR 0.87, 95% CI 0.78–0.98) and use of hormone replacement therapy (OR 0.39, 95% CI 0.20–0.75) were considered a protective factor. Additionally, we performed an analysis separating the participants into groups of 40–49 and 50–69 years old, since a risk factor could have a specific behavior in these age groups. No additional risk factors were identified within these age brackets, and some factors lost statistical significance.


The risk prediction model indicates that the following variables should be assessed in this specific population: age, height, having had previous breast biopsies, number of pregnancies, and use of hormone replacement therapy. These findings may help to better understand the causal model of breast cancer in Southern Brazil.


Breast cancer Risk factors Mortality Etiology Incidence 


Funding Information

This study was funded by Brazilian Ministry of Health along with the Moinhos de Vento Hospital through the Program for Supporting the Institutional Development of the Public Health System (PROADI-SUS).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflicts of interest.

Informed consent

Informed consent was obtained from all individual participants included in the study.


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Juliana Zeni Breyer
    • 1
  • Eliana Marcia Wendland
    • 1
    • 2
  • Natália Luiza Kops
    • 1
    • 3
  • Maira Caleffi
    • 1
    • 4
  • Luciano Serpa Hammes
    • 1
  1. 1.Hospital Moinhos de VentoPorto AlegreBrazil
  2. 2.Department of Public HealthFederal University of Health Sciences of Porto Alegre (UFCSPA)Porto AlegreBrazil
  3. 3.Post-Graduate Program in EndocrinologyUniversidade Federal do Rio Grande do Sul (UFRGS)Porto AlegreBrazil
  4. 4.Núcleo Mama Porto AlegrePorto AlegreBrazil

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