Abstract
Background
The aim of this analysis in a pilot study population was to investigate whether we can verify seemingly harmful lifestyle factors such as nicotine and alcohol indulgence, obesity, and physical inactivity, as well as a low socioeconomic status for increased cancer prevalence in a cohort of BRCA 1 and 2 mutation carriers.
Methods
The analysis data are derived from 68 participants of the lifestyle intervention study LIBRE-1, a randomized, prospective trial that aimed to test the feasibility of a lifestyle modification in BRCA 1 and 2 mutation carriers. At study entry, factors such as medical history, lifestyle behavior, and socioeconomic status were retrospectively documented by interview and the current BMI was determined by clinical examination. The baseline measurements were compared within the cohort, and presented alongside reference values for the German population.
Results
Study participants indicating a higher physical activity during their adolescence showed a significantly lower cancer prevalence (p = 0.019). A significant difference in cancer occurrence was observed in those who smoked prior to the disease, and those who did not smoke (p < 0.001). Diseased mutation carriers tended to have a lower BMI compared to non-diseased mutation carriers (p = 0.079), whereas non-diseased revealed a significantly higher physical activity level than diseased mutation carriers (p = 0.046).
Discussion
The present data in this small cohort of 68 mutation carriers suggest that smoking and low physical activity during adolescence are risk factors for developing breast cancer in women with BRCA1 or BRCA2 mutation. Further data of the ongoing LIBRE 2 study are necessary to confirm these findings in a larger cohort of 600 mutation carriers.
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SG: data collection/analysis and manuscript writing. MY-D: data collection/analysis and manuscript editing. RD: data collection and manuscript writing/editing. JL: manuscript editing. MU: manuscript editing. CE: data collection and manuscript editing. KP: manuscript editing. MB: manuscript editing. MS: project development and manuscript editing. TS: manuscript editing. BW: manuscript editing. KR: manuscript editing. ND: manuscript editing. RS: manuscript editing. SCB: project development and manuscript editing. MH: project development and manuscript editing. MK: project development, funding acquisition, project manager, and manuscript editing.
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Funding
This study was funded by the German Cancer Aid (Deutsche Krebshilfe), Project number: 110013.
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There is no conflict of interest.
Ethical approval
All procedures performed in the LIBRE Study involving human participants were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This chapter does not contain any studies with animals performed by any of the authors.
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Informed consent was obtained from all individual participants included in the study.
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Grill, S., Yahiaoui-Doktor, M., Dukatz, R. et al. Smoking and physical inactivity increase cancer prevalence in BRCA-1 and BRCA-2 mutation carriers: results from a retrospective observational analysis. Arch Gynecol Obstet 296, 1135–1144 (2017). https://doi.org/10.1007/s00404-017-4546-y
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DOI: https://doi.org/10.1007/s00404-017-4546-y