Title |
Variation in breast cancer risk associated with factors related to pregnancies according to truncating mutation location, in the French National BRCA1 and BRCA2 mutations carrier cohort (GENEPSO)
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Published in |
Breast Cancer Research, July 2012
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DOI | 10.1186/bcr3218 |
Pubmed ID | |
Authors |
Julie Lecarpentier, Catherine Noguès, Emmanuelle Mouret-Fourme, Marion Gauthier-Villars, Christine Lasset, Jean-Pierre Fricker, Olivier Caron, Dominique Stoppa-Lyonnet, Pascaline Berthet, Laurence Faivre, Valérie Bonadona, Bruno Buecher, Isabelle Coupier, Laurence Gladieff, Paul Gesta, François Eisinger, Marc Frénay, Elisabeth Luporsi, Alain Lortholary, Chrystelle Colas, Catherine Dugast, Michel Longy, Pascal Pujol, Julie Tinat, GENEPSO, Rosette Lidereau, Nadine Andrieu |
Abstract |
ABSTRACT: INTRODUCTION: Mutations in BRCA1 and BRCA2 confer a high risk of breast cancer (BC), but the magnitude of this risk seems to vary according to the study and various factors. Although controversial, there are data to support the hypothesis of allelic risk heterogeneity. METHODS: We assessed variation in BC risk according to factors related to pregnancies by location of mutation in the homogeneous risk region of BRCA1 and BRCA2 in 990 women in the French study GENEPSO by using a weighted Cox regression model. RESULTS: Our results confirm the existence of the protective effect of an increasing number of full-term pregnancies (FTPs) toward BC among BRCA1 and BRCA2 mutation carriers (≥3 versus 0 FTPs: hazard ratio (HR) = 0.51, 95% confidence interval (CI) = 0.33 to 0.81). Additionally, the HR shows an association between incomplete pregnancies and a higher BC risk, which reached 2.39 (95% CI = 1.28 to 4.45) among women who had at least three incomplete pregnancies when compared with women with zero incomplete pregnancies. This increased risk appeared to be restricted to incomplete pregnancies occurring before the first FTP (HR = 1.77, 95% CI = 1.19 to 2.63). We defined the TMAP score (defined as the Time of Breast Mitotic Activity during Pregnancies) to take into account simultaneously the opposite effect of full-term and interrupted pregnancies. Compared with women with a TMAP score of less than 0.35, an increasing TMAP score was associated with a statistically significant increase in the risk of BC (P trend = 0.02) which reached 1.97 (95% CI = 1.19 to 3.29) for a TMAP score >0.5 (versus TMAP ≤0.35). All these results appeared to be similar in BRCA1 and BRCA2. Nevertheless, our results suggest a variation in BC risk associated with parity according to the location of the mutation in BRCA1. Indeed, parity seems to be associated with a significantly decreased risk of BC only among women with a mutation in the central region of BRCA1 (low-risk region) (≥1 versus 0 FTP: HR = 0.27, 95% CI = 0.13 to 0.55) (Pinteraction <10-3). CONCLUSIONS: Our findings show that, taking into account environmental and lifestyle modifiers, mutation position might be important for the clinical management of BRCA1 and BRCA2 mutation carriers and could also be helpful in understanding how BRCA1 and BRCA2 genes are involved in BC. |
X Demographics
Geographical breakdown
Country | Count | As % |
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Unknown | 2 | 100% |
Demographic breakdown
Type | Count | As % |
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Members of the public | 2 | 100% |
Mendeley readers
Geographical breakdown
Country | Count | As % |
---|---|---|
Unknown | 52 | 100% |
Demographic breakdown
Readers by professional status | Count | As % |
---|---|---|
Student > Master | 8 | 15% |
Student > Ph. D. Student | 7 | 13% |
Other | 5 | 10% |
Student > Postgraduate | 5 | 10% |
Student > Bachelor | 4 | 8% |
Other | 12 | 23% |
Unknown | 11 | 21% |
Readers by discipline | Count | As % |
---|---|---|
Medicine and Dentistry | 14 | 27% |
Agricultural and Biological Sciences | 13 | 25% |
Biochemistry, Genetics and Molecular Biology | 6 | 12% |
Pharmacology, Toxicology and Pharmaceutical Science | 2 | 4% |
Engineering | 2 | 4% |
Other | 3 | 6% |
Unknown | 12 | 23% |