Polygenic risk scores and breast and epithelial ovarian cancer risks for carriers of BRCA1 and BRCA2 pathogenic variants

Daniel R Barnes, Matti A Rookus, Lesley McGuffog, Goska Leslie, Thea M Mooij, Joe Dennis, Nasim Mavaddat, Julian Adlard, Munaza Ahmed, Kristiina Aittomäki, Nadine Andrieu, Irene L Andrulis, Norbert Arnold, Banu K Arun, Jacopo Azzollini, Judith Balmaña, Rosa B Barkardottir, Daniel Barrowdale, Javier Benitez, Pascaline BerthetKatarzyna Białkowska, Amie M Blanco, Marinus J Blok, Bernardo Bonanni, Susanne E Boonen, Åke Borg, Aniko Bozsik, Angela R Bradbury, Paul Brennan, Carole Brewer, Joan Brunet, Saundra S Buys, Trinidad Caldés, Maria A Caligo, Ian Campbell, Lise Lotte Christensen, Wendy K Chung, Kathleen B M Claes, Chrystelle Colas, Marie-Agnès Collonge-Rame, Jackie Cook, Mary B Daly, Rosemarie Davidson, Miguel de la Hoya, Robin de Putter, Capucine Delnatte, Peter Devilee, Orland Diez, Yuan Chun Ding, Inge Sokilde Pedersen

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Abstract

PURPOSE: We assessed the associations between population-based polygenic risk scores (PRS) for breast (BC) or epithelial ovarian cancer (EOC) with cancer risks for BRCA1 and BRCA2 pathogenic variant carriers.

METHODS: Retrospective cohort data on 18,935 BRCA1 and 12,339 BRCA2 female pathogenic variant carriers of European ancestry were available. Three versions of a 313 single-nucleotide polymorphism (SNP) BC PRS were evaluated based on whether they predict overall, estrogen receptor (ER)-negative, or ER-positive BC, and two PRS for overall or high-grade serous EOC. Associations were validated in a prospective cohort.

RESULTS: The ER-negative PRS showed the strongest association with BC risk for BRCA1 carriers (hazard ratio [HR] per standard deviation = 1.29 [95% CI 1.25-1.33], P = 3×10-72). For BRCA2, the strongest association was with overall BC PRS (HR = 1.31 [95% CI 1.27-1.36], P = 7×10-50). HR estimates decreased significantly with age and there was evidence for differences in associations by predicted variant effects on protein expression. The HR estimates were smaller than general population estimates. The high-grade serous PRS yielded the strongest associations with EOC risk for BRCA1 (HR = 1.32 [95% CI 1.25-1.40], P = 3×10-22) and BRCA2 (HR = 1.44 [95% CI 1.30-1.60], P = 4×10-12) carriers. The associations in the prospective cohort were similar.

CONCLUSION: Population-based PRS are strongly associated with BC and EOC risks for BRCA1/2 carriers and predict substantial absolute risk differences for women at PRS distribution extremes.

OriginalsprogEngelsk
TidsskriftGenetics in Medicine
Vol/bind22
Udgave nummer10
Sider (fra-til)1653-1666
Antal sider14
ISSN1098-3600
DOI
StatusUdgivet - okt. 2020

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