Mendelian randomisation study of height and body mass index as modifiers of ovarian cancer risk in 22,588 BRCA1 and BRCA2 mutation carriers

KConFab Investigators, HEBON Investigators, GEMO Study Collaborators, EMBRACE Collaborators, Frank Qian, Matti A. Rookus, Goska Leslie, Harvey A. Risch, Mark H. Greene, Cora M. Aalfs, Muriel A. Adank, Julian Adlard, Bjarni A. Agnarsson, Munaza Ahmed, Kristiina Aittomäki, Irene L. Andrulis, Norbert Arnold, Banu K. Arun, Margreet G.E.M. Ausems, Jacopo AzzolliniDaniel Barrowdale, Julian Barwell, Javier Benitez, Katarzyna Białkowska, Valérie Bonadona, Julika Borde, Ake Borg, Angela R. Bradbury, Joan Brunet, Saundra S. Buys, Trinidad Caldés, Maria A. Caligo, Ian Campbell, Jonathan Carter, Jocelyne Chiquette, Wendy K. Chung, Kathleen B.M. Claes, J. Margriet Collée, Marie Agnès Collonge-Rame, Fergus J. Couch, Mary B. Daly, Capucine Delnatte, Orland Diez, Susan M. Domchek, Cecilia M. Dorfling, Jacqueline Eason, Douglas F. Easton, Ros Eeles, Christoph Engel, D. Gareth Evans, Laurence Faivre, Marco Montagna, Paolo Radice, Silvia Tognazzo, Amanda Toland, CIMBA CIMBA

Research output: Contribution to journalArticlepeer-review


Background: Height and body mass index (BMI) are associated with higher ovarian cancer risk in the general population, but whether such associations exist among BRCA1/2 mutation carriers is unknown. Methods: We applied a Mendelian randomisation approach to examine height/BMI with ovarian cancer risk using the Consortium of Investigators for the Modifiers of BRCA1/2 (CIMBA) data set, comprising 14,676 BRCA1 and 7912 BRCA2 mutation carriers, with 2923 ovarian cancer cases. We created a height genetic score (height-GS) using 586 height-associated variants and a BMI genetic score (BMI-GS) using 93 BMI-associated variants. Associations were assessed using weighted Cox models. Results: Observed height was not associated with ovarian cancer risk (hazard ratio [HR]: 1.07 per 10-cm increase in height, 95% confidence interval [CI]: 0.94–1.23). Height-GS showed similar results (HR = 1.02, 95% CI: 0.85–1.23). Higher BMI was significantly associated with increased risk in premenopausal women with HR = 1.25 (95% CI: 1.06–1.48) and HR = 1.59 (95% CI: 1.08–2.33) per 5-kg/m2 increase in observed and genetically determined BMI, respectively. No association was found for postmenopausal women. Interaction between menopausal status and BMI was significant (Pinteraction <0.05). Conclusion: Our observation of a positive association between BMI and ovarian cancer risk in premenopausal BRCA1/2 mutation carriers is consistent with findings in the general population.
Original languageEnglish
Pages (from-to)180-192
Number of pages13
JournalBritish Journal of Cancer
Issue number2
Publication statusPublished - Jul 16 2019


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