CYP3A7*1C allele: linking premenopausal oestrone and progesterone levels with risk of hormone receptor-positive breast cancers

Nichola Johnson*, Sarah Maguire, Anna Morra, Pooja Middha Kapoor, Katarzyna Tomczyk, Michael E. Jones, Minouk J. Schoemaker, Clare Gilham, Manjeet K. Bolla, Qin Wang, Joe Dennis, Thomas U. Ahearn, Irene L. Andrulis, Hoda Anton-Culver, Natalia N. Antonenkova, Volker Arndt, Kristan J. Aronson, Annelie Augustinsson, Caroline Baynes, Laura E.Beane FreemanMatthias W. Beckmann, Javier Benitez, Marina Bermisheva, Carl Blomqvist, Bram Boeckx, Natalia V. Bogdanova, Stig E. Bojesen, Hiltrud Brauch, Hermann Brenner, Barbara Burwinkel, Daniele Campa, Federico Canzian, Jose E. Castelao, Stephen J. Chanock, Georgia Chenevix-Trench, Christine L. Clarke, Anne Lise Børresen-Dale, Grethe I.Grenaker Alnæs, Kristine K. Sahlberg, Lars Ottestad, Rolf Kåresen, Ellen Schlichting, Marit Muri Holmen, Toril Sauer, Vilde Haakensen, Margit Riis, Henrik Flyger, Sune F. Nielsen, Børge G. Nordestgaard, Christopher Scott, NBCS Collaborators, AOCS Group, ABCTB Investigators, kConFab Investigators

*Corresponding author for this work

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Abstract

Background: Epidemiological studies provide strong evidence for a role of endogenous sex hormones in the aetiology of breast cancer. The aim of this analysis was to identify genetic variants that are associated with urinary sex-hormone levels and breast cancer risk. Methods: We carried out a genome-wide association study of urinary oestrone-3-glucuronide and pregnanediol-3-glucuronide levels in 560 premenopausal women, with additional analysis of progesterone levels in 298 premenopausal women. To test for the association with breast cancer risk, we carried out follow-up genotyping in 90,916 cases and 89,893 controls from the Breast Cancer Association Consortium. All women were of European ancestry. Results: For pregnanediol-3-glucuronide, there were no genome-wide significant associations; for oestrone-3-glucuronide, we identified a single peak mapping to the CYP3A locus, annotated by rs45446698. The minor rs45446698-C allele was associated with lower oestrone-3-glucuronide (−49.2%, 95% CI −56.1% to −41.1%, P = 3.1 × 10–18); in follow-up analyses, rs45446698-C was also associated with lower progesterone (−26.7%, 95% CI −39.4% to −11.6%, P = 0.001) and reduced risk of oestrogen and progesterone receptor-positive breast cancer (OR = 0.86, 95% CI 0.82–0.91, P = 6.9 × 10–8). Conclusions: The CYP3A7*1C allele is associated with reduced risk of hormone receptor-positive breast cancer possibly mediated via an effect on the metabolism of endogenous sex hormones in premenopausal women.

Original languageEnglish
JournalBritish Journal of Cancer
Volume124
Issue number4
Pages (from-to)842-854
Number of pages13
ISSN0007-0920
DOIs
Publication statusPublished - 2021

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