Genetic variation in the estrogen metabolic pathway and mammographic density as an intermediate phenotype of breast cancer

Genetic variation in the estrogen metabolic pathway and mammographic density as an intermediate phenotype of breast cancer

Breast Cancer Research

10.1186/bcr2488

http://breast-cancer-research.com/content/12/2/R19

Celine M Vachon, Fergus J Couch, Christopher G Scott, Pagona Lagiou, Per Hall, Jingmei Li, Louise Eriksson, Keith Humphreys, Kamila Czene, Jianjun Liu, Rulla M Tamimi, Sara Lindström, David J Hunter

09 March 2010

Li et al.: Genetic variation in the estrogen metabolic pathway and mammographic density as an intermediate phenotype of breast cancer. Breast Cancer Research 2010 12:R19.

Introduction: Several studies have examined the effect of genetic variants in genes involved in the estrogen metabolic pathway on mammographic density, but the number of loci studied and the sample sizes evaluated have been small and pathways have not been evaluated comprehensively. In this study, we evaluate the association between mammographic density and genetic variants of the estrogen metabolic pathway. Methods: A total of 239 SNPs in 34 estrogen metabolic genes were studied in 1,731 Swedish women who participated in a breast cancer case-control study, of which 891 were cases and 840 were controls. Film mammograms of the medio-lateral oblique view were digitalized and the software Cumulus was used for computer-assisted semi-automated thresholding of mammographic density. Generalized linear models controlling for possible confounders were used to evaluate the effects of SNPs on mammographic density. Results found to be nominally significant were examined in two independent populations. The admixture maximum likelihood-based global test was performed to evaluate the cumulative effect from multiple SNPs within the whole metabolic pathway and three subpathways for androgen synthesis, androgen-to-estrogen conversion and estrogen removal. Results: Genetic variants of genes involved in estrogen metabolism exhibited no appreciable effect on mammographic density. None of the nominally significant findings were validated. In addition, global analyses on the overall estrogen metabolic pathway and its subpathways did not yield statistically significant results. Conclusions: Overall, there is no conclusive evidence that genetic variants in genes involved in the estrogen metabolic pathway are associated with mammographic density in postmenopausal women.

http://creativecommons.org/licenses/by/3.0/

https://oar.a-star.edu.sg/communities-collections/articles/11524

1465-5411

Genome Institute of Singapore