Abstract:
:A functional promoter polymorphism in the progesterone receptor (PR) gene previously has been associated with an increased risk of postmenopausal breast cancer. Whether the relationship between genetic variation in PR and risk of breast cancer is modified by postmenopausal hormone (PMH) use is unknown. Thus, we conducted a case-control study nested within the prospective Nurses' Health Study to evaluate if the risk of breast cancer associated with having the +331 A risk allele was modified by PMH use. Genotyping of this SNP was available for 1,664 postmenopausal breast cancer cases and 2,391 controls. Logistic regression was used to estimate the odds ratios (ORs) and 95% confidence intervals (CIs) for breast cancer. Women who were carriers of 1 or both variant A alleles had a 31% increased risk of developing breast cancer (95% CI 1.04-1.65). PMH use significantly modified the association between the +331G/A polymorphism and risk (p-interaction <0.05). Among never users of PMH, women who were variant carriers had a significantly increased risk of breast cancer compared to those with the wild-type genotype (OR = 2.57; 95% CI 1.64-4.02). The +331G/A polymorphism was not associated with breast cancer risk among past (OR = 1.23; 95% CI 0.77-1.97) or current (OR = 1.14; 95% CI 0.84-1.56) PMH users. The data from this large prospective study provide evidence for a 2-fold increased risk of developing postmenopausal breast cancer among never users of PMH with the +331G/A SNP. This finding adds to the evidence that the PR has an important etiologic role in breast cancer and should be evaluated in future studies.
journal_name
Int J Cancerjournal_title
International journal of cancerauthors
Kotsopoulos J,Tworoger SS,De Vivo I,Hankinson SE,Hunter DJ,Willett WC,Chen WYdoi
10.1002/ijc.24477subject
Has Abstractpub_date
2009-10-01 00:00:00pages
1685-91issue
7eissn
0020-7136issn
1097-0215journal_volume
125pub_type
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