NDLI: Risk factors by molecular subtypes of breast cancer across a population-based study of women 56 years or younger

Content Provider	PubMed Central
Author	Gaudet, Mia M. Press, Michael F. Haile, Robert W. Lynch, Charles F. Glaser, Sally L. Schildkraut, Joellen Gammon, Marilie D. Thompson, W. Douglas Bernstein, Jonine L.
Copyright Year	2011
Abstract	Differences in incidence, prognosis, and treatment response suggest gene expression patterns may discern breast cancer subtypes with unique risk factor profiles; however, previous results were based predominantly on older women. In this study, we examined similar relationships in women ≤56 years, classified by immunohistochemical staining for estrogen receptor, progesterone receptor, and human epidermal growth factor receptor-2 for 890 breast cancer cases and 3,432 frequency-matched population-based controls. Odds ratios (OR) and 95% confidence intervals (CI) for tumor subtypes were calculated using multivariate polytomous regression models. A total of 455 (51.1%) tumors were considered luminal A, 72 (8.1%) luminal B, 117 (13.1%) non-luminal HER-2/neu+,and 246 (27.6%) triple negative. Triple negative tumors were associated with breast feeding duration (per 6 months: OR = 0.76, 95% CI 0.64–0.90). Among pre-menopausal women, increasing body size was more strongly associated with luminal B (OR = 1.73, 95% CI 1.07–2.77) and triple negative tumors (OR = 1.67, 95% CI 1.22–2.28). A history of benign breast disease was associated only with increased risk of luminal A tumors (OR = 1.89, 95% CI 1.43–2.50). A family history of breast cancer was a risk factor for luminal A tumors (OR = 1.93, 95% CI 1.38–2.70) regardless of age, and triple negative tumors with higher risks for women <45 (OR = 5.02, 95% CI 2.82–8.92; P for age interaction = 0.005). We found that little-to-no breastfeeding and high BMI were associated with increased risk of triple negative breast cancer. That some risk factors differ by molecular subtypes suggests etiologic heterogeneity in breast carcinogenesis among young women.
Related Links	http://dx.doi.org/10.1007/s10549-011-1616-x
Ending Page	597
Page Count	11
Starting Page	587
File Format	PDF
ISSN	01676806
e-ISSN	15737217
Journal	Breast cancer research and treatment
Issue Number	2
Volume Number	130
Language	English
Publisher Date	2011-11-01
Access Restriction	Open
Subject Keyword	Cancer Research Oncology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Cancer Research Oncology

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