Abstract
Purpose: We evaluated the association of percent mammographic density (PMD), absolute dense area (DA), and non-dense area (NDA) with risk of “intrinsic” molecular breast cancer (BC) subtypes. Methods: We pooled 3492 invasive BC and 10,148 controls across six studies with density measures from prediagnostic, digitized film-screen mammograms. We classified BC tumors into subtypes [63% Luminal A, 21% Luminal B, 5% HER2 expressing, and 11% as triple negative (TN)] using information on estrogen receptor (ER), progesterone receptor (PR), human epidermal growth factor receptor 2 (HER2), and tumor grade. We used polytomous logistic regression to calculate odds ratio (OR) and 95% confidence intervals (CI) for density measures (per SD) across the subtypes compared to controls, adjusting for age, body mass index and study, and examined differences by age group. Results: All density measures were similarly associated with BC risk across subtypes. Significant interaction of PMD by age (P = 0.001) was observed for Luminal A tumors, with stronger effect sizes seen for younger women < 45 years (OR = 1.69 per SD PMD) relative to women of older ages (OR = 1.53, ages 65–74, OR = 1.44 ages 75 +). Similar but opposite trends were seen for NDA by age for risk of Luminal A: risk for women: < 45 years (OR = 0.71 per SD NDA) was lower than older women (OR = 0.83 and OR = 0.84 for ages 65–74 and 75 + , respectively) (P < 0.001). Although not significant, similar patterns of associations were seen by age for TN cancers. Conclusions: Mammographic density measures were associated with risk of all “intrinsic” molecular subtypes. However, findings of significant interactions between age and density measures may have implications for subtype-specific risk models.
Original language | English |
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Pages (from-to) | 215-224 |
Number of pages | 10 |
Journal | Breast Cancer Research and Treatment |
Volume | 187 |
Issue number | 1 |
DOIs | |
State | Published - May 2021 |
Bibliographical note
Publisher Copyright:© 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC part of Springer Nature.
Keywords
- Breast cancer
- Mammographic density
- “Intrinsic” molecular subtypes
- Breast Neoplasms/diagnostic imaging
- Receptors, Progesterone/genetics
- Receptors, Estrogen
- Humans
- Middle Aged
- Risk Factors
- Receptor, ErbB-2/genetics
- Biomarkers, Tumor
- Case-Control Studies
- Female
- Aged
- Breast Density
ASJC Scopus subject areas
- Oncology
- Cancer Research