Published in:
01-09-2019 | Breast Cancer | Epidemiology
Associations between mammographic density and tumor characteristics in Chinese women with breast cancer
Authors:
Erni Li, Jennifer L. Guida, Yuan Tian, Hyuna Sung, Hela Koka, Mengjie Li, Ariane Chan, Han Zhang, Eric Tang, Changyuan Guo, Joseph Deng, Nan Hu, Ning Lu, Gretchen L. Gierach, Jing Li, Xiaohong R. Yang
Published in:
Breast Cancer Research and Treatment
|
Issue 2/2019
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Abstract
Purpose
Mammographic density (MD) is a strong risk factor for breast cancer, yet its relationship with tumor characteristics is not well established, particularly in Asian populations.
Methods
MD was assessed from a total of 2001 Chinese breast cancer patients using Breast Imaging Reporting and Data System (BI-RADS) categories. Molecular subtypes were defined using immunohistochemical status on ER, PR, HER2, and Ki-67, as well as tumor grade. Multinomial logistic regression was used to test associations between MD and molecular subtype (luminal A = reference) adjusting for age, body mass index (BMI), menopausal status, parity, and nodal status.
Results
The mean age at diagnosis was 51.7 years (SD = 10.7) and the average BMI was 24.7 kg/m2 (SD = 3.8). The distribution of BI-RADS categories was 7.4% A = almost entirely fat, 24.2% B = scattered fibroglandular dense, 49.4% C = heterogeneously dense, and 19.0% D = extremely dense. Compared to women with BI-RADS = A/B, women with BI-RADS = D were more likely to have HER2-enriched tumors (OR = 1.81, 95% CI 1.08–3.06, p = 0.03), regardless of menopausal status. The association was only observed in women with normal (< 25 kg/m2) BMI (OR = 2.43, 95% CI 1.24–4.76, p < 0.01), but not among overweight/obese women (OR: 0.98, 95% CI 0.38–2.52, p = 0.96).
Conclusions
Among Chinese women with normal BMI, higher breast density was associated with HER2-enriched tumors. The results may partially explain the higher proportion of HER2+ tumors previously reported in Asian women.