History of benign breast disease and risk of breast cancer among women in China: a case-control study.
BACKGROUND
Data from the Shanghai Breast Cancer Study were analyzed to evaluate the relationship between benign breast disease (BBD) and breast cancer among Chinese women with a self-report of physician-diagnosed BBD.


METHODS
Study participants consisted of 3,452 breast cancer cases and 3,474 population controls recruited by the Shanghai Breast Cancer Study. In-person interviews were conducted to collect information on demographics and suspected risk factors for breast cancer, including a detailed history of BBD. Unconditional logistic regression was used to derive adjusted odds ratios (OR(adj)) and 95% confidence intervals (CI) for the association between self-reported BBD and breast cancer.


RESULTS
Women with breast cancer were significantly more likely to have a self-reported history of BBD including lobular proliferation (OR(adj) = 1.6; 95% CI 1.4-1.8), fibroadenoma (OR(adj) = 1.9; 95% CI 1.6-2.3), and other BBD (OR(adj) = 1.6; 95% CI 1.3-2.1). Breast cancer risk was lower for surgically treated fibroadenoma as compared to non-surgically treated and higher for other BBDs that were surgically treated versus non-surgically treated.


CONCLUSIONS
Our results suggest that personal history of BBD is associated with an increased risk of future breast cancer among women in China. Surgical intervention for fibroadenoma may reduce the risk.
Dorjgochoo
Tsogzolmaa
T
Department of Medicine, Vanderbilt Epidemiology Center, Institute of Medicine & Public Health, Vanderbilt University Medical Center and Vanderbilt-Ingram Cancer Center, Sixth Floor, Suite 600, 2525 West End Avenue, Nashville, TN 37203-1738, USA.
Deming
Sandra L
SL
Gao
Yu-Tang
YT
Lu
Wei
W
Zheng
Ying
Y
Ruan
Zhixian
Z
Zheng
Wei
W
Shu
Xiao Ou
XO
D000328:Adult; D000368:Aged; D001941:Breast Diseases / Q000150:complications* / Q000453:epidemiology; D001943:Breast Neoplasms / Q000453:epidemiology / Q000209:etiology*; D016022:Case-Control Studies; D002681:China / Q000453:epidemiology; D005260:Female; D018226:Fibroadenoma / Q000150:complications / Q000453:epidemiology; D006801:Humans; D008875:Middle Aged; D011379:Prognosis; D012307:Risk Factors