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Abstract

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·ÁÁ® ÀÖ´Ù.

Purpose: Because the breast cancer is one of the major causes of mortality among
women, it is important to Identify modifiable risk factors for this disease. Some reported
that overweight/obesity is a risk factor for breast cancer, but the results are not
consistent. Human breast cancer has different characteristics according to the status of
menopause (premenopause and postmenopause). For the premenopaused women, the
majority of the relevant prospective studies support an inverse relationship between body
mass index and the development of breast cancer. In contrast, for the postmenopaused
women, a positive relationship between body mass index and development of breast
cancer has been reported in only half of prospective studies on this topic. This study
was undertaken to determine the role of body size and body mass index by status of
menopause in development of breast cancer in Korea using retrospective case-control
study.
Materials and Methods: The breast cancer cases (n=683) and controls (n=501) were
recruited from January 1993 to April 1998 at the Asan Medical Center. The authors
collected information on demographic, reproductive and anthropometric characteristics by
interviews. Quetelet's index was calculated using height and weight. Multiple logistic
regression was done to estimate adjusted odds ratios (ORs) by menopausal status,
controlling age, age at first full-term pregnancy, age at menarche, number of parity,
family history of breast cancer.
Results: Overall, there was a moderate, but significant association between obesity and
breast cancer. Among premenopausal women, in comparison with women whose weights
were less than 50 §¸, the ORs for the upper quintile group of weight was 1.71 (95%
confidence interval (CI), 1.01¡­2.89). The heaviest premenopausal women had a higher
risk (OR=1.16, 95% CI, 1.05¡­1.29, P=0.005). The adjusted OR for the highest quintile of
BMI relative to the lowest was 2.02 (95% CI, 1.18 ¡­3.45). Higher body mass index was
significantly associated with increased risk of premenopausal breast cancer (OR=1.08,
95% CI, 1.02¡­1.15, P=0.006). Among postmenopausal women, higher body mass index
and weight were associated with increased risk of breast cancer. In comparison with
women whose weights were less than 50 §¸, the OR for the upper quintile group of
weight was 2.08 (95% CI, 1.06¡­4.08). The adjusted OR for the highest quintile of BMI
relative to the lowest was 2.02 (95% CI, 1.02¡­4.01).
Conclusion: Our findings suggest that overweight/obesity may play an important role
in the incidence of premenopausal and postmenopausal breast cancer in Korea.

Å°¿öµå

Breast cancer; Menopause; Obesity (Body Mass Index);

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KoreaMed
KAMS