Adiposity, adult weight change and breast cancer risk in postmenopausal Japanese women: the Miyagi Cohort Study.
BACKGROUND
The role of adult weight change in breast cancer (BC) risk is unclear in Japanese women.


METHODS
A total of 10,106 postmenopausal women aged 40-64 years (the Miyagi Cohort) were followed from 1990 to 2003, and 108 BC cases were identified. Hazard ratios (HRs) were estimated according to body mass index (BMI) at the current age and at the of age 20 years, and weight change since age 20 years.


RESULTS
Higher current BMI was associated with an increased risk of BC (P for trend=0.02), whereas higher BMI at the age 20 years was inversely associated with this risk (P for trend=0.002). There was a significant association between weight change since age 20 years and BC risk (P for trend=0.0086). Compared with stable weight, HR was 0.35 for weight loss of 5 kg or more (P for weight loss trend=0.04) and 1.55 for weight gain of 12 kg or more (P for weight gain trend=0.05).


CONCLUSIONS
Adiposity at younger and current age has differential effects on BC risk among postmenopausal women; weight gain in adulthood being associated with an increased, and weight loss with a decreased risk.
Kawai
M
M
Department of Surgical Oncology, Tohoku University Graduate School of Medicine, 1-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi 980-8574, Japan.
Minami
Y
Y
Kuriyama
S
S
Kakizaki
M
M
Kakugawa
Y
Y
Nishino
Y
Y
Ishida
T
T
Fukao
A
A
Tsuji
I
I
Ohuchi
N
N
D050154:Adiposity / Q000502:physiology*; D000328:Adult; D044466:Asian People; D015992:Body Mass Index; D001943:Breast Neoplasms / Q000453:epidemiology*; D005260:Female; D006801:Humans; D008875:Middle Aged; D017698:Postmenopause; D012306:Risk; D015430:Weight Gain; D015431:Weight Loss