Erschienen in:
04.06.2022 | Clinical trial
Association between body mass index and incidence of breast cancer in premenopausal women: a Japanese nationwide database study
verfasst von:
Takaaki Konishi, Michimasa Fujiogi, Nobuaki Michihata, Hiroki Matsui, Masahiko Tanabe, Yasuyuki Seto, Hideo Yasunaga
Erschienen in:
Breast Cancer Research and Treatment
|
Ausgabe 2/2022
Einloggen, um Zugang zu erhalten
Abstract
Purpose
The association between body mass index (BMI) and the incidence of premenopausal breast cancer in the Asian population remains unclear. We investigated this association using data from a Japanese nationwide administrative database.
Methods
We retrospectively identified 785,703 females aged < 45 years with available health checkup data on BMI from January 2005 and April 2020 from a Japanese nationwide database. Cox proportional hazards model was used to estimate hazard ratios for breast cancer (total breast cancer, breast cancer with hormonal drug and trastuzumab administration, and breast cancer by age ≤ 45 years) associated with BMI recorded at the first health checkup. We conducted restricted cubic spline analysis without BMI categorization to investigate potential nonlinear associations with adjustment for backgrounds such as smoking and alcohol consumption.
Results
Overall, the median BMI was 20.5 (interquartile range [IQR], 18.9–22.7) kg/m2, and the median age was 37 (IQR, 29–41) years. Breast cancer occurred in 5597 participants (0.71%) at a median age of 44 (IQR, 42–46) years during a median follow-up of 1034 (IQR, 634–1779) days. A BMI of ≥ 22.0 kg/m2 was significantly associated with lower incidences of total breast cancer, breast cancer with hormonal drug administration, and breast cancer by age ≤ 45 years, whereas no significant associations were observed for breast cancer with trastuzumab administration.
Conclusion
This study, which used a Japanese nationwide database, demonstrated that BMI was inversely associated with premenopausal breast cancer development in Japanese women, similar to that observed in Western women.