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Cancer Research and Treatment > Accepted Articles
doi: https://doi.org/10.4143/crt.2018.705    [Accepted]
Television Viewing Time and Breast Cancer Incidence for Japanese Premenopausal and Postmenopausal Women: The JACC Study
Jinhong Cao1, Ehab Salah Eshak1,2, Keyang Liu1, Isao Muraki1, Renzhe Cui1, Hiroyasu Iso1, Akiko Tamakoshi3, JACC Study Group
1Public Health, Department of Social Medicine, Osaka University Graduate School of Medicine, Osaka, Japan
2Department of Public Health, Community and Preventive Medicine, Faculty of Medicine, Minia University, Minia, Egypt
3Department of Public Health, Faculty of Medicine, Hokkaido University, Sapporo, Japan
Correspondence  Hiroyasu Iso ,Tel: 81-6-6879-3911, Fax: 81-6-6879-3919 , Email: iso@pbhel.med.osaka-u.ac.jp
Received: December 21, 2018;  Accepted: March 16, 2019.  Published online: March 21, 2019.
The evidence on effects of TV viewing time among premenopausal and postmenopausal women for breast cancer risk remains controversial and limited.
Materials and Methods
A prospective study encompassing 33,276 (17,568 premenopausal, and 15,708 postmenopausal) women aged 40-79 years in whom TV viewing time, menstrual and reproductive histories were determined by a self-administered questionnaire. The follow-up was from 1988 to 2009 and hazard ratios (HRs) with 95% confidence intervals (CIs) of breast cancer incidence were calculated for longer TV viewing time in reference to shorter TV viewing time by Cox proportional hazard models.
During 16.8-year median follow-up, we found positive associations between TV viewing time and breast cancer incidence with a borderline significant trend among total women and a significant trend among postmenopausal women. Among total women, the multivariable HRs (95% CIs) for risk of breast cancer in reference to < 1.5 hr/day of TV viewing time were 0.89 (0.59-1.34) for 1.5 to < 3.0 hr/day, 1.19 (0.82-1.74) for 3.0 to < 4.5 hr/day, and 1.45 (0.91-2.32) for ≥ 4.5 hr/day (p for trend=0.053) and among postmenopausal women, the corresponding risk estimates were 1.10 (0.42-2.88), 2.54 (1.11-5.80), and 2.37 (0.92-6.10) (p for trend=0.009), respectively.
Prolonged TV viewing time was associated with increased risk of breast cancer, especially among postmenopausal women.
Key words: Television viewing time, Breast neoplasms, Incidence, Cohort study, Postmenopausal, Body mass index, Japan
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