Television viewing time and breast cancer incidence for Japanese premenopausal and postmenopausal women: The JACC study

Jinhong Cao, Ehab Salah Eshak, Keyang Liu, Isao Muraki, Renzhe Cui, Hiroyasu Iso, Akiko Tamakoshi, Akiko Tamakoshi, Mitsuru Mori, Yoshihiro Kaneko, Ichiro Tsuji, Yosikazu Nakamura, Hiroyasu Iso, Kazumasa Yamagishi, Haruo Mikami, Michiko Kurosawa, Yoshiharu Hoshiyama, Naohito Tanabe, Koji Tamakoshi, Kenji WakaiShinkan Tokudome, Koji Suzuki, Shuji Hashimoto, Hiroshi Yatsuya, Shogo Kikuchi, Yasuhiko Wada, Takashi Kawamura, Yoshiyuki Watanabe, Kotaro Ozasa, Kazuya Mikami, Chigusa Date, Kiyomi Sakata, Yoichi Kurozawa, Takesumi Yoshimura, Yoshihisa Fujino, Akira Shibata, Naoyuki Okamoto, Hideo Shio

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3 Citations (Scopus)

Abstract

Purpose 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. Results 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. Conclusion Prolonged TV viewing time was associated with increased risk of breast cancer, especially among postmenopausal women.

Original languageEnglish
Pages (from-to)509-1517
Number of pages1009
JournalCancer Research and Treatment
Volume51
Issue number4
DOIs
Publication statusPublished - 2019

All Science Journal Classification (ASJC) codes

  • Oncology
  • Cancer Research

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    Cao, J., Eshak, E. S., Liu, K., Muraki, I., Cui, R., Iso, H., Tamakoshi, A., Tamakoshi, A., Mori, M., Kaneko, Y., Tsuji, I., Nakamura, Y., Iso, H., Yamagishi, K., Mikami, H., Kurosawa, M., Hoshiyama, Y., Tanabe, N., Tamakoshi, K., ... Shio, H. (2019). Television viewing time and breast cancer incidence for Japanese premenopausal and postmenopausal women: The JACC study. Cancer Research and Treatment, 51(4), 509-1517. https://doi.org/10.4143/crt.2018.705