Active smoking, passive smoking, and breast cancer risk: Findings from the Japan Collaborative Cohort Study for Evaluation of Cancer Risk

Yingsong Lin, Shogo Kikuchi, Koji Tamakoshi, Kenji Wakai, Takaaki Kondo, Yoshimitsu Niwa, Hiroshi Yatsuya, Kazuko Nishio, Sadao Suzuki, Shinkan Tokudome, Akio Yamamoto, Hideaki Toyoshima, Mitsuru Mori, Akiko Tamakoshi, Yutaka Motohashi, Ichiro Tsuji, Yosikazu Nakamura, Hiroyasu Iso, Haruo Mikami, Yutaka InabaYoshiharu Hoshiyama, Hiroshi Suzuki, Hiroyuki Shimizu, Yoshinori Ito, Shuji Hashimoto, Akio Koizumi, Takashi Kawamura, Yoshiyuki Watanabe, Tsuneharu Miki, Chigusa Date, Kiyomi Sakata, Takayuki Nose, Norihiko Hayakawa, Takesumi Yoshimura, Akira Shibata, Naoyuki Okamoto, Hideo Shio, Yoshiyuki Ohno, Tomoyuki Kitagawa, Toshio Kuroki, Kazuo Tajima

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

Background: Evidence is lacking regarding the relationship between cigarette smoking and breast cancer in Japanese women. We examined the association between breast cancer incidence and active and passive smoking in the Japan Collaborative Cohort Study for Evaluation of Cancer Risk. Methods: Our study comprised 34,401 women aged 40-79 years who had not been diagnosed previously with breast cancer and who provided information on smoking status at baseline (1988-1990). The subjects were followed from enrollment until December 31, 2001. Cox proportional-hazards models were used to estimate the hazard ratio (HR) and 95% confidence interval (CI) for the association between breast cancer incidence and tobacco smoke. Results: During 271,412 person-years of follow-up, we identified 208 incident cases of breast cancer. Active smoking did not increase the risk of breast cancer, with a HR for current smokers of 0.67 (95% CI: 0.32-1.38). Furthermore, an increased risk of breast cancer was not observed in current smokers who smoked a greater number of cigarettes each day. Overall, passive smoking at home or in public spaces was also not associated with an increased risk of breast cancer among nonsmokers. Women who reported passive smoking during childhood had a statistically insignificant increase in risk (HR: 1.24; 95% CI: 0.84-1.85), compared with those who had not been exposed during this time. Conclusion: Smoking may not be associated with an increased risk of breast cancer in this cohort of Japanese women.

Original languageEnglish
Pages (from-to)77-83
Number of pages7
JournalJournal of epidemiology
Volume18
Issue number2
DOIs
Publication statusPublished - 14-05-2008

All Science Journal Classification (ASJC) codes

  • Epidemiology

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    Lin, Y., Kikuchi, S., Tamakoshi, K., Wakai, K., Kondo, T., Niwa, Y., Yatsuya, H., Nishio, K., Suzuki, S., Tokudome, S., Yamamoto, A., Toyoshima, H., Mori, M., Tamakoshi, A., Motohashi, Y., Tsuji, I., Nakamura, Y., Iso, H., Mikami, H., ... Tajima, K. (2008). Active smoking, passive smoking, and breast cancer risk: Findings from the Japan Collaborative Cohort Study for Evaluation of Cancer Risk. Journal of epidemiology, 18(2), 77-83. https://doi.org/10.2188/jea.18.77