Active and passive smoking and breast cancer in Japan : a pooled analysis of nine population-based cohort studies
© The Author(s) 2024; all rights reserved. Published by Oxford University Press on behalf of the International Epidemiological Association..
BACKGROUND: Epidemiological studies have shown inconsistent results regarding the link between smoking and breast cancer risk, despite the biological plausibility of a positive association.
METHODS: Participants were 166 611 women from nine prospective cohort studies in Japan which launched in 1984-1994 and followed for 8-22 years. Information on smoking and secondhand smoke was obtained through self-administered baseline questionnaires. Breast cancer was defined as code C50 according to the International Classification of Diseases for Oncology, 3rd Edition or the International Classification of Diseases, 10th Revision. After adjusting for several potential confounders, relative risks for breast cancer were calculated in the individual studies according to the current or previous status of active and passive smoking using Cox regression, followed by a summary estimate of hazard ratios using random-effects meta-analyses.
RESULTS: Of the 60 441 participants who reported being premenopausal and 106 170 who reported being postmenopausal at baseline, 897 and 1168 developed breast cancer during follow-up, respectively. Compared with never smokers, current smokers had a higher risk of developing breast cancer before the age of 50 years. In addition, ever smokers who started smoking at 30 years of age or younger, or who started smoking before first childbirth, had a higher risk of developing breast cancer before the age of 50 years. No association between adulthood or childhood exposure to secondhand smoke and breast cancer was observed.
CONCLUSION: Smoking may increase the risk of premenopausal breast cancer, and smoking earlier in life might be especially harmful. The impact of secondhand smoke needs further investigation.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2024 |
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| Erschienen: |
2024 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:53 |
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| Enthalten in: |
International journal of epidemiology - 53(2024), 3 vom: 11. Apr. |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Wada, Keiko [VerfasserIn] |
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| Links: |
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| Themen: |
Breast cancer |
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| Anmerkungen: |
Date Completed 15.04.2024 Date Revised 15.04.2024 published: Print Citation Status MEDLINE |
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| doi: |
10.1093/ije/dyae047 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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NLM370939972 |
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| 100 | 1 | |a Wada, Keiko |e verfasserin |4 aut | |
| 245 | 1 | 0 | |a Active and passive smoking and breast cancer in Japan |b a pooled analysis of nine population-based cohort studies |
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| 500 | |a Date Revised 15.04.2024 | ||
| 500 | |a published: Print | ||
| 500 | |a Citation Status MEDLINE | ||
| 520 | |a © The Author(s) 2024; all rights reserved. Published by Oxford University Press on behalf of the International Epidemiological Association. | ||
| 520 | |a BACKGROUND: Epidemiological studies have shown inconsistent results regarding the link between smoking and breast cancer risk, despite the biological plausibility of a positive association | ||
| 520 | |a METHODS: Participants were 166 611 women from nine prospective cohort studies in Japan which launched in 1984-1994 and followed for 8-22 years. Information on smoking and secondhand smoke was obtained through self-administered baseline questionnaires. Breast cancer was defined as code C50 according to the International Classification of Diseases for Oncology, 3rd Edition or the International Classification of Diseases, 10th Revision. After adjusting for several potential confounders, relative risks for breast cancer were calculated in the individual studies according to the current or previous status of active and passive smoking using Cox regression, followed by a summary estimate of hazard ratios using random-effects meta-analyses | ||
| 520 | |a RESULTS: Of the 60 441 participants who reported being premenopausal and 106 170 who reported being postmenopausal at baseline, 897 and 1168 developed breast cancer during follow-up, respectively. Compared with never smokers, current smokers had a higher risk of developing breast cancer before the age of 50 years. In addition, ever smokers who started smoking at 30 years of age or younger, or who started smoking before first childbirth, had a higher risk of developing breast cancer before the age of 50 years. No association between adulthood or childhood exposure to secondhand smoke and breast cancer was observed | ||
| 520 | |a CONCLUSION: Smoking may increase the risk of premenopausal breast cancer, and smoking earlier in life might be especially harmful. The impact of secondhand smoke needs further investigation | ||
| 650 | 4 | |a Meta-Analysis | |
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Breast cancer | |
| 650 | 4 | |a early in life | |
| 650 | 4 | |a secondhand smoke | |
| 650 | 4 | |a smoking | |
| 650 | 7 | |a Tobacco Smoke Pollution |2 NLM | |
| 700 | 1 | |a Nagata, Chisato |e verfasserin |4 aut | |
| 700 | 1 | |a Utada, Mai |e verfasserin |4 aut | |
| 700 | 1 | |a Sakata, Ritsu |e verfasserin |4 aut | |
| 700 | 1 | |a Kimura, Takashi |e verfasserin |4 aut | |
| 700 | 1 | |a Tamakoshi, Akiko |e verfasserin |4 aut | |
| 700 | 1 | |a Sugawara, Yumi |e verfasserin |4 aut | |
| 700 | 1 | |a Tsuji, Ichiro |e verfasserin |4 aut | |
| 700 | 1 | |a Sato, Ren |e verfasserin |4 aut | |
| 700 | 1 | |a Sawada, Norie |e verfasserin |4 aut | |
| 700 | 1 | |a Tsugane, Shoichiro |e verfasserin |4 aut | |
| 700 | 1 | |a Oze, Isao |e verfasserin |4 aut | |
| 700 | 1 | |a Ito, Hidemi |e verfasserin |4 aut | |
| 700 | 1 | |a Kitamura, Tetsuhisa |e verfasserin |4 aut | |
| 700 | 1 | |a Koyanagi, Yuriko N |e verfasserin |4 aut | |
| 700 | 1 | |a Lin, Yingsong |e verfasserin |4 aut | |
| 700 | 1 | |a Matsuo, Keitaro |e verfasserin |4 aut | |
| 700 | 1 | |a Abe, Sarah K |e verfasserin |4 aut | |
| 700 | 1 | |a Inoue, Manami |e verfasserin |4 aut | |
| 700 | 0 | |a Research Group for the Development and Evaluation of Cancer Prevention Strategies in Japan |e verfasserin |4 aut | |
| 700 | 1 | |a Inoue, Manami |e investigator |4 oth | |
| 700 | 1 | |a Abe, Sarah Krull |e investigator |4 oth | |
| 700 | 1 | |a Sawada, Norie |e investigator |4 oth | |
| 700 | 1 | |a Tanaka, Shiori |e investigator |4 oth | |
| 700 | 1 | |a Kimura, Takashi |e investigator |4 oth | |
| 700 | 1 | |a Sugawara, Yumi |e investigator |4 oth | |
| 700 | 1 | |a Mizoue, Tetsuya |e investigator |4 oth | |
| 700 | 1 | |a Nomura, Shuhei |e investigator |4 oth | |
| 700 | 1 | |a Takimoto, Hidemi |e investigator |4 oth | |
| 700 | 1 | |a Ito, Hidemi |e investigator |4 oth | |
| 700 | 1 | |a Matsuo, Keitaro |e investigator |4 oth | |
| 700 | 1 | |a Lin, Yingsong |e investigator |4 oth | |
| 700 | 1 | |a Wada, Keiko |e investigator |4 oth | |
| 700 | 1 | |a Kitamura, Tetsuhisa |e investigator |4 oth | |
| 700 | 1 | |a Sakata, Ritsu |e investigator |4 oth | |
| 700 | 1 | |a Tanaka, Keitaro |e investigator |4 oth | |
| 700 | 1 | |a Charvat, Hadrien |e investigator |4 oth | |
| 700 | 1 | |a Hidaka, Akihisa |e investigator |4 oth | |
| 700 | 1 | |a Hirabayashi, Mayo |e investigator |4 oth | |
| 700 | 1 | |a Iwasaki, Motoki |e investigator |4 oth | |
| 700 | 1 | |a Kitamura, Yuri |e investigator |4 oth | |
| 700 | 1 | |a Mori, Nagisa |e investigator |4 oth | |
| 700 | 1 | |a Muto, Michihiro |e investigator |4 oth | |
| 700 | 1 | |a Nagata, Chisato |e investigator |4 oth | |
| 700 | 1 | |a Naito, Mariko |e investigator |4 oth | |
| 700 | 1 | |a Nakayama, Tomio |e investigator |4 oth | |
| 700 | 1 | |a Nishino, Yoshikazu |e investigator |4 oth | |
| 700 | 1 | |a Sadakane, Atsuko |e investigator |4 oth | |
| 700 | 1 | |a Saito, Eiko |e investigator |4 oth | |
| 700 | 1 | |a Sasazuki, Shizuka |e investigator |4 oth | |
| 700 | 1 | |a Shimazu, Taichi |e investigator |4 oth | |
| 700 | 1 | |a Shimizu, Hiroyuki |e investigator |4 oth | |
| 700 | 1 | |a Sugiyama, Kemmyo |e investigator |4 oth | |
| 700 | 1 | |a Suzuki, Hidekazu |e investigator |4 oth | |
| 700 | 1 | |a Tamakoshi, Akiko |e investigator |4 oth | |
| 700 | 1 | |a Tsubono, Yoshitaka |e investigator |4 oth | |
| 700 | 1 | |a Tsuji, Ichiro |e investigator |4 oth | |
| 700 | 1 | |a Tsugane, Shoichiro |e investigator |4 oth | |
| 700 | 1 | |a Utada, Mai |e investigator |4 oth | |
| 700 | 1 | |a Wakai, Kenji |e investigator |4 oth | |
| 700 | 1 | |a Yamagiwa, Yoko |e investigator |4 oth | |
| 700 | 1 | |a Yamaji, Taiki |e investigator |4 oth | |
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