TY - JOUR
T1 - Smoking cessation and subsequent risk of cancer
T2 - A pooled analysis of eight population-based cohort studies in Japan
AU - for the Research Group for the Development and Evaluation of Cancer Prevention Strategies in Japan
AU - Saito, Eiko
AU - Inoue, Manami
AU - Tsugane, Shoichiro
AU - Ito, Hidemi
AU - Matsuo, Keitaro
AU - Wakai, Kenji
AU - Wada, Keiko
AU - Nagata, Chisato
AU - Tamakoshi, Akiko
AU - Sugawara, Yumi
AU - Tsuji, Ichiro
AU - Mizoue, Tetsuya
AU - Tanaka, Keitaro
AU - Sasazuki, Shizuka
N1 - Funding Information:
This work was supported in part by the National Cancer Center Research and Development Fund ( 24-A-3 ).
Publisher Copyright:
© 2017 Elsevier Ltd
PY - 2017/12
Y1 - 2017/12
N2 - Background Although East Asia is one of the largest tobacco-epidemic regions in the world, only a few prospective studies from Asia have investigated the impact of smoking and cessation of smoking on cancer. We aimed to assess the effect of cessation of smoking on the risk of cancer using eight population-based cohort studies in Japan. Methods We analyzed pooled data from eight population-based prospective cohort studies in Japan with more than 320,000 participants to assess the effect of smoking cessation on the risk of total cancers and smoking-related cancers. Results After adjustment for potential confounders, cancer risks in men with >21 years of smoking cessation before baseline were found to decrease to the same level as never smokers for total cancer (never smokers: reference; former smokers with ≥21 years since smoking cessation: HR, 1.01; 95%CI: 0.91, 1.11). Even men who are heavy smokers (more than 20 pack-years) reported a reduced risk of total cancer (never smokers: reference; former smokers with ≥21 years since smoking cessation: HR, 1.06; 95%CI: 0.92, 1.23). In women, the risk of total cancer did not differ from that of never smokers after 11 years of smoking cessation before baseline (never smokers: reference; former smokers with ≥11 years since smoking cessation: HR, 0.96; 95%CI: 0.74, 1.23). Conclusions Our study suggests that longer duration of smoking cessation may attenuate the risk of cancer in both men and women, and that even heavy smokers (more than 20 pack-years) were found to benefit from quitting smoking.
AB - Background Although East Asia is one of the largest tobacco-epidemic regions in the world, only a few prospective studies from Asia have investigated the impact of smoking and cessation of smoking on cancer. We aimed to assess the effect of cessation of smoking on the risk of cancer using eight population-based cohort studies in Japan. Methods We analyzed pooled data from eight population-based prospective cohort studies in Japan with more than 320,000 participants to assess the effect of smoking cessation on the risk of total cancers and smoking-related cancers. Results After adjustment for potential confounders, cancer risks in men with >21 years of smoking cessation before baseline were found to decrease to the same level as never smokers for total cancer (never smokers: reference; former smokers with ≥21 years since smoking cessation: HR, 1.01; 95%CI: 0.91, 1.11). Even men who are heavy smokers (more than 20 pack-years) reported a reduced risk of total cancer (never smokers: reference; former smokers with ≥21 years since smoking cessation: HR, 1.06; 95%CI: 0.92, 1.23). In women, the risk of total cancer did not differ from that of never smokers after 11 years of smoking cessation before baseline (never smokers: reference; former smokers with ≥11 years since smoking cessation: HR, 0.96; 95%CI: 0.74, 1.23). Conclusions Our study suggests that longer duration of smoking cessation may attenuate the risk of cancer in both men and women, and that even heavy smokers (more than 20 pack-years) were found to benefit from quitting smoking.
KW - Cohort study
KW - Japanese
KW - Pooled analysis
KW - Smoking cessation
KW - Tobacco-related cancer
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U2 - 10.1016/j.canep.2017.10.013
DO - 10.1016/j.canep.2017.10.013
M3 - Article
C2 - 29102692
AN - SCOPUS:85032660246
VL - 51
SP - 98
EP - 108
JO - Cancer Epidemiology
JF - Cancer Epidemiology
SN - 1877-7821
ER -