Smoking and colorectal cancer in a non-Western population: a prospective cohort study in Japan.

Abstract:

BACKGROUND:The risk of colorectal cancer in relation to smoking habits has been examined mostly in Caucasians, and evidence for other ethnic groups is still scarce. METHODS:Our data came from the Japan Collaborative Cohort (JACC) Study. From 1988 through 1990, 25,260 men and 34,619 women aged 40-79 years completed a questionnaire on cigarette smoking and other lifestyle factors. Hazard ratios (HR) were estimated by fitting proportional hazards models. RESULTS:During the mean follow-up of 7.6 years through December 1997, we documented 408 incident colon cancers and 204 rectal cancers. We found a non-significant increase in colon cancer risk in male current smokers compared with never smokers. The multivariate-adjusted hazard ratios were 1.07 (95% confidence interval [CI]: 0.72-1.59) for ex-smokers and 1.23 (95% CI: 0.85-1.78) for current smokers. We however failed to observe a clear dose-response relationship between smoking intensity or duration and colon cancer risk. The adjusted hazard ratio was 1.07 (95% CI: 0.71-1.61) even for 40+ years of smoking. Almost no increase in colon cancer risk was detected for female smokers, and male smokers were not at an enhanced risk of rectal cancer. CONCLUSIONS:Cigarette smoking was not a strong risk factor for colorectal cancer even after a long-term exposure, although a weak association remains open to discussion.

journal_name

J Epidemiol

journal_title

Journal of epidemiology

authors

Wakai K,Hayakawa N,Kojima M,Tamakoshi K,Watanabe Y,Suzuki K,Hashimoto S,Tokudome S,Toyoshima H,Ito Y,Tamakoshi A,JACC Study Group.

doi

10.2188/jea.13.323

subject

Has Abstract

pub_date

2003-11-01 00:00:00

pages

323-32

issue

6

eissn

0917-5040

issn

1349-9092

journal_volume

13

pub_type

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