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Cancer Epidemiol Biomarkers Prev. 2019 Aug;28(8):1370-1378. doi: 10.1158/1055-9965.EPI-18-1327. Epub 2019 May 21.

Smoking and Pancreatic Cancer Incidence: A Pooled Analysis of 10 Population-Based Cohort Studies in Japan.

Author information

1
Division of Cancer Information and Control, Department of Preventive Medicine, Aichi Cancer Research Institute, Nagoya, Japan.
2
Division of Cancer Information and Control, Department of Preventive Medicine, Aichi Cancer Research Institute, Nagoya, Japan. hidemi@aichi-cc.jp.
3
Department of Epidemiology, Nagoya University Graduate School of Medicine, Nagoya, Japan.
4
Division of Cancer Epidemiology and Prevention, Department of Preventive Medicine, Aichi Cancer Center Research Institute, Nagoya, Japan.
5
Division of Epidemiology, Department of Health Informatics and Public Health, Tohoku University School of Public Health, Graduate School of Medicine, Sendai, Japan.
6
Epidemiology and Prevention Group, Center for Public Health Sciences, National Cancer Center, Tokyo, Japan.
7
Department of Epidemiology and Preventive Medicine, Gifu University Graduate School of Medicine, Gifu, Japan.
8
Department of Public Health, Hokkaido University Faculty of Medicine, Sapporo, Japan.
9
Department of Public Health, Aichi Medical University School of Medicine, Aichi, Japan.
10
Department of Social and Environmental Medicine, Osaka University Graduate School of Medicine, Osaka, Japan.
11
Department of Epidemiology, Radiation Effects Research Foundation, Hiroshima, Japan.
12
Department of Oral Epidemiology, Hiroshima University Graduate School of Biomedical and Health Sciences, Hiroshima, Japan.
13
Department of Preventive Medicine, Faculty of Medicine, Saga University, Saga, Japan.

Abstract

BACKGROUND:

Detailed prospective evaluation of cigarette smoking associated with pancreatic cancer risk in large Asian populations is limited. The aim of this study was to examine this association in a Japanese population, with a particular focus on evaluating sex differences.

METHODS:

We performed a pooled analysis of 10 population-based cohort studies. We calculated study-specific HRs and 95% confidence intervals (CI) using Cox proportional hazards regression, and then estimated summary HRs by pooling these estimates with a random effects model.

RESULTS:

During 4,695,593 person-years of follow-up in 354,154 participants, 1,779 incident pancreatic cancer cases were identified. We observed an increased pancreatic cancer risk for current smoking compared with never smoking in both males [HR (95% CI), 1.59 (1.32-1.91)] and females [HR (95% CI), 1.81 (1.43-2.30)]. Significant risk elevations for former smoking and small cumulative dose of ≤20 pack-years (PY) were observed only among females, regardless of environmental tobacco smoke exposure. Trend analysis indicated significant 6% and nonsignificant 6% increases in pancreatic cancer risk for every 10 PYs in males and females, respectively. Risk became comparable with never smokers after 5 years of smoking cessation in males. In females, however, we observed no risk attenuation by smoking cessation.

CONCLUSIONS:

This study supports the well-known association between smoking and pancreatic cancer and indicates potential sex differences in a Japanese population. Quitting smoking would be beneficial for pancreatic cancer prevention, especially in males.

IMPACT:

Pancreatic cancer risk is increased with cumulative smoking exposure and decreased with smoking cessation, with potential sex differences.

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