Cancer in twin pairs discordant for smoking: The Nordic Twin Study of Cancer

被引:3
作者
Korhonen, Tellervo [1 ]
Hjelmborg, Jacob [2 ,3 ]
Harris, Jennifer R. [4 ]
Clemmensen, Signe [2 ,3 ]
Adami, Hans-Olov [5 ,6 ]
Kaprio, Jaakko [1 ]
机构
[1] Univ Helsinki, Inst Mol Med Finland, POB 20, FIN-00014 Helsinki, Finland
[2] Univ Southern Denmark, Dept Epidemiol Biostat & Biodemog, Odense, Denmark
[3] Univ Southern Denmark, Danish Twin Registry, Odense, Denmark
[4] Norwegian Inst Publ Hlth, Ctr Fertil & Hlth, Oslo, Norway
[5] Karolinska Inst, Dept Med Epidemiol & Biostat, Stockholm, Sweden
[6] Univ Oslo, Inst Hlth, Clin Effectiveness Grp, Oslo, Norway
关键词
cancer; case-co-twin design; smoking; twins; LUNG-CANCER; OBSERVATIONAL RESEARCH; SEX-DIFFERENCES; HERITABILITY; SUSCEPTIBILITY; MORTALITY; HEALTH; EPIDEMIOLOGY; PATTERNS; BEHAVIOR;
D O I
10.1002/ijc.33963
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
The discordant twin pair study design is powerful to control for familial confounding. We employed this approach to investigate the associations of smoking with several cancers. The NorTwinCan study combines data from the Danish, Finnish, Norwegian and Swedish twin and cancer registries. Follow-up started when smoking status was determined and ended at cancer diagnosis confirmed by information in the cancer registry, death or end of follow-up. We classified the participants as never (n = 59 093), former (n = 21 168) or current (n = 47 314) smokers. We pooled data from twin pairs where one co-twin was diagnosed with any of the following tobacco-related cancers: esophagus, kidney, larynx, liver, oral cavity, pancreas, pharynx or urinary bladder, while their co-twin had none of those. Lung cancer was included in further analysis. We used Cox regression allowing for pair-specific baseline functions to estimate hazard ratios (HRs) with 95% confidence intervals (CIs). For tobacco-related cancer sites, we recorded 7379 cases during median 27 years of follow-up. The analyses based on individual twins showed that former (HR 1.31, 95% CI: 1.17-1.48) and current (HR 2.14 [1.95-2.34]) smokers are at increased risk to develop one of cancers listed above, compared to never smokers. Among 109 monozygotic twin pairs discordant for cancer and smoking, the HR was 1.85 (95% CI: 1.15-2.98) among current smokers and 1.69 (1.00-2.87) among former smokers when compared to their never smoking co-twin. Thus, associations of smoking with several cancers were replicated for discordant identical twin pairs. Analyses based on genetically informative data provide evidence consistent with smoking causing multiple cancers.
引用
收藏
页码:33 / 43
页数:11
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