Smoking and the molecular epidemiology of lung cancer

Our plain-English summary of Smoking and the molecular epidemiology of lung cancer, by D.C. Christiani (Clinics in Chest Medicine, 2000).

The study

• Author: D.C. Christiani
• Journal: Clinics in Chest Medicine
• Published: 2000;21(1):87-93, viii
• Type of article: Review
• Cited by: 19 articles, as counted by NIH iCite
• Read it: PubMed · Publisher

Abstract

Lung carcinogenesis in humans requires exposure to environmental agents, including the inhalation of tobacco smoke, radioactive compounds, asbestos, heavy metals, and petrochemicals. Tobacco smoking is the risk factor with the highest attributable lung cancer risk worldwide. This article discusses occupational carcinogen exposure and exposure from tobacco use, and the lung-cancer risk associated with these types of exposure.

In plain English

This article was a single-author review of published research on tobacco smoking and lung cancer. It focused on studies that use biological markers of exposure and genetic susceptibility, and it presented no new data. The author described how chemicals in tobacco smoke are thought to damage DNA and summarized earlier family studies. One cited study reported a relative risk of 2.4 for lung cancer among relatives of lung cancer cases compared with relatives of controls. Citing other work, the review stated that variants of the CYP1A1 gene may raise lung cancer risk at least twofold after adjusting for smoking. It also stated that people with both copies of the GSTM1 gene deleted are at 1.4 to 1.6-fold increased risk, though links between such genes and lung cancer had been found with great inconsistency. On asbestos, the review stated that some occupational lung carcinogens interact with smoking to multiply lung cancer risk, with asbestos the best-described example. Radon appeared to act more than additively but less than multiplicatively. The author concluded that existing knowledge could prevent 85% to 90% of lung cancer worldwide if societies act on it.

We wrote this plain-English summary from the full article with the help of AI, and a second AI model checked each sentence against the article. It is not the authors' wording; the abstract and the article are their own account.

What the study did and found

• Design: Narrative review of published studies (no original data)
• Who was studied: No study population of its own; the article discussed previously published human, genetic and laboratory studies of smoking and lung cancer
• Exposure: Tobacco smoke and its carcinogens (polyaromatic hydrocarbons, nitrosamines), plus known occupational lung carcinogens including asbestos, arsenic, coal gas, chromates, nickel and silica; no asbestos fiber types were specified
• Main results:
  • Citing other work, the review stated that some occupational carcinogens interact with smoking to increase lung cancer risk multiplicatively, with asbestos the best-described example
  • Multiplicative interaction means the combined risk equals the product of the individual risks of the occupational exposure and tobacco use
  • The review stated that the available evidence on radon suggested radon and smoking act more than additively but less than multiplicatively
  • A cited study (Ooi et al.) of relatives of 336 deceased lung cancer cases in Louisiana reported a relative risk of 2.4 for lung cancer among case relatives compared with control relatives, after adjusting for environmental and occupational exposures
  • The review stated that CYP1A1 gene polymorphism may increase lung cancer risk at least twofold after adjusting for smoking habits, and that individuals homozygous for GSTM1 deletion are at 1.4 to 1.6-fold increased risk
  • The review noted that associations between metabolic gene polymorphisms and lung cancer had been found with great inconsistency
• The authors' conclusion: The author concluded that epidemiologic research has provided enough information to prevent 85% to 90% of lung cancer in the world if societies are prepared to act on it, and that tobacco-induced lung cancer is a model for studying gene-environment interactions

Topics

The National Library of Medicine indexes this study under subjects our site covers: Lung cancer.

Medical terms in this study, explained in our Lexicon: Epidemiology, Lung Cancer, Carcinogenesis.

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