Chest
Volume 123, Issue 1, Supplement, January 2003, Pages 21S-49S
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Epidemiology of Lung Cancer*

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In the United States, lung cancer remains the leading cause of cancer death in both men and women even though an extensive list of risk factors has been well-characterized. Far and away the most important cause of lung cancer is exposure to tobacco smoke through active or passive smoking. The reductions in smoking prevalence in men that occurred in the late 1960s through the 1980s will continue to drive the lung cancer mortality rates downward in men during the first portion of this century. This favorable trend will not persist unless further reductions in smoking prevalence are achieved.

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Temporal Trends

Because of the high case-fatality rate of lung cancer, the incidence and mortality rates are nearly equivalent, and, consequently, routinely collected vital statistics provide a long record of the occurrence of lung cancer. We are presently amid an epidemic of lung cancer that dates to the mid-20th century (Fig 1).192021 Lung cancer was rare until the disease began a sharp rise around 1930 that culminated by mid-century with lung cancer becoming the leading cause of cancer death among men.22

Overview

Although the causes of lung cancer are almost exclusively environmental, it is likely that there is substantial individual variation in the susceptibility to respiratory carcinogens. The risk of the disease can be conceptualized as reflecting the joint consequences of the interrelationship between (1) exposure to etiologic (or protective) agents and (2) the individual susceptibility to these agents. The term environment in its broadest sense may influence the risk of disease through direct

Overview

A single etiologic agent, cigarette smoking, is by far the leading cause of lung cancer, accounting for approximately 90% of lung cancer cases in the United States and other countries where cigarette smoking is common.45 Compared to never-smokers, smokers have about a 20-fold increase in lung cancer risk at present. Few exposures to environmental agents convey such risks for any disease. In general, trends of lung cancer occurrence closely reflect patterns of smoking, but rates of occurrence

Overview

Genetic susceptibility to lung cancer has long been postulated. Environmental agents, even cigarette smoking, cause lung cancer in only a minority of exposed persons, leading to the hypothesis that susceptibility is inherently determined. Epidemiologic studies showing that a family history of lung cancer predicts increased risk further support a genetic basis for lung cancer susceptibility. This long-postulated hypothesis is now being actively addressed using the approach of molecular

Conclusions

The path to preventing lung cancer is charted by the identification of numerous exposures that are causally associated with lung cancer. If steps can be taken to reduce or eliminate the population's exposure to these agents, this would be expected to reduce the population's risk of lung cancer. Preventive strategies can be pursued in the public policy arena or in public health interventions that are directed at individual behavior. Cigarette smoking provides a useful example to illustrate the

ACKNOWLEDGMENT

The authors thank Charlotte Gerczak for her assistance in preparing this manuscript.

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    Dr. Alberg is a recipient of a K07 Award (No. CA73790) from the National Cancer Institute.

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