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      Higher Lung Cancer Incidence in Young Women Than Young Men in the United States

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          Abstract

          Previous studies showed a higher incidence of lung cancer among young women than among young men in the United States. Whether this pattern has continued in contemporary birth cohorts and, if so, whether it can be fully explained by sex differences in smoking behaviors are unknown.

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          Most cited references20

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          Lung cancer incidence in never smokers.

          Lung cancer is a leading cause of cancer death worldwide. Although smoking remains the predominant cause of lung cancer, lung cancer in never smokers is an increasingly prominent public health issue. However, data on this topic, particularly lung cancer incidence rates in never smokers, are limited. We reviewed the existing literature on lung cancer incidence and mortality rates among never smokers and present new data regarding rates in never smokers from the following large, prospective cohorts: Nurses' Health Study; Health Professionals Follow-Up Study; California Teachers Study; Multiethnic Cohort Study; Swedish Lung Cancer Register in the Uppsala/Orebro region; and First National Health and Nutrition Examination Survey Epidemiologic Follow-Up Study. Truncated age-adjusted incidence rates of lung cancer among never smokers age 40 to 79 years in these six cohorts ranged from 14.4 to 20.8 per 100,000 person-years in women and 4.8 to 13.7 per 100,000 person-years in men, supporting earlier observations that women are more likely than men to have non-smoking-associated lung cancer. The distinct biology of lung cancer in never smokers is apparent in differential responses to epidermal growth factor receptor inhibitors and an increased prevalence of adenocarcinoma histology in never smokers. Lung cancer in never smokers is an important public health issue, and further exploration of its incidence patterns, etiology, and biology is needed.
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            Differences in lung cancer risk between men and women: examination of the evidence.

            Lung cancer incidence is gradually leveling off in U.S. men but is continuing to rise in U.S. women. This increase in U.S. women exceeds that expected from a slower decline of smoking among women. Recent epidemiologic and biochemical studies suggest gender differences in susceptibility to tobacco carcinogens. We conducted an up-to-date, more in-depth evaluation of our earlier observation of a potential gender difference in relative risk (RR) of lung cancer due to smoking. We added information from several additional case and control subjects and included more precise histologic classification of the cancer type, accurate quantitation of smoke exposure, and adjustments for body size. The present investigation was a part of an ongoing hospital-based, case-control study by the American Health Foundation. It included data from 1889 case subjects (1108 males and 781 females) with lung cancer of squamous/epidermoid, small-cell/oat cell, large-cell, and adenocarcinoma types and 2070 control subjects (1122 males and 948 females) with diseases unrelated to smoking. The case and control subjects were admitted to participating hospitals from 1981 to 1994 and were pair-matched by age, sex, hospital, and the time of hospital admission. Ex-smokers and non-Caucasians were excluded from analyses to avoid confounding. The RRs and 95% confidence intervals were estimated from adjusted odds ratios (ORs) by use of unconditional multiple logistic regression analysis, and statistical significance was determined by two-sided tests. The ORs for major histologic types were estimated at increasing levels of exposure to cigarette smoke. Our results indicated that women were more likely to be never-smokers than men, particularly those with the squamous/epidermoid-type cancer (8.3% for women versus 2.9% for men 55 years old or older). Men started smoking earlier, reported inhaling more deeply, and smoked more cigarettes per day than women. In contrast, dose-response ORs over cumulative exposure to cigarette smoking were 1.2-fold to 1.7-fold higher in women than in men for the three major histologic types; these differences were more pronounced for small-cell/oat cell carcinomas and adenocarcinomas than for squamous/epidermoid carcinomas. Adjustments for weight, height, or body mass index did not alter the ORs. These results confirm our earlier finding that the ORs for major lung cancer types are consistently higher for women than for men at every level of exposure to cigarette smoke. Furthermore, this gender difference cannot be explained by differences in base-line exposure, smoking history, or body size, but it is likely due to the higher susceptibility to tobacco carcinogens in women.
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              US lung cancer trends by histologic type.

              Lung cancer incidence rates overall are declining in the United States. This study investigated the trends by histologic type and demographic characteristics.
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                Author and article information

                Journal
                New England Journal of Medicine
                N Engl J Med
                New England Journal of Medicine (NEJM/MMS)
                0028-4793
                1533-4406
                May 24 2018
                May 24 2018
                : 378
                : 21
                : 1999-2009
                Affiliations
                [1 ]From Surveillance and Health Services Research, American Cancer Society, Atlanta (A.J., K.D.M., J.M., R.L.S., S.A.F., F.I., M.J.T.); and the Division of Cancer Epidemiology and Genetics, National Cancer Institute, Rockville, MD (S.S.D.).
                Article
                10.1056/NEJMoa1715907
                7717174
                29791813
                699bfcb7-5ddb-4c47-b055-4baf675605a0
                © 2018
                History

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