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Int J Cancer. 2016 Nov 15;139(10):2178-92. doi: 10.1002/ijc.30281.

Physical activity and sedentary behavior in relation to lung cancer incidence and mortality in older women: The Women's Health Initiative.

Author information

1
Division of Oncology, Department of Medicine, Stanford University School of Medicine, Stanford, CA.
2
Quantitative Sciences Unit, Stanford University School of Medicine, Palo Alto, CA.
3
Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, Torrance, CA.
4
Cancer Prevention Institute of California, Fremont, CA.
5
Department of Family Medicine, Memorial Hospital of Rhode Island, and Department of Epidemiology, School of Public Health at Brown University, Providence, RI.
6
Department of Preventive Medicine, University of Tennessee Health Science Center, Memphis, TN.
7
Department of Public Health Sciences, University of California Davis, Davis, CA.
8
Department of Social and Preventive Medicine, University at Buffalo, Buffalo, NY.
9
Department of Internal Medicine, University of Tennessee Health Science Center, Memphis, TN.
10
Department of Medicine, Stanford Prevention Research Center, Stanford University School of Medicine, Stanford, CA. stefanick@stanford.edu.

Abstract

Physical activity has been associated with lower lung cancer incidence and mortality in several populations. We investigated these relationships in the Women's Health Initiative Observational Study (WHI-OS) and Clinical Trial (WHI-CT) prospective cohort of postmenopausal women. The WHI study enrolled 161,808 women aged 50-79 years between 1993 and 1998 at 40 U.S. clinical centers; 129,401 were eligible for these analyses. Cox proportional hazards models were used to assess the association of baseline physical activity levels [metabolic equivalent (MET)-min/week: none <100 (reference), low 100 to <500, medium 500 to <1,200, high 1,200+] and sedentary behavior with total lung cancer incidence and mortality. Over 11.8 mean follow-up years, 2,148 incident lung cancer cases and 1,365 lung cancer deaths were identified. Compared with no activity, higher physical activity levels at study entry were associated with lower lung cancer incidence [p = 0.009; hazard ratios (95% confidence intervals) for each physical activity category: low, HR: 0.86 (0.76-0.96); medium, HR: 0.82 (0.73-0.93); and high, HR: 0.90 (0.79-1.03)], and mortality [p < 0.0001; low, HR: 0.80 (0.69-0.92); medium, HR: 0.68 (0.59-0.80); and high, HR: 0.78 (0.66-0.93)]. Body mass index (BMI) modified the association with lung cancer incidence (p = 0.01), with a stronger association in women with BMI < 30 kg/m(2) . Significant associations with sedentary behavior were not observed. In analyses by lung cancer subtype, higher total physical activity levels were associated with lower lung cancer mortality for both overall NSCLC and adenocarcinoma. In conclusion, physical activity may be protective for lung cancer incidence and mortality in postmenopausal women, particularly in non-obese women.

KEYWORDS:

Women's Health Initiative; exercise; incidence; lung cancer; mortality; physical activity; sedentary behavior

PMID:
27439221
PMCID:
PMC5501309
DOI:
10.1002/ijc.30281
[Indexed for MEDLINE]
Free PMC Article

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