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- Title
Fruits, vegetables and lung cancer: A pooled analysis of cohort studies.
- Authors
Stephanie A. Smith-Warner; Donna Spiegelman; Shiaw-Shyuan Yaun; Demetrius Albanes; W. Lawrence Beeson; Piet A. van den Brandt; Diane Feskanich; Aaron R. Folsom; Gary E. Fraser; Jo L. Freudenheim; Edward Giovannucci; R. Alexandra Goldbohm; Saxon Graham; Lawrence H. Kushi; Anthony B. Miller; Pirjo Pietinen; Thomas E. Rohan
- Abstract
Inverse associations between fruit and vegetable consumption and lung cancer risk have been consistently reported. However, identifying the specific fruits and vegetables associated with lung cancer is difficult because the food groups and foods evaluated have varied across studies. We analyzed fruit and vegetable groups using standardized exposure and covariate definitions in 8 prospective studies. We combined study-specific relative risks (RRs) using a random effects model. In the pooled database, 3,206 incident lung cancer cases occurred among 430,281 women and men followed for up to 616 years across studies. Controlling for smoking habits and other lung cancer risk factors, a 1623% reduction in lung cancer risk was observed for quintiles 2 through 5 vs. the lowest quintile of consumption for total fruits (RR = 0.77; 95% CI = 0.670.87 for quintile 5; p-value, test for trend < 0.001) and for total fruits and vegetables (RR = 0.79; 95% CI = 0.690.90; p-value, test for trend = 0.001). For the same comparison, the association was weaker for total vegetable consumption (RR = 0.88; 95% CI = 0.781.00; p-value, test for trend = 0.12). Associations were similar between never, past, and current smokers. These results suggest that elevated fruit and vegetable consumption is associated with a modest reduction in lung cancer risk, which is mostly attributable to fruit, not vegetable, intake. However, we cannot rule out the possibility that our results are due to residual confounding by smoking. The primary focus for reducing lung cancer incidence should continue to be smoking prevention and cessation. © 2003 Wiley-Liss, Inc.
- Subjects
FRUIT; VEGETABLES; LUNG cancer
- Publication
International Journal of Cancer, 2003, Vol 107, Issue 6, p1001
- ISSN
0020-7136
- Publication type
Article
- DOI
10.1002/ijc.11490