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Lung Cancer. 2015 May;88(2):124-30. doi: 10.1016/j.lungcan.2015.02.015. Epub 2015 Feb 26.

Fruit and vegetable consumption and risk of lung cancer: a dose-response meta-analysis of prospective cohort studies.

Author information

1
Department of Thoracic Surgery, The Affiliated Hospital of Medical College of Qingdao University, Jiangsu Road, No. 19, Qingdao 266001, Shandong, PR China.
2
Department of Thoracic Surgery, The Affiliated Hospital of Medical College of Qingdao University, Jiangsu Road, No. 19, Qingdao 266001, Shandong, PR China. Electronic address: qdwangmz1966@163.com.

Abstract

OBJECTIVES:

A meta-analysis was conducted to summarize evidence from prospective cohort studies about the association of fruit and vegetable consumption with the risk of lung cancer.

MATERIALS AND METHODS:

Pertinent studies were identified by a search of Embase and PubMed databases to October 2014. A random-effects model was used to combine study-specific relative risks and 95% confidence interval [RR (95% CI)]. Dose-response relationship was assessed by restricted cubic spline.

RESULTS:

The RR (95% CI) of lung cancer for highest versus lowest category of fruit and vegetable (FV) consumption was 0.87 (0.79-0.95) (8 studies including 12,942 cases among 1,571,494 subjects), and the effect was 0.84 (0.79-0.90) for fruit (16 studies including 15,421 cases among 1,791,469 subjects) and 0.90 (0.84-0.96) for vegetable (19 studies including 16,422 cases among 1,877,375 subjects). The above-mentioned associations did not differed significantly in subgroup analysis by country, age, number of covariates adjusted, quality score, sex, smoking status and histological subtypes; however, studies with follow-up duration of ≥10 years and with FV assessed by interview showed a stronger association than those of <10 years and by self-administrated food frequency questionnaires, respectively. The risk of lung cancer decreased by 3% (P=0.07), 5% (P<0.01) and 3% (P=0.09) for every 1 serving/day increment in FV, fruit and vegetable consumption, respectively. There was a threshold around 2 servings/day of fruit and 2 servings/day of vegetable, respectively, after which the risk of lung cancer did not reduce further.

CONCLUSIONS:

Fruit and vegetable consumption are inversely associated with risk of lung cancer.

KEYWORDS:

Fruit; Lung cancer; Meta-analysis; Prospective cohort studies; Vegetable

PMID:
25747805
DOI:
10.1016/j.lungcan.2015.02.015
[Indexed for MEDLINE]

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