Cruciferous vegetable intake is inversely associated with lung cancer risk among smokers: a case-control study.
BACKGROUND
Inverse associations between cruciferous vegetable intake and lung cancer risk have been consistently reported. However, associations within smoking status subgroups have not been consistently addressed.


METHODS
We conducted a hospital-based case-control study with lung cancer cases and controls matched on smoking status, and further adjusted for smoking status, duration, and intensity in the multivariate models. A total of 948 cases and 1743 controls were included in the analysis.


RESULTS
Inverse linear trends were observed between intake of fruits, total vegetables, and cruciferous vegetables and risk of lung cancer (ORs ranged from 0.53-0.70, with P for trend < 0.05). Interestingly, significant associations were observed for intake of fruits and total vegetables with lung cancer among never smokers. Conversely, significant inverse associations with cruciferous vegetable intake were observed primarily among smokers, in particular former smokers, although significant interactions were not detected between smoking and intake of any food group. Of four lung cancer histological subtypes, significant inverse associations were observed primarily among patients with squamous or small cell carcinoma - the two subtypes more strongly associated with heavy smoking.


CONCLUSIONS
Our findings are consistent with the smoking-related carcinogen-modulating effect of isothiocyanates, a group of phytochemicals uniquely present in cruciferous vegetables. Our data support consumption of a diet rich in cruciferous vegetables may reduce the risk of lung cancer among smokers.
Tang
Li
L
Department of Cancer Prevention and Control, Roswell Park Cancer Institute, Elm and Carlton Streets, Buffalo, NY 14263, USA. Li.Tang@RoswellPark.org
Zirpoli
Gary R
GR
Jayaprakash
Vijayvel
V
Reid
Mary E
ME
McCann
Susan E
SE
Nwogu
Chukwumere E
CE
Zhang
Yuesheng
Y
Ambrosone
Christine B
CB
Moysich
Kirsten B
KB
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016588:Anticarcinogenic Agents / Q000008:administration & dosage*; D019607:Brassicaceae; D016022:Case-Control Studies; D016009:Chi-Square Distribution; D005247:Feeding Behavior; D006801:Humans; D017879:Isothiocyanates / Q000008:administration & dosage*; D016015:Logistic Models; D008175:Lung Neoplasms / Q000209:etiology* / Q000517:prevention & control*; D008875:Middle Aged; D016017:Odds Ratio; D012042:Registries; D018570:Risk Assessment; D012307:Risk Factors; D012907:Smoking / Q000009:adverse effects*; D016540:Smoking Cessation; D000074606:Smoking Prevention; D014675:Vegetables
D016588:Anticarcinogenic Agents; D017879:Isothiocyanates