Characteristics of never smoker lung cancer including environmental and occupational risk factors.
BACKGROUND
Clinical characteristics and risk factors of nonsmoker patients with lung cancer are still debated.


OBJECTIVE
The aim of this work is to describe the characteristics of never smoker patients with lung cancer, focusing on occupational and environmental exposures, Data collected were: age, gender, histological types, methods of diagnosis, TNM staging, smoking, and occupational data. Statistical analysis included descriptive analyses, Pearson's chi-square or nonparametric tests, and logistic regressions.


RESULTS
All lung cancers diagnosed between January 1, 1997 and December 31, 2006, representing 1493 cases were included. Lung adenocarcinoma (ADC) [Odds Ratio (OR)=2.5 (1.5-4.3), p<0.0001] as well as clinical stage I cases at diagnosis [OR=2.4 (1.3-4.3)] were most frequent in nonsmokers relative to ever smokers. Comparison of clinical features among male and female nonsmoker patients did not reveal significant differences. Conversely, strong differences appeared when comparing environmental tobacco smoke (ETS) and occupational exposures in nonsmoker women vs men: ETS exposure (78.6% nonsmoker women vs 21.4% nonsmoker men, p<0.0001), occupational exposure (9.4% vs 48.6%, p<0.0005). Noteworthy, a sizeable number of nonsmoker male (40.0%), and nonsmoker female (31.2%) patients had no known exposure to major lung carcinogens.


CONCLUSIONS
Main risk factors (ETS and occupational exposure) may only explain some cases.
Clément-Duchêne
Christelle
C
Respiratory Diseases Department, University Hospital, Vandoeuvre-Les-Nancy, France. christelle.clementduchene@gmail.com
Vignaud
Jean-Michel
JM
Stoufflet
Audrey
A
Bertrand
Odile
O
Gislard
Antoine
A
Thiberville
Luc
L
Grosdidier
Gilles
G
Martinet
Yves
Y
Benichou
Jacques
J
Hainaut
Pierre
P
Paris
Christophe
C
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D004781:Environmental Exposure / Q000009:adverse effects*; D005260:Female; D006801:Humans; D008175:Lung Neoplasms / Q000209:etiology* / Q000473:pathology; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D016273:Occupational Exposure / Q000009:adverse effects*; D012307:Risk Factors; D012907:Smoking / Q000009:adverse effects; D014028:Tobacco Smoke Pollution / Q000009:adverse effects
D014028:Tobacco Smoke Pollution