Diesel Engine Exhaust Exposure, Smoking, and Lung Cancer Subtype Risks: A Pooled Exposure-response Analysis of 14 Case-control Studies

Calvin Ge*, Susan Peters, Ann Olsson, Lützen Portengen, Joachim Schüz, Josué Almansa, Wolfgang Ahrens, Vladimir Bencko, Simone Benhamou, Paolo Boffetta, Bas Bueno-de-Mesquita, Neil Caporaso, Dario Consonni, Paul Demers, Eleonóra Fabiánová, Guillermo Fernández-Tardón, John Field, Francesco Forastiere, Lenka Foretova, Pascal GuénelPer Gustavsson, Vladimir Janout, Karl-Heinz Jöckel, Stefan Karrasch, Maria Teresa Landi, Jolanta Lissowska, Danièle Luce, Dana Mates, John McLaughlin, Franco Merletti, Dario Mirabelli, Tamás Pándics, Marie-Élise Parent, Nils Plato, Hermann Pohlabeln, Lorenzo Richiardi, Jack Siemiatycki, Beata Świątkowska, Adonina Tardón, Heinz-Erich Wichmann, David Zaridze, Kurt Straif, Hans Kromhout, Roel Vermeulen

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Rationale: Although the carcinogenicity of diesel engine exhaust has been demonstrated in multiple studies, little is known regarding exposure-response relationships associated with different exposure subgroups and different lung cancer subtypes.Objectives: We expanded on a previous pooled case-control analysis on diesel engine exhaust and lung cancer by including three additional studies and quantitative exposure assessment to evaluate lung cancer and subtype risks associated with occupational exposure to diesel exhaust characterized by elemental carbon (EC) concentrations.Methods: We used a quantitative EC job-exposure matrix for exposure assessment. Unconditional logistic regression models were used to calculate lung cancer odds ratios and 95% confidence intervals (CIs) associated with various metrics of EC exposure. Lung cancer excess lifetime risks (ELR) were calculated using life tables accounting for all-cause mortality. Additional stratified analyses by smoking history and lung cancer subtypes were performed in men.Measurements and Main Results: Our study included 16,901 lung cancer cases and 20,965 control subjects. In men, exposure response between EC and lung cancer was observed: odds ratios ranged from 1.09 (95% CI, 1.00-1.18) to 1.41 (95% CI, 1.30-1.52) for the lowest and highest cumulative exposure groups, respectively. EC-exposed men had elevated risks in all lung cancer subtypes investigated; associations were strongest for squamous and small cell carcinomas and weaker for adenocarcinoma. EC lung cancer exposure response was observed in men regardless of smoking history, including in never-smokers. ELR associated with 45 years of EC exposure at 50, 20, and 1 μg/m3 were 3.0%, 0.99%, and 0.04%, respectively, for both sexes combined.Conclusions: We observed a consistent exposure-response relationship between EC exposure and lung cancer in men. Reduction of workplace EC levels to background environmental levels will further reduce lung cancer ELR in exposed workers.

Original languageEnglish
Pages (from-to)402-411
Number of pages71
JournalAmerican Journal of Respiratory and Critical Care Medicine
Issue number3
Early online date24-Apr-2020
Publication statusPublished - 1-Aug-2020
Externally publishedYes

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