title: Wood dust exposure and lung cancer risk: a meta-analysis.
abstract: Occupational lung cancers represent a major health burden due to their increasing prevalence and poor long-term outcomes. While wood dust is a confirmed human carcinogen, its association with lung cancer remains unclear due to inconsistent findings in the literature. We aimed to clarify this association using meta-analysis. We performed a search of 10 databases to identify studies published until June 2014. We assessed the lung cancer risk associated with wood dust exposure as the primary outcome and with wood dust-related occupations as a secondary outcome. Random-effects models were used to pool summary risk estimates. 85 publications were included in the meta-analysis. A significantly increased risk for developing lung cancer was observed among studies that directly assessed wood dust exposure (RR 1.21, 95% CI 1.05 to 1.39, n=33) and that assessed wood dust-related occupations (RR 1.15, 95% CI 1.07 to 1.23, n=59). In contrast, a reduced risk for lung cancer was observed among wood dust (RR 0.63, 95% CI 0.39 to 0.99, n=5) and occupation (RR 0.96, 95% CI 0.95 to 0.98, n=1) studies originating in Nordic countries, where softwood dust is the primary exposure. These results were independent of the presence of adjustment for smoking and exposure classification methods. Only minor differences in risk between the histological subtypes were identified. This meta-analysis provides strong evidence for an association between wood dust and lung cancer, which is critically influenced by the geographic region of the study. The reasons for this region-specific effect estimates remain to be clarified, but may suggest a differential effect for hardwood and softwood dusts.
authors.affiliation: School of Medicine, Flinders University, Bedford Park, South Australia, Australia.
authors.forename: David G
authors.initials: DG
authors.lastname: Hancock
authors.affiliation: School of Medicine, Flinders University, Bedford Park, South Australia, Australia.
authors.forename: Mary E
authors.initials: ME
authors.lastname: Langley
authors.affiliation: School of Medicine, Flinders University, Bedford Park, South Australia, Australia.
authors.forename: Kwan Leung
authors.initials: KL
authors.lastname: Chia
authors.affiliation: School of Medicine, Flinders University, Bedford Park, South Australia, Australia.
authors.forename: Richard J
authors.initials: RJ
authors.lastname: Woodman
authors.affiliation: School of Medicine, Flinders University, Bedford Park, South Australia, Australia Department of Rheumatology, Southern Adelaide Local Health Network, Adelaide, South Australia, Australia.
authors.forename: E Michael
authors.initials: EM
authors.lastname: Shanahan
mesh_terms: D004391:Dust; D006801:Humans; D008175:Lung Neoplasms / Q000139:chemically induced* / Q000453:epidemiology; D016273:Occupational Exposure / Q000009:adverse effects* / Q000032:analysis; D012307:Risk Factors; D014934:Wood / Q000009:adverse effects*
chemical_list: D004391:Dust
keywords: Meta-analysis < Methodology, speciality; Wood dust < Materials, exposures and occupational