Abstract
Background
Risk factors for malignant tumours of the central nervous system (CNS) are largely unknown.
Methods
We pooled six European cohorts (N = 302,493) and assessed the association between residential exposure to nitrogen dioxide (NO2), fine particles (PM2.5), black carbon (BC), ozone (O3) and eight elemental components of PM2.5 (copper, iron, potassium, nickel, sulfur, silicon, vanadium, and zinc) and malignant intracranial CNS tumours defined according to the International Classification of Diseases ICD-9/ICD-10 codes 192.1/C70.0, 191.0–191.9/C71.0–C71.9, 192.0/C72.2–C72.5. We applied Cox proportional hazards models adjusting for potential confounders at the individual and area-level.
Results
During 5,497,514 person-years of follow-up (average 18.2 years), we observed 623 malignant CNS tumours. The results of the fully adjusted linear analyses showed a hazard ratio (95% confidence interval) of 1.07 (0.95, 1.21) per 10 μg/m³ NO2, 1.17 (0.96, 1.41) per 5 μg/m³ PM2.5, 1.10 (0.97, 1.25) per 0.5 10−5m−1 BC, and 0.99 (0.84, 1.17) per 10 μg/m³ O3.
Conclusions
We observed indications of an association between exposure to NO2, PM2.5, and BC and tumours of the CNS. The PM elements were not consistently associated with CNS tumour incidence.
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Data availability
The exposure maps are available on request from Dr Kees de Hoogh (c.dehoogh@swisstph.ch). The cohort data is not available for sharing due to strict national data protection regulations and the General Data Protection Regulation of the European Union. The ELAPSE study protocol is available at http://www.elapseproject.eu/. A detailed statistical analysis plan is available on reasonable request from the corresponding author (ullah@cancer.dk).
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Acknowledgements
We thank Marjan Tewis for the data management tasks in creating the pooled cohort database and the National Institute for Public Health and the Environment (RIVM), Bilthoven, the Netherlands, for their contribution to the ELAPSE Study.
Funding
The research described in this article was conducted under contract to the Health Effects Institute (HEI), an organisation jointly funded by the United States Environmental Protection Agency (EPA) (Assistance Award No. R-82811201) and certain motor vehicle and engine manufacturers. The contents of this article do not necessarily reflect the views of HEI, or its sponsors, nor do they necessarily reflect the views and policies of the EPA or motor vehicle and engine manufacturers.
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GH, ORN and UAH: study conceptualisation and design; GH and BB: principal investigators of the ELAPSE project; UAH: statistical analysis and manuscript writing; GH, ORN and BB: supervision, manuscript review and editing; GH, BB, JC and MS: ELAPSE project coordination, preparing pooled data for analyses, and providing support with the access to pooled cohort data; SR, ES and KK: contribution of statistical analyses strategy and scripts for the statistical analyses; KdH, JC and GH: exposure assessment; JB: exposure data. All authors contributed to the interpretation of the results. All authors read and revised the manuscript for the important intellectual content and approved the final draft of the manuscript.
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This study involved no contact with members of the study population and the published results does not allow identification of individuals. The analyses were undertaken in a secure IT environment where no individual level data can be retrieved. All included cohort studies were approved by the medical ethics committees in their respective countries.
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Hvidtfeldt, U.A., Chen, J., Rodopoulou, S. et al. Long-term air pollution exposure and malignant intracranial tumours of the central nervous system: a pooled analysis of six European cohorts. Br J Cancer 129, 656–664 (2023). https://doi.org/10.1038/s41416-023-02348-1
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DOI: https://doi.org/10.1038/s41416-023-02348-1