Evidence map›Paper›PMID 25870974›Full record

SynthesisEnvironmental health perspectives2015

Lung Cancer and Exposure to Nitrogen Dioxide and Traffic: A Systematic Review and Meta-Analysis.

Ghassan B Hamra, Francine Laden, Aaron J Cohen, Ole Raaschou-Nielsen, Michael Brauer, Dana Loomis

Registry-linked trialOpen access · diamondAbstract readMeta-AnalysisSystematic Review
In one paragraph

Synthesis in Environmental health perspectives, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT07383454 (Lung Cancer Screening in Population Who Had Never Smoked and the Validation of Lung Cancer Risk Prediction Model), which is not on this map. Cited by 115 papers, 11 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
115citing papers in PubMed, 11 pooled it
16.6field-weighted citation impact, top 1% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

NCT07383454 nanot yet recruitingnot on this mapstarted 2026, after this paper: background citation

Lung Cancer Screening in Population Who Had Never Smoked and the Validation of Lung Cancer Risk Prediction Model

TypeinterventionalSponsorChung Shan Medical UniversityRan2026 to 2034Enrolled2,500ConditionsLung Cancer (Diagnosis), Non-Small Cell Lung Cancer, Small Cell Carcinoma of Lung, Screening StrategyArmsLow dose computed tomography
3 · Its place in the literature

Who cites it

115 citing papers in PubMed, 11 syntheses or guidelines pooled it, 419 citations in OpenAlex.

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  13. Au-Decorated WSSensors (Basel, Switzerland) · 2026
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55 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

6 authors at 6 institutions in 5 countries.

Ghassan B HamraDepartment of Environmental and Occupational Health, Drexel University School of Public Health, Philadelphia, Pennsylvania, USA.
Francine Laden
Aaron J Cohen
Ole Raaschou-Nielsen
Michael Brauer
Dana Loomis
Brigham and Women's Hospital · USCentre international de recherche sur le cancer · FRDanish Cancer Society · DKDrexel University · USHealth Effects Institute · USUniversity of British Columbia · CA

Funding

World Health Organization 001
6 · The paper itself

Abstract

BACKGROUND AND

objectiveExposure to traffic-related air pollutants is an important public health issue. Here, we present a systematic review and meta-analysis of research examining the relationship of measures of nitrogen oxides (NOx) and of various measures of traffic-related air pollution exposure with lung cancer.

methodsWe conducted random-effects meta-analyses of studies examining exposure to nitrogen dioxide (NO2) and NOx and its association with lung cancer. We identified 20 studies that met inclusion criteria and provided information necessary to estimate the change in lung cancer per 10-μg/m3 increase in exposure to measured NO2. Further, we qualitatively assessed the evidence of association between distance to roadways and traffic volume associated with lung cancer.

resultsThe meta-estimate for the change in lung cancer associated with a 10-μg/m3 increase in exposure to NO2 was 4% (95% CI: 1%, 8%). The meta-estimate for change in lung cancer associated with a 10-μg/m3 increase in NOx was similar and slightly more precise, 3% (95% CI: 1%, 5%). The NO2 meta-estimate was robust to different confounding adjustment sets as well as the exposure assessment techniques used. Trim-and-fill analyses suggest that if publication bias exists, the overall meta-estimate is biased away from the null. Forest plots for measures of traffic volume and distance to roadways largely suggest a modest increase in lung cancer risk.

conclusionWe found consistent evidence of a relationship between NO2, as a proxy for traffic-sourced air pollution exposure, with lung cancer. Studies of lung cancer related to residential proximity to roadways and NOx also suggest increased risk, which may be attributable partly to air pollution exposure. The International Agency for Research on Cancer recently classified outdoor air pollution and particulate matter as carcinogenic (Group 1). These meta-analyses support this conclusion, drawing particular attention to traffic-sourced air pollution. CITATION: Hamra GB, Laden F, Cohen AJ, Raaschou-Nielsen O, Brauer M, Loomis D. 2015. Lung cancer and exposure to nitrogen dioxide and traffic: a systematic review and meta-analysis. Environ Health Perspect 123:1107-1112; http://dx.doi.org/10.1289/ehp.1408882.

Indexed as

Vehicle EmissionsAir PollutantsEnvironmental ExposureHumansIncidenceLung NeoplasmsNitrogen DioxideNitrogen OxidesRisk FactorsAir PollutantsNitrogen DioxideNitrogen OxidesVehicle Emissions

Identifiers

PMID25870974
PMCPMC4629738
OpenAlexW2087621972

What OpenQuestion holds

Textmetadata
LicenceCC0
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Registered trials

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.