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Fibrotic interstitial lung diseases and air pollution: a systematic literature review

Sergio Harari, Ganesh Raghu, Antonella Caminati, Mario Cruciani, Massimo Franchini, Piermannuccio Mannucci
European Respiratory Review 2020 29: 200093; DOI: 10.1183/16000617.0093-2020
Sergio Harari
1U.O. di Pneumologia e Terapia Semi-Intensiva Respiratoria - Servizio di Fisiopatologia Respiratoria ed Emodinamica Polmonare, Ospedale San Giuseppe - MultiMedica IRCCS, Milan, Italy
2Dept of Medical Sciences, San Giuseppe Hospital MultiMedica IRCCS, Milan, Italy
3Dept of Clinical Sciences and Community Health, Università degli Studi di, Milan, Italy
9Both authors contributed equally
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Ganesh Raghu
4Center for Interstitial Lung Diseases, Dept of Medicine, University of Washington, Seattle, WA, USA
9Both authors contributed equally
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Antonella Caminati
1U.O. di Pneumologia e Terapia Semi-Intensiva Respiratoria - Servizio di Fisiopatologia Respiratoria ed Emodinamica Polmonare, Ospedale San Giuseppe - MultiMedica IRCCS, Milan, Italy
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  • For correspondence: lafitta@libero.it
Mario Cruciani
5Italian National Blood Centre, National Institute of Health, Rome, Italy
6Infection Control Committee and Antibiotic Stewardship Programme, AULSS9 Scaligera, Verona, Italy
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Massimo Franchini
5Italian National Blood Centre, National Institute of Health, Rome, Italy
7Dept of Hematology and Transfusion Medicine, Carlo Poma Hospital, Mantua, Italy
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Piermannuccio Mannucci
8Scientific Direction, IRCCS Ca' Granda Maggiore Policlinico Hospital Foundation, Milan
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Abstract

Background Air pollution is hypothesised to be a risk factor for interstitial lung diseases (ILD). This study systematically reviewed the literature regarding the impact of air pollution on idiopathic pulmonary fibrosis (IPF) and fibrotic interstitial lung diseases (ILD).

Methods A computer-assisted literature search of electronic databases was performed to identify studies focused on the association between ILDs and air pollution. Other inclusion criteria required that the article had to be: 1) original; 2) a prospective or retrospective study; and 3) fully published in English. Both randomised clinical trials and observational studies were considered.

Results Only seven studies met the inclusion criteria. All studies investigated the relationship between pollution and IPF, except one that dealt with the relationship between pollution and hypersensitivity pneumonitis. Outcome measures included exacerbation of IPF, mortality, disease severity, prevalence of hypersensitivity pneumonitis, progression and incidence of IPF. On the whole, air pollution levels were negatively associated with outcomes in patients with IPF and fibrotic ILD outcome. The heterogeneity in the measurement and reporting of the end-points limited the performance of a quantitative synthesis of data.

Conclusions This systematic review provides supporting evidence linking exposure to air pollution to poor outcomes in patients with IPF and fibrotic ILD.

Abstract

There is supporting evidence to link ambient air pollution exposure and manifestation of IPF and F-ILD with poor outcomes. The WHO and governmental agencies need to take action to minimise factors contributing to air pollution. https://bit.ly/3bmGzKg

Introduction

Interstitial lung diseases (ILDs) are a heterogeneous group of diseases, with several known and unknown causes and characterised by infiltrates in both lungs. Several intrinsic and extrinsic risk factors are implicated in the pathogenesis of otherwise idiopathic interstitial pneumonias [1]. Idiopathic pulmonary fibrosis (IPF) is a chronic and progressive fibrotic lung disease with a severe prognosis and a median survival of 3–5 years from diagnosis [2]. Air pollution is a global problem and a neglected factor in the pathogenesis of ILD. The importance of eliminating occult environmental factors in evaluating patients with ILD is emphasised in the new guideline for diagnosis of IPF [3].

There is evidence that both genetic and environmental factors are involved in the development of IPF [4–6]. Smoking, occupational exposure to metals, wood dust and viruses such as the Epstein–Barr virus are all associated with IPF incidence [7–12], Johannson et al. [13] observed an association between the risk of acute exacerbations of IPF and ozone (O3) and nitrogen dioxide (NO2) concentrations, suggesting that air pollution may contribute to disease worsening. More recently, exposure to particulate matter (PM) was found to be associated to increased mortality [14], progression of IPF [15] and disease severity, the latter also being associated with higher levels of NO2 [16]. A positive association between NO2 levels and incidence of IPF was also described [17].

These few studies and the large body of evidence supporting the short- and long-term effects of air pollution on respiratory diseases (including COPD, asthma, lung cancer and lung transplant recipients [18–21]) point to further investigation of the relationship between air pollution and IPF. Air pollution has been implicated as a triggering factor for telomere shortening and accelerated senescence, oxidant–antioxidant dysregulation and chronic inflammation, all potential causes of premature exhaustion and abnormalities of alveolar re-epithelialisation, and thus postulated in the pathogenesis of IPF [22]. These mechanisms are linked with different pollutants (O3, NO2, PM). Similar correlations have been reported for other ILDs such as hypersensitivity pneumonitis [23] and interstitial lung abnormalities, that is, early interstitial changes that indicate subclinical ILD [24]. With this background and gaps of knowledge, we undertook a systematic review of the studies published to date and report the findings.

Material and methods

Search strategy and search terms

A computer-assisted literature search of the electronic databases MEDLINE (through PUBMED), EMBASE, SCOPUS, OVID and Cochrane Library was performed (latest search 10 June 2019) in order to identify studies on the association between ILD and air pollution. A combination of the following key words was used to maximise search specificity and sensitivity: “cryptogenic organizing pneumonia”, “bronchiolitis obliterans organizing pneumonia”, “desquamative interstitial pneumonitis”, “respiratory bronchiolitis interstitial lung disease”, “acute interstitial pneumonia”, “lymphocytic pneumonia”, “idiopathic pulmonary fibrosis”, “interstitial lung disease”, “fibrotic interstitial lung disease”, “idiopathic interstitial pneumonia”, “cryptogenic fibrosing alveolitis”, “post-inflammatory pulmonary fibrosis” “hypersensitivity pneumonitis”, “extrinsic allergic alveolitis”, “allergic extrinsic pneumonia”, “interstitial lung abnormalities”, “non-specific interstitial pneumonia”, “eosinophilic pneumonia”, “pulmonary Langerhans” cell granulomatosis”, “air pollution”, “ambient particulate matter”, “PM”, “environmental”, and “atmospheric pollution”. In addition, a manual search was carried out encompassing the references of the included studies and other reviews in order to identify potentially eligible studies not captured by the initial literature search based upon the electronic databases.

Study selection and inclusion/exclusion criteria

Study selection was performed independently by two reviewers (M. Franchini and M. Cruciani), with any disagreement resolved through discussion, as well as on the basis of the opinion of a third reviewer (S. Harari). Eligibility assessment was based on the title or abstract and on the full text if necessary. Articles were eligible for this systematic review if they indicated in the title or abstract the association between air pollution and ILD. Other inclusion criteria were that the article had to be: 1) original; 2) based upon prospective or retrospective studies; and 3) fully published in English in the past 20 years (1999–2019). Both randomised clinical trials and observational studies were considered. Case series, case reports and studies enrolling fewer than 20 patients were excluded.

Data extraction

For each study included in this systematic review, the following data were independently extracted by two reviewers (M. Franchini and M. Cruciani): first author, year of publication, study design, country of origin of the study, sample size, median age and range, and sex distribution. The main study results were also evaluated. Disagreement was resolved by consensus and by means of the opinion of a third reviewer (S. Harari), if necessary.

Assessment of risk of bias in the included studies

As no randomised controlled trials were found in the frame of this systematic review, we assessed the methodological quality of the observational studies following the recommendations from the Cochrane Handbook for Systematic Reviews of Interventions on assessing the quality of nonrandomised studies [25]. We used the Newcastle–Ottawa quality assessment scale (NOS) in order to assess the quality of cohort studies [26]. The methodological quality of cohort studies was assessed by evaluating case selection (four questions relating to the representativeness of the cohort, selection of the unexposed cohort, ascertainment of exposure and demonstration that the outcome of interest was not already present at the start of the study), comparability (exposed and unexposed individuals had to be matched in the design and/or confounders adjusted for in the analysis) and outcomes (three questions relating to the assessment of outcomes, follow-up long enough for outcomes to occur, and follow-up losses). Using the NOS, a study can be given a maximum of four stars for selection, two for comparability and three for outcome.

Results

Figure 1 shows the study selection flow chart. The initial search identified 398 studies with suitable data through key words and reference search. After screening the titles and abstracts and a subsequent full text review, only seven studies fulfilled eligibility criteria. Table 1 summarises the main characteristics and results of the seven studies included in the analysis. Five of them were prospective and two were retrospective cohort studies. Three studies were conducted in North America, two in Europe (Italy and France) and two in Asia (South Korea and India). All studies investigated the relationship between air pollution and IPF, except for one that investigated the relationship between pollution and hypersensitivity pneumonitis, and all were published within the past 6 years (one in 2014, two in 2017, three in 2018 and one in 2019). Sample size varied substantially across the studies. Specific air pollutants assessed by the studies comprised fine particles, particles with a 50% cut-off aerodynamic diameter of <2.5 µm in diameter (PM2.5) [14–16, 23, 24], PM <10 µm in diameter (PM10) [13–17], O3 [13–17, 24], and NO2 [13–17, 24]. Some studies investigated prevalent urban populations [14, 23, 24]. Other studies involved urban, suburban and rural areas [15–17]. In almost all studies pollutants were measured thought fixed air monitors [13–16, 23, 24]. Conti et al. [17] used background and traffic monitoring stations for measurement of NO2 and O3 and satellite aerosol optical depth measurements for PM10. Outcome measures included exacerbation of IPF [13, 14], mortality [14], prevalence of hypersensitivity pneumonitis [23], progression of IPF expressed as forced vital capacity (FVC) decline [15] and disease severity [16], incidence of IPF [17] and presence and progression of interstitial lung abnormalities [24]. The end-points evaluated in the included studies were different and heterogeneous; hence, it was not possible to perform a quantitative synthesis of the data. Nonetheless, all the studies found air pollution levels to be negatively associated with different aspects of IPF and ILD outcomes. Tables 2 and 3 show criterion-specific and global ratings from the study quality assessment.

FIGURE 1
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FIGURE 1

Flow chart of the study selection.

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TABLE 1

Characteristics and main results of the studies on the association between air pollution and intestinal lung disease (ILD)

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TABLE 2

Newcastle–Ottawa scale to evaluate the methodological quality of cohort studies included in the systematic review

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TABLE 3

Newcastle–Ottawa scale summary table

Bias assessment

The results of the NOS are shown in tables 2 and 3. The quality of cohort studies was assessed by examining selection, comparability and outcome. Of the seven studies included, six achieved the maximum of four stars for selection, two stars for comparability and three stars for outcomes. One study achieved the maximum of two stars for comparability, three stars for selection (selected population) and two stars for outcomes (follow-up not long enough for the outcome to occur).

Discussion

To our knowledge, this is the first study that systematically reviewed the existing literature regarding the impact of ambient air pollution on IPF and ILD. Our search identified only seven studies, all published within the last 6 years, that helped to provide evidence linking air pollutants (PM2.5, PM10, O3 and NO2) to modifications in disease behaviour. Taken together, results show that pollution exposure is associated with a more compromised lung function, disease progression (defined as a decline in lung function, specifically in FVC), acute exacerbations, mortality, disease incidence and subclinical ILD. Notwithstanding the different end-points evaluated in the various studies, their message was concordant and suggested a mechanistic role for air pollution in the development and progression of IPF, that starts from subclinical interstitial lung abnormalities, early interstitial changes that indicate subclinical ILD, and thus indicates a mechanistic role of air pollutants in disease progression. The recent perspective by Sack and Raghu [1] shows the association of genetic factors and intrinsic and extrinsic environmental factors in the pathogenesis of IPF and fibrotic ILD.

At a time when the association between air pollution and a number of respiratory diseases (such as asthma, COPD, lung cancer, pneumonias, bronchiectasis and lung transplant) and nonrespiratory diseases [18–21, 27–39] is well established, the association with other lung diseases such as IPF and fibrotic ILD is a subject of more recent and novel interest. The existence and relevance of this association is still controversial, as shown by a recent article on the association between air pollution and lung disease that failed to mention the existence of an association between air pollution and IPF [40]. However, that there is much interest on this topic is witnessed by the fact that all the studies considered in this review were published in the last 6 years. Five of them were classified as prospective cohort studies and two were retrospective, and our assessment of bias using the NOS shows that the quality of the included studies was high.

Johannson et al. [13] published the first study showing a relationship between higher levels of O3 and NO2 exposure in the previous 6 weeks and the development of acute exacerbation of IPF. Sesè et al. [14] confirmed that short-term exposure to increased levels of O3 is a risk factor for acute exacerbation of IPF and demonstrated a statistically significant association between mortality and PM10 and PM2.5 exposure levels. Furthermore, Winterbottom et al. [15] demonstrated a relationship between increased exposure to PM10 and an accelerated decline of FVC. In addition, Johannson et al. [16] showed that higher air pollution exposure were associated with poorer lung function but not with changes in lung function. Conti et al. [17] found a potential association between exposure to traffic-related pollution (traced with NO2) and the development of IPF, and Sack et al. [24] found that exposure to ambient NO2 was associated with a higher prevalence of interstitial lung abnormalities. Finally, Singh et al. [23] showed a strong positive correlation between the prevalence of hypersensitivity pneumonitis cases and PM2.5 levels, thereby supporting the suggestion that air pollution may be a contributing factor to the pathogenesis of hypersensitivity pneumonitis.

The strengths of these included studies pertain to their longitudinal study design [14–17], broad geographical coverage, reliable albeit methodologically different measures of ambient air pollution and adequate statistical analysis. The studies included in our review were carried out in five different countries with very different pollution exposure. This condition, together with the fact that the results of the individual studies go in the same direction, strengthens the reliability of the observations.

The differences in the reported findings may be due to some degree of methodological differences between the cohorts, varying levels of air pollution exposure and outcome definition. Even though the effect size observed on the relationship between air pollution and IPF was rather small, it represents clinically relevant changes.

There are limitations pertaining to the analysed studies, such as the often small patient sample size, lack of relevant data, such as smoking history and socioeconomic level, as well as a lack of confirmation of the disease diagnosis. In addition, the calculation of the degree of exposure to the pollutants was perhaps somewhat inaccurate in some studies, because it is uncertain whether or not the air monitors used to measure pollutant levels were in close proximity to the patient's residences or workplaces [14, 17, 23]. Finally, the studies considered were very different in their outcomes and this made a systematic review difficult. In conclusion, this systematic review provides supporting evidence to link ambient air pollution exposure and manifestation of IPF and fibrotic ILD with poor outcomes.

Suggestion for future directions

Further studies are warranted to investigate the association of air pollution, genetic factors and fibrotic ILD, including IPF.

Follow-up with longitudinal data through ILD registries is needed to enhance further understanding with the association of air pollution and manifestation of fibrotic ILD and disease progression. In the future, it will be important to clarify the relationship between pollution and IPF progression and disease incidence though large and prospective studies. Longitudinal investigations focusing on subject-specific rather than aggregated data, preferably considering exposures at the subjects’ addresses, could substantially improve the reliability of the results.

It is hoped that funding agencies will take the much needed initiative to address air pollution and preventive factors contributing to pathogenesis of fibrotic ILD worldwide. We also hope that the leadership of major respiratory societies will approach regulatory authorities/government to enhance public awareness of the entity of fibrotic ILD, especially hypersensitivity pneumonitis and air pollution in every patient confronted with ILD.

The World Health Organization and governmental agencies need to take immediate action to minimise factors contributing to air pollution and alert the public to the risk of manifesting fibrotic ILD, especially for hypersensitivity pneumonitis in susceptible persons living in urban areas known to have air pollution. Indeed, the public and healthcare communities need to be educated to prevent onset and progression of ILD contributed to by environment factors; prevention is always better than cure. It is hoped that the World Health Organization will implement certain standards to decrease air pollution globally and prevent deadly diseases such chronic hypersensitivity pneumonitis and other fibrotic lung diseases contributed to by environmental factors.

Footnotes

  • Provenance: Submitted article, peer reviewed.

  • Conflict of interest: S. Harari reports grants and personal fees from Roche, outside the submitted work.

  • Conflict of interest: G. Raghu has nothing to disclose.

  • Conflict of interest: A. Caminati reports personal fees from Roche and Boehringer Ingelheim, outside the submitted work.

  • Conflict of interest: M. Cruciani has nothing to disclose.

  • Conflict of interest: M. Franchini has nothing to disclose.

  • Conflict of interest: P. Mannucci has nothing to disclose.

  • Received April 27, 2020.
  • Accepted May 4, 2020.
  • Copyright ©ERS 2020.
http://creativecommons.org/licenses/by-nc/4.0/

This article is open access and distributed under the terms of the Creative Commons Attribution Non-Commercial Licence 4.0.

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European Respiratory Review: 29 (157)
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Fibrotic interstitial lung diseases and air pollution: a systematic literature review
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Fibrotic interstitial lung diseases and air pollution: a systematic literature review
Sergio Harari, Ganesh Raghu, Antonella Caminati, Mario Cruciani, Massimo Franchini, Piermannuccio Mannucci
European Respiratory Review Sep 2020, 29 (157) 200093; DOI: 10.1183/16000617.0093-2020

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Fibrotic interstitial lung diseases and air pollution: a systematic literature review
Sergio Harari, Ganesh Raghu, Antonella Caminati, Mario Cruciani, Massimo Franchini, Piermannuccio Mannucci
European Respiratory Review Sep 2020, 29 (157) 200093; DOI: 10.1183/16000617.0093-2020
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