Cited by 46Occupational and environmental lung diseasesOccupational Health and Global JusticeInterstitial Lung Diseases and Idiopathic Pulmonary Fibrosis

The DOI matches its Crossref record; 29 of the 29 references it cites were found in a registry or an index; none of the 62 sources its claims cite is checked for support yet.

Fiber burden and asbestos-related diseases: an umbrella review

Open access
Ramada Rodilla, José María, Calvo Cerrada, Beatriz, Serra Pujadas, Consol, Delclos, George L., Benavides, Fernando G.·2022·Gaceta Sanitaria

Abstract

OBJECTIVE: What are the levels of asbestos exposure that cause each type of health effect? The objective of this study was to review the available scientific evidence on exposure levels for asbestos and their relationship to health effects. METHOD: An umbrella review of English-language reviews and meta-analyses, from 1980 to March 2021 was conducted. We included reviews involving quantified asbestos exposures and health outcomes. The review has been adapted to the indications of the PRISMA declaration. Methodological quality of the selected studies was assessed using the AMSTAR instrument. RESULTS: We retrieved 196 references. After applying the search strategy and quality analysis, 10 reviews were selected for in-depth analysis. For lung cancer, the highest risk was observed with exposure to amphiboles. Longer, thinner fibers had the greatest capacity to cause lung cancer, especially those > 10 μm in length. For mesothelioma, longer and thinner fibers were also more pathogenic; amphiboles ≥ 5 μm are especially associated with increased mesothelioma risk. No studies observed an increased risk for lung cancer or mesothelioma at asbestos exposure levels <0.1 f/ml. No reviews provided information on exposure concentrations for pulmonary fibrosis. Currently, there is limited evidence in humans to establish the causal relationship between gastrointestinal cancer and asbestos exposure. CONCLUSIONS: Banning all asbestos exposure remains the best measure to preventing its negative health effects. The highest quality reviews and meta-analyses support that there is little risk of lung cancer or mesothelioma at daily exposure levels below 0.1 f/ml.

Overview

AI snapshot

Written from the paper’s full text.

TL;DR

This umbrella review synthesized 10 systematic reviews/meta-analyses on quantified asbestos exposure and health outcomes. It found the highest risks with amphibole fibers and longer, thinner fibers, with little risk of lung cancer or mesothelioma reported below 0.1 f/ml, while still advocating a global ban on all asbestos exposure.

Key findings

  • Among 10 selected reviews, 9 assessed asbestos–lung cancer, 6 pleural mesothelioma, 1 pulmonary fibrosis, and 1 gastrointestinal cancer. The highest lung cancer risk was observed with amphibole fibers, followed by mixed fibers, then chrysotile; fibers >10 μm in length were more carcinogenic, and thinner fibers had greater capacity to cause lung cancer.
  • For mesothelioma, longer and thinner fibers were more pathogenic, especially amphiboles ≥5 μm. One study reported expected mortality risk proportionality of 1:100:500 for chrysotile, amosite, and crocidolite, respectively; another non-occupational exposure study found amphibole fibers had a meta-RR 2.5–3.2 times greater than mixed fibers and 5.3–5.6 times greater than pure chrysotile.
  • No studies observed increased risk for lung cancer or mesothelioma at asbestos exposure levels <0.1 f/ml. One study concluded the highest cumulative chrysotile exposure without lung cancer effect was 25 f/ml-y, and without mesothelioma effect was 15 f/ml-y.
  • For pulmonary fibrosis, long fibers >5 μm were associated with asbestosis and cancer, with no evidence of pathogenicity for fibers ≤5 μm. For gastrointestinal cancer, the association was absent or very low (RR, OR, and SMR around 1), though gastric cancer SMR was 1.43 for chrysotile >140 f/ml-y and 3.21 for amosite >1000 mppcf-y, and colon cancer SMR was 2.31 at >140 f/ml-y.

Methods

  • Umbrella review of English-language systematic reviews and meta-analyses published from 1980 to March 2021, searching MEDLINE/PubMed, Google Scholar, IARC, ATSDR, EPA, HSE, and IWH; both human and experimental animal studies were included. The review followed PRISMA indications and was registered at PROSPERO.
  • From 207 initially retrieved references, 122 duplicates were removed, leaving 85; after title and abstract screening and full-text review, 10 articles were selected for in-depth analysis. Methodological quality was assessed with the AMSTAR instrument.

Limitations

  • The paper states that publication bias is possible because unpublished studies may be overlooked, though it argues this is unlikely given the inclusion of leading institutional websites.
  • The paper notes that exposure measures are often reconstructions made decades after exposure, which can have a large margin of error when applied to individual patients.
  • The text makes evident that no reviews provided exposure concentrations for pulmonary fibrosis, human evidence for gastrointestinal cancer causality is limited, and no systematic reviews or meta-analyses were found on laryngeal or ovarian cancer exposure levels. The abstract reports 196 retrieved references while the Results section reports 207 initially retrieved.

Model-written summary. Check it against the paper before relying on it.

Integrity signals

Registry

Crossref · 10.1016/j.gaceta.2021.04.001

Cites

29 of 29 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Figures

Figure 1. Article selection flowchart (1980–2021). *Referenced in tables in online Appendix. ATSDR: Agency for Toxic Substances and Disease Registry; EPA: U.S. Environmental Protection Agency; HSE: Health and Safety Executive; IARC: International Agency for Research on Cancer; IWH: Canadian Institute for Work and Health.
Figure 1. Article selection flowchart (1980–2021). *Referenced in tables in online Appendix. ATSDR: Agency for Toxic Substances and Disease Registry; EPA: U.S. Environmental Protection Agency; HSE: Health and Safety Executive; IARC: International Agency for Research on Cancer; IWH: Canadian Institute for Work and Health.CC BY · PubMed Central

Verification

Claims the paper makes

11 Not checked yet · 9 Check pending · 9 No full text of the sources · 8 No basis given · 6 Own method · 4 Own result · 2 Own interpretation

Verify all 36 references — free account

Show all 21 claims

  • It may state two separate claims as one. 21
  • Probably not a substantial claim. 9
  • The quote only partly states this claim. 1
28 of 28
  • The paper relies on this without support.

    The exposure levels reported in the included reviews are valid proxies for actual individual asbestos exposure, despite being reconstructed decades after exposure.

    “However, most times the measures are reconstructions made decades after the exposure has taken place, which can have a large margin of error when applied to individual patients.33”
  • The paper relies on this without support.

    A no-observed-adverse-effect level (NOAEL) from the included studies indicates a level below which there is no increased risk of disease.

    “According to the highest cumulative exposure level at which no effect was observed (NOAEL), results evaluating the exposure-response among the studies were also inconsistent.”
  • The paper relies on this without support.

    Findings from occupational and non-occupational studies can be combined to infer risk at daily environmental exposure levels below 0.1 f/ml.

    “The joint assessment of the analyzed systematic reviews and meta-analyses leads us to the conclusion that there is little risk of lung cancer or mesothelioma at daily exposure levels below 0.1 f/ml (daily environmental exposure limit value).”
3 of 3

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

Each contradiction between two passages listed here was confirmed by an independent check.

1 of 1

Citations

Cites

Research works printed but not linked: 7

  1. 1995, Instituto Nacional de Seguridad e Higiene en el Trabajo (INSHT). Nota Técnica de Prevención (NTP) 463: Exposición a fibras de amianto en ambientes interiores
  2. American Conference of Governmental Industrial Hygienists (ACGIH). TLV/BEI Guidelines. [Updated on 2021]. [Accessed 2021 January 8]. Available at: https://www.acgih.org/tlv-bei-guidelines/policies-procedures-presentations/overview.
  3. 2014, Fact Sheet: Asbestos.
  4. 2009, Directive 2009/148/EC of the European Parliament and of the Council on the protection of workers from the risks related to exposure to asbestos at work.
  5. 2019, Ministerio de Trabajo, Migraciones y Seguridad Social. Instituto Nacional de Seguridad y Salud en el Trabajo (INSST), Límites de exposición profesional para agentes químicos en España.
  6. 1986, The ILO Asbestos Convention
  7. 2006, Thirteenth Session of the Joint ILO/WHO Committee on Occupational Health Geneva, 9-12 December 2003, International Labor Office

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Metadata

Authors
Ramada Rodilla, J. M., Calvo Cerrada, B., Serra Pujadas, C., Delclos, G. L., & Benavides, F. G.
Affiliations
Universitat Pompeu Fabra (ES)
Venue
Gaceta Sanitaria
Publisher
Elsevier BV
Published
2022-03
Volume
36
Issue
2
Pages
173-183
ISSN
0213-9111 (ISSN-L)
OpenAlex
W3169983245
Cited by
46
References
29
Citations by year
2026: 7 · 2025: 4 · 2024: 17 · 2023: 13 · 2022: 4
FWCI
1.43
Type
journal article
Language
en
Open access
Locations
  • Gaceta Sanitaria (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion, cc-by)
  • Digital Commons-TMC (Texas Medical Center) (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Repositori digital de la UPF (Universitat Pompeu Fabra) (submittedVersion, cc-by)
Funders
Instituto de Salud Carlos III (PI16/00061)
Topics
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Occupational and environmental lung diseases
  • Social Sciences › Health › Occupational Health and Global Justice
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Interstitial Lung Diseases and Idiopathic Pulmonary Fibrosis
Keywords
asbestos exposure, asbestos-related diseases, lung cancer, mesothelioma, pulmonary fibrosis, gastrointestinal cancer, amphibole fibers, exposure thresholds, asbestos ban
MeSH terms
Asbestos, Humans, Lung Neoplasms, Mesothelioma, Occupational Exposure, Asbestos, Amphibole, Risk Assessment

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