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Updated: Sep 22, 2025
12:04
Assessment of the Cytotoxic and Immunomodulatory Effects of Substances in Human Precision-cut Lung Slices
Published on: May 9, 2018
14.1K
Methyl methacrylate and respiratory sensitisation: a comprehensive review
Mark A Pemberton1, Ian Kimber2
1Director, Systox Ltd, Sutton, Cheshire, UK.
Critical Reviews in Toxicology
|May 24, 2022
Summary
Evidence is lacking to classify methyl methacrylate (MMA) as a respiratory sensitiser. This review suggests current data and occupational asthma challenges hinder definitive classification, recommending improved human data interpretation for causation.
Area of Science:
- Toxicology
- Occupational Health
- Respiratory Medicine
Background:
- Methyl methacrylate (MMA) is currently classified as a skin and respiratory irritant and a weak skin sensitiser.
- A recent proposal suggested reclassifying MMA as a respiratory sensitiser, based on human data interpretation.
Purpose of the Study:
- To critically review and analyse the evidence regarding MMA's potential classification as a respiratory sensitiser.
- To address challenges in establishing causation for occupational asthma.
Main Methods:
- A comprehensive literature review.
- A detailed weight of evidence analysis of human data.
- Examination of diagnostic challenges in occupational asthma.
Main Results:
- The analysis found a lack of persuasive evidence to support classifying MMA as a respiratory sensitiser.
- Difficulties in distinguishing allergic asthma, non-allergic asthma, and exacerbation of pre-existing asthma were identified.
- A lack of validated methods for identifying true chemical respiratory allergens was noted.
Conclusions:
- Current evidence does not convincingly support classifying MMA as a respiratory sensitiser.
- Establishing causation for occupational asthma is complex due to diagnostic challenges and data interpretation issues.
- Recommendations are proposed to enhance the interpretation of human data for occupational asthma causation studies.
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