Alterations in laryngeal mucosa after exposure to asbestos

Our plain-English summary of Alterations in laryngeal mucosa after exposure to asbestos, by D. Davies (British Journal of Industrial Medicine, 1990).

The study

• Author: D. Davies
• Journal: British Journal of Industrial Medicine
• Published: 1990;47(12):844
• Type of article: Comment, Letter
• Read it: PubMed · Publisher · Free full text
• In J-M's library: Johns-Manville's company medical library held a copy (J-M no. 001610).

In plain English

This item was a letter to the editor, followed by a reply from the authors it criticised. The letter's author objected to a 1989 paper by Kambic and colleagues that used the term "laryngeal asbestosis." That paper had compared workers in asbestos cement plants with a control group living in a mountain settlement. The letter's author argued that the workers' high incidence of chronic laryngitis was attributed to asbestos while cement dust was ignored, and that the control group should have been cement workers not using asbestos. In reply, the original authors said that chronic laryngitis in their study correlated with the degree of workplace pollution with asbestos fibres. They reported that scanning electron microscopy of biopsies from 10 workers who needed vocal cord surgery showed asbestos fibres on the epithelium in three. They stated that after workers stopped direct asbestos exposure, alcohol abuse and smoking, the laryngeal mucosa was within normal limits, but did not say how many workers this applied to. They acknowledged that measuring each factor's contribution was not their purpose.

We wrote this plain-English summary from the full article with the help of AI, and a second AI model checked each sentence against the article. It is not the authors' wording; the abstract and the article are their own account.

What the study did and found

• Design: Letter to the editor (correspondence) criticising a published study, with the original authors' reply; no new study was carried out by the letter's author
• Who was studied: No population of its own. The letter discussed the 1989 study by Kambic et al, which compared workers in asbestos cement plants with a control group living in a mountain settlement
• Exposure: Asbestos (fibre type not stated) and cement dust in asbestos cement plants
• Main results:
  • The letter's author argued that the original study attributed the high incidence of chronic laryngitis in the workers to asbestos without considering cement dust, and that the control group should have been cement workers not using asbestos
  • In their reply, the original authors stated that the occurrence of chronic laryngitis correlated with the degree of workplace pollution with asbestos fibres (table 6 of their original paper)
  • The original authors reported that scanning electron microscopy of biopsy specimens from 10 workers who needed surgical treatment (stripping of the vocal cords) showed asbestos fibres on the epithelium in three
  • The original authors reported that after workers were no longer directly exposed to asbestos dust and had stopped alcohol abuse and smoking, the laryngeal mucosa was found to be within normal limits; the reply does not say how many workers this applied to
• The authors' conclusion: The letter's author concluded that the results did not justify the term "laryngeal asbestosis". The original authors replied that they maintained the term, and stated their strong belief that the return of the mucosa to normal at least partially explains the cause of the lesions
• Limitations the authors state:
  • The original authors stated in their reply that determining to what extent particular factors contribute to the disease was not the purpose of their work

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