Discussion Summary - Berry

Our plain-English summary of Discussion Summary - Berry, by G. Berry (1980).

The study

• Author: G. Berry
• Published: BIOLOGICAL EFFECTS OF MINERAL FIBRES (J.C. WAGNER, EDITOR), LYON: IARC SCIENTIFIC PUBLICATIONS, VOLUME 30, PP. 861-863 (1980)
• Type of article: Conference paper
• Our copy: from Johns-Manville's own medical library. The article is still under copyright, so we describe it here rather than post it.

In plain English

This item was not a research study. It was a written summary by G. Berry of the MRC Pneumoconiosis Unit of a discussion at a scientific meeting, held after papers that included one by Acheson and Gardner on asbestos dose-response relationships. According to the summary, there was no strong disagreement that dose-response relationships were linear and that there was usually no threshold, although some called the relationships simplistic. The summary stated there was strong evidence that mesotheliomas are caused by household and neighbourhood exposure. Peto noted that the UK standard of 2 fibres/ml was based on a study at an asbestos textile factory in Rochdale, and that a more recent study of the same factory had indicated more disease. The speakers reported a five-fold range in disease rates at a given dose between situations. A study by Hughes and Weill was criticized over tracing through Social Security records, and UK compensation panels were debated. The chairman concluded that a linear dose-response without a threshold provided a practical basis for preventive strategies. No new data were reported.

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: Summary of a discussion session at a scientific meeting (not an original study; no new data)
• Who was studied: No study population. The item records comments by the chairman and discussants on papers presented at the meeting, including Acheson and Gardner's paper.
• Exposure: Asbestos in general, with the fibre type mostly not specified. Topics included occupational exposure at an asbestos textile factory in Rochdale, the UK standard of 2 fibres/ml, household and neighbourhood exposure, and planned research on chrysotile combined with heavy metals and a nitrosamine.
• Main results:
  • There was no strong disagreement with the view that dose-response relationships are linear and that there was usually no threshold, though some criticized the relationships used as simplistic.
  • The summary stated there is strong evidence that mesotheliomas are caused by household and neighbourhood exposure.
  • Peto observed that the UK standard of 2 fibres/ml was based on a study at the Rochdale asbestos textile factory, and that a more recent study of the same factory indicated a higher level of disease than the earlier study.
  • The speakers had found a five-fold range in disease incidence rates at a given dose between different situations.
  • The excess lung cancer mortality at Rochdale among those starting work after 1950 was based on small numbers, might partly be due to chance, and was to be regarded as provisional.
  • The Hughes and Weill study was criticized because tracing was through Social Security records, which might bias the dose-response relationship. Dr Hughes replied that any bias could not be large.
  • In a discussion of UK Pneumoconiosis Medical Panels, Dr Lyons said compensation should be awarded to cases showing pleural changes.
• The authors' conclusion: The chairman, summing up, said that a linear dose-response relationship with no threshold appeared to satisfy the scientific criteria and provided a practical basis for preventive strategies, while keeping in mind the uncertainties and limitations of the available data.

Topics

Medical terms in this study, explained in our Lexicon: Pneumoconiosis, Dose-response relationship, Mesothelioma.

Browse return to medical research.