Biological Effects of Asbestos in Relation to Control of Occupational Exposure

Our plain-English summary of Biological Effects of Asbestos in Relation to Control of Occupational Exposure, by M.I. Mikheev (1980).

The study

• Author: M.I. Mikheev
• Published: BIOLOGICAL EFFECTS OF MINERAL FIBRES (J.C. WAGNER, EDITOR), LYON: IARC SCIENTIFIC PUBLICATIONS, VOLUME 30, PP. 819-821 (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 short paper from an IARC conference volume was a discussion piece. It reported no new study, data or measurements. The author discussed the health risks of occupational asbestos exposure and how to set a permissible exposure level. Citing other researchers, the author listed features said to set asbestos apart: an unusual route to target cells, lasting presence of fibres in those cells, no metabolism, and local mechanical and cytotoxic effects. The author argued that chemicals the body breaks down may act only above a threshold, but because asbestos is not metabolized, a 'nonthreshold' approach could apply. That approach had been used for ionizing radiation, and a linear hypothesis could be extended to low levels. The author noted that differences between target cells make the low-dose response hard to determine. Until a permissible level is set, the author called for banning or licensing asbestos use, or limiting exposure to the lowest detectable level. The author also called for health surveillance of workers currently exposed and of those exposed in the past. No fibre types were named in the available text.

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: Discussion or commentary paper (conference contribution); no original data
• Who was studied: No study population; the paper discusses occupational exposure to asbestos in general
• Exposure: Occupational asbestos exposure in general; no fibre types, products, jobs or doses are specified in the available text
• Main results:
  • The author listed absence of metabolism and local mechanical and cytotoxic effects among the specific toxicological features of asbestos, citing Neugut et al. (1978)
  • The author argued that because asbestos is not metabolized, a nonthreshold approach could be applied. This is unlike carcinogenic chemicals that undergo metabolism, where there is theoretical evidence of threshold-type action.
  • The author argued that a time-dose relationship shared by ionizing radiation and asbestos allows a linear hypothesis with extrapolation to low levels
  • The author noted that asbestos can increase the effect of chemical carcinogens, citing work by Lakowicz & Hylden (1978) on asbestos-mediated membrane uptake of benzo[a]pyrene (another study, not this paper's finding)
  • Until a permissible level is established, the author proposed banning or licensing asbestos use or limiting exposure to the lowest detectable level
  • Because of the long latent period, the author called for health surveillance of workers who are currently exposed and of those who were exposed in the past
• The authors' conclusion: The author postulated that a nonthreshold approach could be used to establish an appropriate permissible level of occupational exposure to asbestos
• Limitations the authors state:
  • The author stated that differences in the condition of target cells and their predisposition to malignancy make it very complicated to determine the dose-response curve at low levels

Topics

Medical terms in this study, explained in our Lexicon: Occupational Exposure, IARC, Asbestos Exposure.

Browse return to medical research.