Carcinogenicity of fibers and films: a theory

Our plain-English summary of Carcinogenicity of fibers and films: a theory, by V.E. Archer (Medical Hypotheses, 1979).

The study

• Author: V.E. Archer
• Journal: Medical Hypotheses
• Published: 1979;5(11):1257-62
• Cited by: 25 articles, as counted by NIH iCite
• Read it: PubMed · Publisher

Abstract

A theory based on frustrated phagocytosis is advanced to explain the carcinogenesis of fibers and films. Exocytosis combined with flexion of a foreign body permits the escape of superoxide radicals which, in a manner similar to that postulated for ionizing radiation, induces somatic mutations. The theory is subject to experimental verification, and offers hope for the development of preventive therapy which can be used to prevent some of the fibrosis and cancer resulting from asbestos inhalation.

In plain English

This 1979 article was a theory paper, not a study. It reported no new experiments, patients or measurements. The byline names two authors, V.E. Archer of NIOSH and W.C. Dixon of OSHA. They offered an explanation for why some microscopic fibers and thin plastic films cause tumors, drawing on earlier published work. They proposed that cells trying to engulf a foreign body too large to swallow release reactive oxygen radicals. More of these radicals might leak out when the object is smooth and flexes with tissue movement. The authors suggested the leaked radicals could kill some nearby cells and cause mutations leading to cancer in others. In their view this explained why short fibers flex less and can be engulfed, and so are less carcinogenic. They predicted that a shortage of certain dietary trace elements would increase cancer from fibers and films. They said this could be tested by experiment. The authors concluded it is possible that such radicals cause tissue injury leading to fibrosis and tumors. They noted that some of the theory's premises had not all been established experimentally.

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: Theoretical (hypothesis) paper; no original data
• Who was studied: No people or animals were studied; the authors drew on previously published experimental work
• Exposure: Microscopic fibers (including asbestos and fibrous glass) and thin plastic films, discussed in general terms; no specific asbestos fiber type is singled out
• Main results:
  • Proposed, not tested: leakage of oxygen radicals from cells attempting to engulf a large foreign body may be greatly enhanced when a smooth object flexes
  • Proposed, not tested: leaked radicals reaching adjacent cells would kill some and might cause cancer-causing point mutations in others
  • The authors said their theory accounts for short fibers being less carcinogenic: they flex less and can be engulfed by phagocytes
  • Prediction offered for testing: a deficiency of trace elements needed for enzymes that detoxify oxygen radicals would increase carcinogenesis by fibers and films
• The authors' conclusion: The authors concluded it is possible that enough reactive oxygen radicals are released during repeated attempts to engulf some foreign bodies to cause tissue injury, leading to fibrosis and tumors
• Limitations the authors state:
  • The authors noted that the similarities between carcinogenic fibers and films, and the postulated differences in flexibility, have not all been established experimentally
  • The authors noted that one earlier set of observations (Boone et al) may not be consistent with the theory

Topics

Medical terms in this study, explained in our Lexicon: Frustrated Phagocytosis, Carcinogenesis, Superoxide, Somatic Mutation, Fibrosis.

Related studies

• Asbestos-induced endothelial cell activation and injury. Demonstration of fiber phagocytosis and oxidant-dependent toxicity — J.G. Garcia, L.D. Gray, et al. (1988)
• The chronic effects of exposure of rats to sized glass fibres — R.T. Drew, M. Kuschner, et al. (1987)
• Interpretation of the carcinogenicity of amosite asbestos and ferroactinolite on the basis of retained fiber dose and characteristics in vivo — P.M. Cook, L.D. Palekar, et al. (1982)
• Observations on the carcinogenicity of asbestos fibers — M.C. Jaurand (1991)
• Perspectives on refractory ceramic fiber (RCF) carcinogenicity: comparisons with other fibers — H. Greim, M.J. Utell, et al. (2014)
• Cellular ingestion, toxic effects, and lesions observed in human bronchial epithelial tissue and cells cultured with asbestos and glass fibers — A. Haugen, P.W. Schafer, et al. (1982)

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