Pulmonary Asbestos III: Carcinoma of Lung in Asbestos-Silicosis

Our plain-English summary of Pulmonary Asbestos III: Carcinoma of Lung in Asbestos-Silicosis, by K.M. Lynch, W.A. Smith (1935).

The study

• Authors: K.M. Lynch, W.A. Smith
• Published: American Journal of Cancer, Volume 24 (1935)
• Type of article: Journal article
• 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 article was a case report of one man: a 57-year-old white man treated at the Roper Hospital who died in 1934 after pain in his right side, shortness of breath and weight loss. He had worked about twenty-two years as a cotton mill weaver and then, from 1913, about twenty-one years as a weaver at an asbestos factory, in what he called an extremely dusty atmosphere. The article does not name the asbestos type. Asbestosis bodies were found in his sputum, and the final diagnosis in life was asbestosis and chronic indurative pneumonia. At autopsy, an area at the base of the right lung that had looked tuberculous to the eye proved under the microscope to be an epidermoid bronchial carcinoma. The lungs held large numbers of asbestosis bodies, and the fibrosis included hyaline nodules, which the authors took as the mark of silicosis. The authors wrote that there appeared to be no previous report of lung cancer in asbestos miners or mill workers. They concluded that the cancer did not predate the lung fibrosis, and that an origin from chronic bronchial irritation fitted current views.

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: case report (single patient, with clinical history and autopsy)
• Who was studied: one white man, 57 years old at death, first seen at the Shirras Dispensary of the Roper Hospital on January 10, 1934; autopsy March 1934
• Exposure: about 22 years as a weaver in cotton mills, then from 1913 about 21 years as a weaver at an asbestos factory in a very dusty atmosphere, with the last five or six months on wet work instead of dry weaving. The fiber type is not stated.
• Main results:
  • Asbestosis bodies were found in the patient's sputum during life; no tubercle bacilli were found.
  • The final diagnosis in life was asbestosis and chronic indurative pneumonia; the cancer was not diagnosed before death.
  • At autopsy, the right lung base held an epidermoid (squamous) carcinoma shown to arise from a bronchus with squamous metaplasia of its lining.
  • The lungs contained large numbers of asbestosis bodies.
  • Besides diffuse fibrosis, the lungs showed hyaline fibrous nodules, which the authors regarded as the characteristic mark of silicosis. They suggested the cotton mill years may account for the silicotic features.
  • The authors stated that there appeared to be no previous report of lung cancer in asbestos miners or mill workers, while noting that the record of autopsies in asbestosis was not large.
• The authors' conclusion: The authors concluded that the carcinoma appeared to arise from a branch of the bronchus to the right lower lobe and did not antedate the lung fibrosis. They considered an origin from chronic bronchial irritation compatible with the current view of the cause of such tumors.
• Limitations the authors state:
  • The authors stated that the duration of the carcinoma could not be specified.

Topics

Medical terms in this study, explained in our Lexicon: Carcinoma, Silicosis, Sputum, Autopsy, Fibrosis, Lung Cancer.

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