Saranac Program - Annual Report for the Study of Tuberculosis

Our plain-English summary of Saranac Program - Annual Report for the Study of Tuberculosis, by L.U. Gardner (1942).

The study

• Author: L.U. Gardner
• Published: 1942
• Type of article: Report
• 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 document is the 1942 annual report of the Director of the Saranac Laboratory for the Study of Tuberculosis in Saranac Lake, New York. It describes the laboratory's ongoing work rather than a single study, and much of the scanned text is unreadable. From guinea pig experiments using inhaled dust and injection into the windpipe, the report stated that further studies confirmed the laboratory's earlier conclusion that asbestosis, unlike silicosis, is not a progressive disease. Attempts to counter chrysotile asbestos with the alpha monohydrate of aluminum, which had worked against quartz, were completely ineffective: fibrosis and asbestosis body formation developed as in untreated animals. A very pure crocidolite from Bolivia, with straight fibres unlike the flexible fibres of South African crocidolite, was also tested in guinea pig lungs, but the result is illegible in the scan. The report described three more autopsied cases of pneumoconiosis from the tremolite talc industry. All showed connective tissue reaction and "asbestosis" body formation, as had 8 earlier specimens, and one also had silicosis. Inhaled glass fibres produced no fibrosis after three years.

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: Institutional annual report (Director's report) summarizing ongoing animal experiments (inhalation and intratracheal injection in guinea pigs) and autopsy observations; not a single research study
• Who was studied: Guinea pigs in laboratory experiments, and human autopsy cases, including 3 new cases (and 8 previous specimens) from the tremolite talc industry in the western part of the state
• Exposure: Chrysotile asbestos (with and without aluminum alpha monohydrate), a very pure crocidolite from Bolivia, tremolite talc dust in industry, glass fibres, and other dusts (diatomaceous earth, quartz, granular silicates including talc)
• Main results:
  • In guinea pig studies by inhalation and intratracheal injection, the laboratory again found that asbestosis, unlike silicosis, was not a progressive disease
  • In animals given chrysotile with aluminum alpha monohydrate, fibrosis and asbestosis body formation developed as in untreated animals
  • When chrysotile was suspended in the aluminum hydroxide before injection into the trachea, the mixture caused an acute bronchopneumonia that was often fatal
  • A very pure crocidolite from Bolivia was tested in guinea pig lungs; the scanned result is illegible
  • All 3 new autopsy cases from the tremolite talc industry showed cellular connective tissue reaction and "asbestosis" body formation, as in all 8 previous specimens from this industry
  • One of the 3 tremolite talc cases had very advanced fibrosis complicated by silicosis, with high quartz content in the tissues
  • After three years of inhalation exposure to thin glass fibres, guinea pigs showed no fibrosis
• The authors' conclusion: The author concluded that asbestosis is not a progressive disease, and that nothing so far suggested aluminum therapy would be useful against asbestos-caused fibrosis
• Limitations the authors state:
  • For the granular silicate minerals (including talc) placed in guinea pig lungs, pressure of other work had prevented detailed examination of the results
  • In the aluminum inhalation treatment of silicotic guinea pigs, the number of animals was too small

Topics

Medical terms in this study, explained in our Lexicon: Saranac Laboratory, Silicosis, Chrysotile, Fibrosis, Crocidolite, Pneumoconiosis, Tremolite, Talc.

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