Unpublished data on asbestos dust continue to surface

Our plain-English summary of Unpublished data on asbestos dust continue to surface, by T.F. Mancuso (American Journal of Industrial Medicine, 1994).

The study

• Author: T.F. Mancuso
• Journal: American Journal of Industrial Medicine
• Published: 1994;25(3):457-60
• Type of article: Historical article, Letter
• Cited by: 1 article, as counted by NIH iCite
• Read it: PubMed · Publisher

In plain English

This is a letter to the editor, not a research study. The author described a 1957 company medical and chest X-ray survey summary, marked "Top Secret," that was found in U.S. Rubber (later Uniroyal Inc.) corporate files and disclosed as a Mississippi court exhibit in April 1993. The author linked it to the Hogansville, Georgia, asbestos plant where Wells had said in 1964 that there was no safe level of asbestos dust. The survey covered 118 active and eight transferred employees, grouped by years of exposure and dust level in million particles per cubic foot (MPPCF). Of 63 workers exposed 5 or more years to 5.0 MPPCF or more, 43 had normal chests, 9 had "suspicious symptoms of early asbestosis," 4 had moderate advanced asbestosis and 1 had advanced asbestosis. Of 17 exposed 5 or more years to less than 5.0 MPPCF, 6 had suspicious early asbestosis. All 46 exposed under 5 years to less than 5.0 MPPCF had normal chests. Citing a 1955 report by Pendergrass, a consultant to Wells and the company, on the limits of X-rays, the author argued that "normal" readings understate asbestosis.

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• Design: Letter to the editor presenting previously unpublished historical company documents (a 1957 medical and X-ray survey summary and a 1955 consultant report) produced as court exhibits
• Who was studied: 118 active employees and 8 transferred employees of the company Wells referred to (U.S. Rubber, later Uniroyal Inc., according to the reference list), surveyed as of 1957
• Exposure: Asbestos dust, measured in millions of particles per cubic foot (M.P.P.C.F.). Workers were grouped as 5 or more years at 5.0 or more M.P.P.C.F. (63), 5 or more years at less than 5.0 M.P.P.C.F. (17), and less than 5 years at less than 5.0 M.P.P.C.F. (46). No fiber type is named.
• Main results:
  • Of the 63 employees exposed 5 or more years to 5.0 or more M.P.P.C.F.: 43 had normal chests, 6 questionable lung conditions, 9 suspicious symptoms of early asbestosis, 4 moderate advanced asbestosis and 1 advanced asbestosis
  • Of the 17 employees exposed 5 or more years to less than 5.0 M.P.P.C.F.: 9 had normal chests, 2 questionable lung conditions and 6 suspicious symptoms of early asbestosis. The author describes this as 35% "early asbestosis".
  • Of the 46 employees exposed less than 5 years to less than 5.0 M.P.P.C.F., all had normal chests
  • A 1955 report by Pendergrass to the company described one exposed individual with microscopic evidence of asbestosis but no sign of disease on chest X-ray
• The authors' conclusion: The author concluded that the chest X-ray designation "normal" was misleading and understated asbestosis in every exposure category, and that Pendergrass's observations emphasize the significance of the 1957 findings, especially in workers exposed to less than 5.0 M.P.P.C.F. for 5 or more years. The author closed by restating Wells's conclusion that there is no safe level.
• Limitations the authors state:
  • The author states that chest X-ray readings of "normal" in the 1957 survey understate the actual asbestosis

Topics

The National Library of Medicine indexes this study under subjects our site covers: Asbestosis.

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