Changes in Bronchial Epithelium in Relation to Smoking Habits

Our plain-English summary of Changes in Bronchial Epithelium in Relation to Smoking Habits, by O. Auerbach, A.P. Stout, E.C. Hammond, et al.

The study

• Authors: O. Auerbach, A.P. Stout, E.C. Hammond, L. Garfinkel
• Published: n.d.
• 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

The authors described eight years of microscope studies of the airway lining (bronchial epithelium) of people who had died, comparing cell changes with smoking habits. The article does not mention asbestos. Among 339 men who died of causes other than lung cancer (65 who never smoked cigarettes and 274 who did), cigarette smokers showed more basal cell hyperplasia, squamous metaplasia and carcinoma-in-situ than non-smokers. These changes increased with the amount smoked, and 63 men who died of lung cancer showed the most extensive changes. Matched comparisons, with slides read in random order, found more lesions with atypical cells in male than in female cigarette smokers, and in older than younger male cigarette smokers. They found fewer lesions in pipe and cigar smokers than in cigarette smokers. Former cigarette smokers had fewer atypical cells than current cigarette smokers but five times more than non-smokers. Children's airways resembled those of adult non-smokers. The authors concluded that the rise in atypical cells with smoking and their fall after stopping provided a reasonable explanation for the link between cigarette smoking and lung cancer.

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: Series of microscopic (histological) studies of bronchial epithelium from people who had died, with matched comparisons between groups. Smoking histories came from interviews with families. Slides were coded and read in random order.
• Who was studied: First series: 339 men who died of causes other than lung cancer (65 never smoked cigarettes, 274 smoked cigarettes) and 63 men who died of lung cancer, mostly at the Veterans Administration Hospital, East Orange, New Jersey. The authors also studied 33 children under age 15. Cases were later added from eleven hospitals in upstate New York, for 1,522 cases in all. From these the authors drew eleven matched studies of 758 cases, with 35 cross-sections each.
• Exposure: Tobacco smoking: cigarettes by amount smoked per day, pipe, cigar, and former cigarette smoking. The authors also compared sex, age and urban versus rural residence. No asbestos exposure is discussed.
• Main results:
  • Among the men who died of causes other than lung cancer, more basal cell hyperplasia, squamous metaplasia and carcinoma-in-situ were found in cigarette smokers than in non-smokers.
  • The article reports that not one section with carcinoma-in-situ was found in the non-smokers. The article prints 63 non-smokers here but 65 elsewhere.
  • The number and degree of changes increased with the amount of cigarettes smoked.
  • The men who died of lung cancer showed the most extensive changes.
  • In 33 children under 15, the bronchial lining showed essentially the same findings as in adult non-smokers.
  • In matched comparisons, more lesions with many atypical cells were found in male cigarette smokers than in female cigarette smokers.
  • Somewhat more epithelial lesions were found in urban than in rural female non-smokers, but very few atypical cells were found in either group.
  • Two matched groups of women non-smokers who differed in age by 30 years showed no evidence of difference in bronchial lesions.
  • Among male cigarette smokers differing in age by 40 years, many more lesions with large numbers of atypical cells were found in the older group.
  • Fewer epithelial lesions were found in pipe smokers than in cigarette smokers, and far fewer in non-smokers than in either group.
  • Cigar smokers fell between non-smokers (fewest lesions) and cigarette smokers (most lesions).
  • In 72 ex-cigarette smokers matched with 72 non-smokers and 72 current cigarette smokers, atypical cells were found less often in ex-cigarette smokers than in current cigarette smokers, but five times more often than in non-smokers.
  • A new cell type, which the authors termed a disintegrating cell, was seen in 518 of 36,340 sections, and only in sections from ex-cigarette smokers.
• The authors' conclusion: The authors concluded that the cell changes paralleled epidemiologic findings on smoking and lung cancer. In their view, the increase in atypical cells after exposure to cigarette smoke, and the decrease after stopping, provided a reasonable explanation for the relationship between cigarette smoking and lung cancer.

Topics

Medical terms in this study, explained in our Lexicon: Epithelium, Habit, Lung Cancer, Carcinoma.

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