The consequences of exposure to asbestos dust in a wartime gas-mask factory.

This further study of wartime gas-mask workers who were exposed to asbestos dust has shown that among those who worked with crocidolite there is a considerable excess of cases of mesothelioma, a more modest excess of bronchial carcinoma, but no excess of any other type of malignant disease. A dose-response relationship is established in the mesothelioma and bronchial carcinoma patients. It is not possible to base any conclusions on the limited data available for the small number of people exposed to chrysotile for a maximum period of five months. We believe that the identification and measurement of fibres in autoptic lung tissue from patients with accurately known occupational histories of asbestos dust exposure is useful, and a similar study on a population exclusively exposed to chrysotile would be of considerable interest.