By Jeese P. Greenstein, Alexander Haddow (Eds.)

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R. R. R . . . . . . . . . . . . . . . . . . . . . . . . . E. R . . . . . . . . . . . . . . . . . . . . . . . . . E. 30 ~~~~ ~ ~ ~ ~ *After Curwen, Kennaway, and Kennaway, 1954. t Based on 17 deaths; other figures in parentheses on 25-100 deaths and all others on more than 100 deaths. B. Pollution of Town Air. Three known carcinogens have been detected among the pollutants of town air: arsenic, 3,4-benzpyrene1 and radium. The amount of arsenic was, however, of the order of 6 pg.

I n the present state of ignorance, however, it is probably better not to attempt any exact correlation; but to note only that if smoking is a major cause of lung cancer it will be difficult to account for the figures unless there is also a considerable difference in the relative effects of smoking cigarettes and pipes. It is almost equally difficult to decide whether differences in smoking habits are adequate to account for the difference in mortality observed in men and women. At first sight it would seem unlikely that they were, since women have been responsible for an increasing proportion of the total amount smoked and, in all countries, the preponderance of men among subjects of the disease has become more marked.

8). Since the mortality was considerably less among men who had been employed for less than 10 years in the conditions which existed before 1932, when measures were taken t o reduce the amount of dust in the atmosphere, it must be presumed that the risk had a t one time been appreciably greater than the average estimated over the whole period. The occurrence of lung cancer in 14 out of 72 subjects found to have asbestosis a t autopsy has been reported by Bonser (1955). The number of men employed in all these occupations taken together constitutes only a small fraction of the total number of men employed in industry, and the number of cases of lung cancer due to these special hazards can have contributed only a very small proportion t o the total number of cases.

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Advances in Cancer Research, Vol. 3 by Jeese P. Greenstein, Alexander Haddow (Eds.)
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