Document 6Xe0V668L9M5x0JGb9wyBOgE

CANCERS OF THE RESPIRATORY SYSTEM 371 the century, and has gained momentum only recently. In several cities (or large hospitals) no appreciable; changes in the incidence of lung tumors could be demonstrated (Bonser; Passey and Holms; Hanf;. Ask-Upmark; Sitsen; Gruber; Breckwoldt; Marchesani; Eichengriin and Esser; and Neely) (Germany: Koelln, Hamburg, Innsbruck; England: Leeds, Glasgow; Swe den: Lund; Russia: Leningrad; United States: Nebraska). The great majority of reports on this subject, based on death certificates, clinical observa tions, and autopsy findings, note a definite and striking increase of the inci dence of pulmonary neoplasms during the last twenty years (Wells; Simons; Weller; Hruby and Sweany; and Hutchison). Autopsy records, which doubt lessly represent the most reliable source of information and which were ob tained in large and well-controlled institutions, show this trend of increase in a convincing manner. The following compilations may illustrate the course of events during the present century: a) Evidence obtained from death records of the general population. Bureau of Census (U.S.A.): Year Number of hung Cancer fer 100,000 population 1914 1925 1926 0.6 i-7 1.8 1927 Cole: 1.9 1901-1910 1.02 for males and 0.70 for females 5.10 " 1.63 Stocks (England and Wales) ; 1921-1930.. 2.5 1.0 1933 6.7 " 1.8 Kennaway and Kennaway (England and Wales) : 1921 361 deaths from cancer of the lung in males 1932 1553 " " " "" " " " b) Composite data collected from various sources: Author Weller Simons Year No. Autopsies No. Lung Cancer 1872-1898 382,671 159 1898-1916 192,271 488 1916-1924 33.308 7* 1900-1930 22,754 137 1899 from records of n American to 1930 and Canadian investigators Percentage 0.04 O.24 0.21 0.60 1-55 Simons stated that the same American and Canadian sources showed an increase from 5.88 per cent of all cancer in 1910-1914 to 8.28 per cent in i925_i928. Similar observations were made by Ask-Upmark on data from