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There have been many studies of the trend in cancer mortality, but conclusions are exceedingly difficult because of the many factors involved, including better diagnosis now than in the past, the increasing average age of the population and improved statistical methods. This pamphlet, by an experienced statistician, constitutes an able report on the subject.
Cancer Mortality in the United States. I: Trend of Recorded Cancer Mortality in the Death Registration States of 1900 from 1900 to 1935. JAMA. 1940;114(17):1692. doi:10.1001/jama.1940.02810170088031