Annual Report to the Nation Finds Continued Declines in Overall Cancer Rates; Special Feature Highlights Current and Projected Trends in Colorectal Cancer
12/07/2009
http://www.cancer.gov/newscenter/pressreleases/ReportNation2009Release
減少の原因は禁煙政策による男性の肺がんなどの減少。さらに禁煙をすすめることで減らせる。