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Trends in Right and Left-sided Colon Cancer ROBERT W. BEART,M.D.,* L. JOSEPH MELTON, III, M.D.,$ MORITO MARUTA, M.D.,* MALCOLM B. DOCKERTY, M .D.,+ + HARRY B. FRYDENBERG, M.D.,* W. MICHAEL O FALLON, PH.D.~ Beart RW, Jr., Melton LJ, Maruta M, Dockerty MB, Frydenberg HB, From the *Section of Colon and Rectal Surgery, O'Fallon WM. Trends in right and left-sided colon cancer. Dis Colon Department of Surger?~,] Department of Medical Statistics Rectum 1983;26:393-398. and Epidemiology, and the +Department of Surgical Pathology, The increasing ratio of proximal to distal colorectal carcinomas was Emeritus, Mayo Clinic and Mayo Foundation, confirmed in this population-based study of 668 new cases diagnosed Rochester, Minnesota among Rochester, Minnesota residents between 1940 and 1979. The change was due to a rise in the incidence of proximal lesions (from 15.1 per 100,000 person-years in 1940-59 to 17.3 per 100,000 in 1960-79) and a simultaneous fall in the incidence of distal lesions (from 35.5 to 28.2 Methods per t00,000 person-years). Changes in definitions or referral patterns played no role in these observations, although improved diagnostic The population of Rochester, Minnesota is well suited capabilities may have had an impact on the incidence of proximal for studies of the natural
Diseases of the Colon & Rectum – Wolters Kluwer Health
Published: Jun 1, 1983
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