Colon cancer overview

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Abstract
The scope of current prevention research support by the National Cancer Institute includes the clinical assessment of dietary modifications and cancer screening trials, epidemiologic studies, development of new chemo-preventive therapies, and the use of advanced molecular biologic technologies to probe the genetic determinants of colorectal adenomas. Colorectal cancer frequently has been associated with high-fat low-fiber diets in epidemiologic and experimental studies. A recently initiated Phase III Dietary Intervention Study of Recurrence of Large Bowel Adenomatous Polyps will investigate the potential benefits of a low-fat high-fiber fruit-and-vegetable-enriched eating pattern to decrease the polyp recurrence rate. The Chemoprevention Program currently is supporting four Phase III controlled clinical intervention trials investigating the cancer-inhibiting effects on colorectal cancer of β-carotene, piroxicam, calcium, and calcium plus fiber in persons with previous adenomas. A proposed early detection trial will screen for colorectal, prostate, lung, and ovarian cancers. A comparison of incidence and mortality trends indicates progress in colorectal cancer detection and therapy.

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