الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Colorectal cancers rank third in frequency in men and second in women. Male incidence rates, adjusted for age and race, appear greater than female rates for both proximal and distal cancers .Globally, the age-standardized incidence rate (ASR) of colorectal cancer is 20.1 per 100,000 males and 14.6 per 100,000 females.
Epidemiologic factors have provided initial evidence about the specific factors that initiate the process of carcinogenesis in the large bowel mucosa. Chief among the factors that can initiate colorectal cancer development are a predisposition to mutagen effects, fecal mutagens, meat intake, bile acids, altered vitamin and mineral intake.
In this study we aimed at prediction of colorectal risk factors generally. The study was done with two parts, retrospective part and prospective part. We collected 522 patients in the retrospective part and 27 patients in the prospective part. All patients involved in this study completed a questionnaire designed by the researcher which include personal history, complaint (presenting symptom) present history, dietary history, past history, family history and final diagnosis.
Data obtained had been processed and results are concluded in the form of tables and graphs. The results found that old age high fat, low fiber diet, smoking. Inflammatory bowel disease, first degree relative and familial adenomatous polyposis are the most important risk factors for colo rectal cancer
from this study we recommended that the government should launch a wide health education program to increase the awareness about risk factors and a national screening program for early detection of colorectal cancers.