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Abstract
Colorectal cancer is a curable disease if detected and treated early. Screening may decrease the morbidity and mortality rates associated with colorectal cancer by enabling detection and removal of premalignant adenomatous polyps before they become invasive cancers however colorectal cancer is considered one of the most common malignant tumors allover the world and one of the leading causes of death. Its highest incidence is found in advanced countries, and its lowest incidence is found in developing countries.