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“Background Colorectal Cytidine deaminase cancer (CRC) is one of the most common causes of cancer death throughout the world. Multistage development of the disease has been associated with remarkable genetic events, mainly at the level of oncogenes and oncosuppressor genes, most notably the adenomatous polyposis coli gene (APC) , ras [2, 3], and p53 . Although great advances have been made during the last few decades in understanding the molecular biology of colorectal cancer , the prognosis of patients with this neoplasm has not improved in parallel. The overall five-year survival rate remains poor (40–45%) . It can be assumed that several genes involved in the pathogenesis of colorectal cancer are still unknown.