Abstract
Early diagnosis and prompt treatment are mandatory to prevent colorectal cancer. Detection of free circulating tumor DNA in the serum of the cancer patients provides new possibilities for cancer diagnosis. Several circulating colorectal cancer DNAs have been identified by PCR detection such as the activated K-ras oncogene, inactivated APC, p53 genes, and microsatellite instability (MSI). Circulating tumor DNA was predominantly found in patients with advanced disease and poor prognosis. It was suggested that analysis for circulating tumor DNA might be useful in early diagnosis.
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