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The methylation rates were determined. Our results have shown that an increasing amount of cell-free DNA in the group of CRC patient's plasma compared to the healthy group. Moreover, patients with later stages of CRC had higher concentrations of cell-free DNA. Notably, the methylation rate of SHISA3 was higher in the plasma of the CRC group than in that of the healthy group. The results indicated that the presence of tumor cells does not reduce the degree of SHISA3 DNA in the peripheral blood of patients with CRC. In other words, the