Despite the growing public awareness and recent progress in multimodality therapy to the colorectal cancer (CRC), CRC still ranks high on the list of the most common and deadly cancers in Taiwan. The cause of CRC mortality is due mainly to the occurrence of distant metastasis. Several reports suggested that circulating tumor cells (CTCs) highly associated with metastasis suggesting that targeting CTCs may offer an unprecedented opportunity to prevent the development of metastasis. Early detection and characterization of CTCs is therefore important as a potential strategy to monitor the progression of CRC. The current proposal is focused on detecting CTCs from peripheral blood of CRC patients using Miselect R system. We will monitor the amount of CTCs and correlate with CRC progression and prognosis.

Inclusion Criteria:

1. Over 20 and less than 90 years of age.
2. Colorectal cancer stage II/III patients who will undergo surgical resection.
3. Subject having agreed to participate in the study and follow the study procedures by providing written informed consent prior entering the study.

Exclusion Criteria:

1. Have other cancer history.
2. Subject being identified with any blood borne infectious disease

200 Colorectal cancer stage II/III patients who will undergo surgical resection