Prospective research of circulating tumor cells as markers of progression risk in colorectal cancer.

This study aims at allowing a better understanding of which circulating tumor cells (CTC) have the higher risk of metastasis of in the overall population of CTC.

Prospective monocenter open-label study.

In the frame of the management of the disease, blood samples will be collected at different times of treatment, regarding disease status (localized of stage II/III, metastatic non resectable, metastatic potentially resectable). Tissue samples will be collected for patients scheduled for surgery.

Inclusion Criteria:

1. Patient of more than 18 years old
2. Histological diagnosis of colic adenocarcinoma metastatic or not
3. Before any treatment with systemic chemotherapy
4. Patient affiliated to, or beneficiating of the national security
5. Patient having signed informed consent

Exclusion Criteria:

1. Patient with previous chemothrapy treatment
2. Patient with more than one evolutive tumoral pathology
3. Patient under long-term immunosuppressor treatment
4. Patient with severe infection
5. Pregnant or breasting woman
6. Person in an emergency situation, adult subject to a legal protection measure (a guardian, guardianship or safeguard of justice), or unable of expressing his / her consent.