Cohort A : patients with suspected colorectal cancer following a positive immunological test during screening (presence of blood detected in the stool) or with gross bleeding OR Cohort B : patients who have already performed colonoscopy (on symptoms, or because of family history, or other ...), for whom the diagnosis of adenocarcinoma was identified by pathology prior to surgery, candidates for surgery on their colorectal tumor
Signed and dated informed consent
Patient affiliated to or beneficiary of French social security system.
You may not be if
Vulnerable persons according to the law (minors, adults under protection, persons deprived of liberty ...)
Not ability to comply with the study protocol, in the Investigator's judgment
pregnant woman
Patient in the period of exclusion of another study
