Blood test may predict when colorectal cancer treatment fails

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: 1. Age ≥ 18 years old 2. Male or female 3. ECOG performance status ≤2 4. Must have histologically or cytologically verified colorectal cancer adenocarcinoma 5. Inoperable locally advanced or metastatic disease 6. Presence of measurable disease (by RECIST criteria version 1.1) on baseline CT scan of the thorax/abdomen/pelvis or CT scan of the thorax and MRI of the abdomen/pelvis 7. At least two prior systemic treatments for advanced/metastatic colorectal cancer including oxaliplatin and irinotecan-based therapy (adjuvant or neoadjuvant systemic chemotherapy will be considered if tumour progression was documented within 6 month of the last chemotherapy dose) 8. Candidate for standard third-line or subsequent lines of therapy as per decision of the treating physician 9. Life expectancy of at least 3 months 10. Women of childbearing potential must have a negative serum pregnancy test done within 28 days prior to enrolment. 11. Effective contraception is in place for women of childbearing potential. 12. Completion of all necessary screening procedures within 28 days prior to enrolment. 13. Availability of archived tumour tissue 14. Signed Informed Consent form (ICF) obtained prior to any study related procedure. Inclusion criterion applicable to FRANCE only 15. Affiliated to the French Social Security System Exclusion Criteria: 1. Tumours other than colorectal cancer 2. Histologies other than adenocarcinoma 3. Any baseline medical condition that would contraindicate the use of systemic chemotherapy or may preclude the regular administration of the same 4. Any psychiatric condition that would prohibit the understanding or rendering of informed consent 5. Other invasive malignancy within 3 years except for non-invasive malignancies such as cervical carcinoma in situ, non-melanomatous carcinoma of the skin or ductal carcinoma in situ of the breast that has/have been surgically cured 6. Subject with a significant medical, neuro-psychiatric, or surgical condition, currently uncontrolled by treatment, which, in the principal investigator's opinion, may interfere with completion of the study. 7. Pregnant and/ or lactating women Exclusion criterion applicable to FRANCE only 8. Vulnerable persons according to the article L.1121-6 of the Public Health Code, adults who are the subject of a measure of legal protection or unable to express their consent according to article L.1121-8 of the Public Health Code.