Prognostic Factors for Patients With Advanced Colorectal Cancer Treated With Cetuximab.

Pts meeting eligibility criteria will be registered, providing the availability of material for molecular analysis. Tumour specimens and blood sample will be collected to perform genomic, ICH and proteomic analyses in order to identify the molecular characteristics of tumour.

After the availability of KRAS evaluation, only the data of KRAS wild-type pts will be collected.

Access to registration system will be allowed via web.

Patients,KRAS wild-type receive:

• Cetuximab+FOLFIRI: cetuximab 500 mg/ m² starting dose, following everytwo- week doses of 500 mg/ m², given d1, followed after 1 hour by FOLFIRI: irinotecan 180 mg/m2 on day 1 with LV 100 mg/m2 administered as a 2-hour infusion before FU 400 mg/m2 administered as an intravenous bolus injection, and FU 600 mg/m2 as a 22-hour infusion immediately after FU bolus injection on days 1 and 2

Inclusion criteria

• Signed written informed consent for biological analysis (all pts)
• Signed written informed consent for enrolment (pts with KRAS wild type)
• Male or female aged > or = 18 years
• Diagnosis of histologically confirmed adenocarcinoma of the colon or rectum
• KRAS evaluation availability with wild-type result
• Metastatic CRC not suitable for curative-intent resection
• Availability of tumour samples (or able and willing to provide tumour sample) and blood for biological analysis
• Presence of at least one lesion measurable unidimensionally by computed tomography (CT) scan or magnetic resonance imaging (MRI). (index lesion(s) must not lie within an irradiated area)
• Eastern cooperative oncology group-performance status (ECOG-PS) <2

Exclusion criteria

• Brain metastasis (known or suspected)
• Previous chemotherapy for metastatic CRC (any). Adjuvant therapy is allowed if the chemotherapy treatment free interval is > 6 months
• Surgery (excluding diagnostic biopsy) or irradiation within 4 weeks prior to study entry
• Concurrent chronic systemic immune therapy, chemotherapy, or hormone therapy not indicated in the study protocol
• Any investigational agent(s) within 4 weeks prior to entry
• Previous exposure to HER-axis -pathway targeting therapy
• Leucocytes <3.0 x 109/L and neutrophils <1.5 x 109/L, platelets <100 x 109/L, and hemoglobin <9 g/dL
• Bilirubin level either normal or >1.5 x ULN
• ASAT and ALAT >2.5 x ULN (>5 x ULN if liver metastasis are present)
• Serum creatinine >1.5 x ULN
• Clinically relevant coronary artery disease or a history of a myocardial infarction within the last 12 months
• Acute or sub-acute intestinal occlusion or history of inflammatory bowel disease
• Pre-existing neuropathy > grade 1
• Known grade 3 or 4 allergic reaction to any of the components of the treatment
• Any concurrent malignancy other than non-melanoma skin cancer, or carcinoma in situ of the cervix. (Pts with a previous malignancy but without evidence of disease for > or equal 5 years will be allowed to enter the trial)
• Pregnancy or lactation
• Inadequate contraception (male or female pts) if of childbearing or procreational potential
• Known drug abuse/ alcohol abuse
• Legal incapacity or limited legal capacity
• Medical or psychological condition which in the opinion of the investigator would not permit the patient to complete the study or sign meaningful informed consent