Inclusion Criteria:

• Man or woman > 18 years of age
• Competent to comprehend, sign, and date an IEC-approved informed consent form
• Histologically or cytologically-confirmed metastatic adenocarcinoma of the colon or rectum.
• Radiographically documented disease progression per modified RECIST criteria either while receiving or ≤ 6 months after the last dose of prior first-line chemotherapy for mCRC
• At least 1 uni-dimensionally measurable lesion of at least 20 mm per modified RECIST criteria.
• If subject has prior history of cancer other than colorectal carcinoma, basal cell carcinoma, or cervical carcinoma in situ, then subject must not have had treatment or active disease within 5 years.
• Prior radiotherapy is acceptable.
• One and only one prior chemotherapy regimen for mCRC consisting of first-line fluoropyrimidine-based chemotherapy.
• ECOG performance status of 0, 1 or 2
• Life expectancy ≥ 3 months
• Hematologic function:ANC > 1.5 x 109/L, Platelet count > 100 x 109/L, Hemoglobin > 10 g/dL
• Renal function: Creatinine < 1.5 mg/dL
• Hepatic function: AST and ALT < 3 x ULN (if liver metastases < 5 x ULN)
• Bilirubin < 2 x ULN

Exclusion Criteria:

• No more than one prior chemotherapy regimen for mCRC consisting of first-line fluoropyrimidine-based chemotherapy. (Prior adjuvant fluoropyrimidine-based chemotherapy is allowed)
• Prior systemic therapy for the treatment of metastatic colorectal carcinoma with the exception of adjuvant fluoropyrimidine-based chemotherapy given at least 6 months prior to enrolment.
• Systemic chemotherapy, hormonal therapy, immunotherapy or experimental or approved proteins/antibodies (eg, bevacizumab) ≤ 30 days before inclusion
• Unresolved toxicities from prior systemic therapy that, in the opinion of the investigator, does not qualify the patient for inclusion
• Central nervous system/brain metastases
• Significant cardiovascular disease including unstable angina or myocardial infarction within 6 months before initiating study treatment or a history of ventricular arrhythmia
• Prior anti-EGFr antibody therapy (eg, cetuximab) or treatment small molecule EGFr tyrosine kinase inhibitors (eg, erlotinib)
• History of interstitial pneumonitis or pulmonary fibrosis or evidence of interstitial pneumonitis or pulmonary fibrosis on baseline chest CT scan
• Treatment for systemic infection within 14 days before initiating study treatment
• Radiotherapy ≤ 14 days prior to inclusion. Patients must have recovered from all radiotherapy-related toxicities
• Active inflammatory bowel disease or other bowel disease causing chronic diarrhoea (defined as > 4 loose stools per day)
• History of Gilbert's syndrome or dihydropyrimidine deficiency
• History of any medical condition that may increase the risks associated with study participation or may interfere with the interpretation of the study results
• Known positive test for human immunodeficiency virus infection, hepatitis C virus, chronic active hepatitis B infection
• subject allergic to the ingredients of the study medication or to Staphylococcus protein A
• Any co-morbid disease that would increase risk of toxicity
• Any kind of disorder that compromises the ability of the subject to give written informed consent and/or comply with the study procedures
• Any investigational agent within 30 days before enrolment
• Must not have had a major surgical procedure within 28 days of randomization
• Subject who is pregnant or breast feeding
• Woman or man of childbearing potential not consenting to use adequate contraceptive precautions i.e. double barrier contraceptive methods
• Subject unwilling or unable to comply with study requirements