Patients receiving Vectibix in combination with the IFL regimen [bolus 5-fluorouracil (500 mg/ m2), leucovorin (20 mg/ m2) and irinotecan (125 mg/ m2)] experienced a high incidence of severe diarrhoea (see section 4.8), therefore administration of Vectibix in combination with IFL should be avoided (see section 4.5).