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Background: This two-part phase Ib/II study investigated the feasibility of administering cetuximab in combination with oxaliplatin and infusional 5-fluorouracil (5-FU)/folinic acid (FA) in a weekly schedule (AIO FUFOX protocol) as first-line treatment in patients with epidermal growth factor receptor-detectable advanced colorectal cancer. Patients and methods: Cetuximab was administered weekly: 400 mg/m2 initial dose, then 250 mg/m2 and FUFOX: oxaliplatin 50 mg/m2, FA 500 mg/m2 and 5-FU as a 24-h infusion at either 1500 or 2000 mg/m2 administered for 4 weeks followed by a 1-week rest (one cycle). Results: Dose-limiting toxicity (grade 3 diarrhea) occurred in 3 of 14 assessable patients receiving 5-FU at standard 2000 mg/m2. This dose was administered to a further 25 patients. Cetuximab combined with FUFOX was generally well tolerated with the most common grade 3/4 adverse events being diarrhea (27%) and paresthesia (16%). The confirmed response rate for patients receiving 5-FU at standard 2000 mg/m2 (N = 41) was 56%, with a median duration of 9.3 months. Median progression-free and overall survival times including all 49 patients were 8.1 (95% confidence interval 6.0–9.7) and 28.2 months, respectively. Cetuximab pharmacokinetics seemed not to be different for combination with FUFOX compared with cetuximab/irinotecan combinations. Conclusion: This protocol is well tolerated and shows promising efficacy supporting further investigation. [ABSTRACT FROM AUTHOR]