Disease-free survival in patients with stage III resected colon cancer is not improved by adding cetuximab to mFOLFOX6 (the modified sixth version of the standard adjuvant therapy [leucovorin, fluorouracil and oxaliplatin]). In this randomized trial, the 3-year disease-free survival for mFOLFOX6 compared with mFOLFOX6 plus cetuximab was 74.6% versus 71.5% for patients with wild-type KRAS and 67.1% versus 65.0% for those with mutated KRAS. Adverse events (grade 3 or higher) were also significantly higher with cetuximab.