Patients receive cetuximab IV over 1-2 hours on days 1 and 8. Patients also receive FOLFIRINOX chemotherapy comprising oxaliplatin IV over 2 hours, irinotecan hydrochloride IV over 30-90 minutes, and leucovorin calcium IV over 2 hours on day 1 and fluorouracil IV continuously over 46 hours on days 1 and 2. Treatment repeats every 15 days for up to 12 courses in the absence of disease progression or unacceptable toxicity.