 ARM I: Patients receive oxaliplatin intravenously IV over 2 hours and irinotecan hydrochloride IV over 90 minutes on days 1 and 15. Patients also receive fluorouracil IV over 46 hours on days 1-3 and 15-17. Treatment repeats every 28 days for 3 courses in the absence of disease progression or unacceptable toxicity. Patients achieving stable disease or better undergo pancreatectomy 4-8 weeks after completion of first 3 courses of treatment. Within 4-8 weeks following pancreatectomy, patients receive an additional 3 courses of oxaliplatin, irinotecan hydrochloride, and fluorouracil treatment in the absence of disease progression or unacceptable toxicity. 