NEOADJUVANT THERAPY: Patients receive mFOLFIRINOX comprising oxaliplatin intravenously (IV) over 2 hours, levoleucovorin calcium IV over 2 hours, irinotecan hydrochloride IV over 90 minutes, and fluorouracil IV continuously for 46 hours on day 1. Treatment repeats every 2 weeks for 6 courses in the absence of disease progression or unacceptable toxicity.