During the systemic chemotherapy phase, you will receive mFolfirinox 1 time every 2 weeks (Weeks 1, 3, 5, 7, 9 and 11) for 12 weeks. You will receive oxaliplatin by vein over a 2-hour period. After receiving oxaliplatin, you will receive irinotecan by vein over a 90-minute period. After receiving irinotecan, you will then receive 5-FU through a portable pump for the next 46 hours. You will take the portable pump home with you and will receive instructions on how to use it.