 Patients receive carbon C 14 oxaliplatin microdose intravenously IV over 120 minutes. Beginning not more than 4 weeks after the initial carbon C 14 oxaliplatin microdose administration, patients receive FOLFOX comprised of leucovorin calcium IV, fluorouracil IV over 2 hours over 46-48 hours via ambulatory infusion pump on days 1 and 2, and oxaliplatin contain carbon C 14 microdose course I only IV over 2 hours on day 1. Courses repeat every 14 days in the absence of disease progression or unacceptable toxicity. 