OUTLINE: Patients receive trastuzumab (Herceptin) IV over 30-90 minutes on days 1, 8, 15, and 22, followed by oxaliplatin IV over 2 hours on days 1 and 15, and then followed by leucovorin calcium IV over 2 hours on days 1, 8, and 15. Fluorouracil IV is administered at the midpoint of the leucovorin calcium infusion on days 1, 8, and 15. Treatment continues every 28 days in the absence of unacceptable toxicity or disease progression.