 Trastuzumab will be administered as an 8 mgkg loading dose by intravenous IV infusion over 90 minutes on day 1 of cycle 1. Subsequent doses will be administered as a 6 mgkg IV dose over 30 minutes. Oxaliplatin will be administered at a dose of 130 mg m2 over 120 minutes on day 1 of each cycle, following standard antiemetic premedications. 21 day cycles. 