If you are in Arm B, you will take pazopanib by mouth 1 time each day. You will receive trastuzumab by vein on Days 1, 8, 15, and 22 of each cycle. The first infusion will be over 90 minutes. If you handle the infusion well, the next infusions will be over 30 minutes. You should take pazopanib either 1 hour before or 2 hours after eating a meal.