 Every two week study cycle, you will receive a dose of bevacizumab intravenously through a needle in your vein. The first bevacizumab dose will be given over 90 minutes as a continuous IV infusion. If the first dose is tolerated without any side effects related to the intravenous IV infusion, the second dose may be delivered over 60 minutes. If the 60 minute infusion is tolerated, all doses of bevacizumab after that may be given over 30 minutes. If you experience infusion-related side effects with the 60 minute infusion, all doses after that will be given over 90 minutes. If you experience infusion-related side effects with the 30 minute infusion, all doses after that will be given over 60 minutes. Other drugs, including Tylenol and Benadryl, may be given before, during, and after the therapy to help prevent or ease side effects. These drugs may be given either by mouth or through an IV line. 