You may receive up to 6 cycles of treatment. You will be taken off study if the disease gets worse or intolerable side effects occur. When you stop taking study drug on this study, you will have a physical exam, including measurement of vital signs (temperature, pulse, breathing rate, and blood pressure) and weight. Blood (about 3-4 teaspoons) will be collected for routine tests. A performance status evaluation (a test looking at the ability to perform everyday activities) and a liver function test (about 1-2 teaspoons of blood) will also be done.