You will continue to receive the chemotherapy once every 28 days, unless the disease gets worse or intolerable side effects occur. Every 2 months and at the end of your participation in this study, you will have scans to see if your tumors are growing or shrinking and blood work (about 3 teaspoons) will be performed for safety tests. These tests can be performed at your doctor's office and the results faxed to the study doctor at M. D. Anderson.