If you are assigned to Group 1, the drug will be given over about 1 hour through a peripheral or central catheter every day for 5 days. A peripheral or central venous catheter is a sterile flexible tube that will be placed into a large vein while you are under local anesthesia. Your doctor will explain this procedure to you in more detail, and you will be required to sign a separate consent form for this procedure. You will receive the study drug for 5 days per study "cycle". Each cycle will be about 4-8 weeks. You must receive your study drug at M. D. Anderson Cancer Center.