You will take dasatinib by mouth once a day, every day during this study. Your study doctor and research nurse will tell you how many pills you will take. Dasatinib should be taken at the same time each day, with or without meals. If you miss a dose of dasatinib, you should not double the next dose. It is important to take dasatinib with water, and not fruit juices. You should not drink grapefruit juice or eat grapefruit while you are on this study. Dasatinib should not be touched by children, pregnant women, or women who are breastfeeding. If a caregiver must handle the drug, a protective glove should be worn.