3. are pregnant or breastfeeding. Sexually active women of childbearing potential (WOCBP) must use an effective method of birth control during the course of the study, in a manner such that risk of failure is minimized. Prior to study enrollment, women of childbearing potential must be advised of the importance of avoiding pregnancy during trial participation and the potential risk factors for an unintentional pregnancy. All WOCBP MUST have a negative pregnancy test prior to first receiving dasatinib. If the pregnancy test is positive, the patient must not receive dasatinib and must not be enrolled in the study.