NOTE: The diagnosis must be confirmed by the pathology department at MSKCC. NOTE: It is recognized that newly diagnosed patients may be started on therapy with cytarabine and high-dose mitoxantrone (which is the standard of care at our institution for treating adult ALL) prior to the identification of t(9;22) in leukemic cells. These patients will remain eligible for participation on study and will be evaluable for response if it is possible to start treatment with dasatinib within 30 days of receiving induction chemotherapy.