Dasatinib (BMS-354825) in Subjects With Lymphoid Blast Phase Chronic Myeloid Leukemia or Philadelphia Chromosome Positive Acute Lymphoblastic Leukemia

Inclusion Criteria: * Subjects with Philadelphia chromosome positive (Ph+) (BCR/ABL+) lymphoid blast phase chronic myeloid leukemia whose disease has primary or acquired hematologic resistance to imatinib mesylate or who are intolerant of imatinib mesylate. * Subjects who are considered to have lymphoid blast phase CML if they meet at least one of the following criteria: \*30% lymphoid blasts in peripheral blood or bone marrow. \*Extramedullary infiltrates of leukemic cells (other than in spleen or liver) with peripheral blood lymphoid blast morphology. * ECOG performance status score 0-2. * Adequate hepatic function defined as: \*Total bilirubin less than or equal to 2.0 times the institutional upper limit of normal; \*alanine aminotransferase (ALT) and aspartate aminotransferase (AST) less than or equal to 2.5 times the institutional upper limit of normal. * Adequate renal function defined as: \*serum creatinine less than or equal to 1.5 times the institutional upper normal limit. * Men and women, 18 years of age or older. * Women of childbearing potential (WOCBP) must be using an adequate method of contraception to avoid pregnancy throughout the study and for a period of at least 1 month before and at least 3 months after the study in such a manner that the risk of pregnancy is minimized. WOCBP must have a negative serum or urine pregnancy test (minimum sensitivity 25 IC/L or equivalent units of HCG) within 72 hours prior to the start of study medication. Exclusion Criteria: * WOCBP who are unwilling or unable to use an acceptable method to avoid pregnancy for the entire study period of at least 1 month before and for at least 3 months after completion of the study medication. * WOCBP using a prohibited contraceptive method (not applicable). * Women who are pregnant or breastfeeding. * Women with a positive pregnancy test on enrollment or prior to study drug administration. * Men whose sexual partners are WOCBP, who are unwilling or unable to use an acceptable method to avoid pregnancy of his partner for the entire study period and for at least 3 months after completion of study medication. * Subjects who are eligible and willing to undergo transplantation during the screening period. * A serious uncontrolled medical disorder or active infection that would impair the ability of the subject to receive protocol therapy. * Demential or altered mental status that would prohibit the understanding or rendering of informed consent. * History of significant bleeding disorder unrelated to CML. * Concurrent incurable malignancy other than CML. * Evidence of organ dysfunction or digestive dysfunction that would prevent administration of study therapy. * Subjects who received any of the following: * imatinib mesylate within 7 days; * interferon or cytarabine within 14 days; * a targeted small molecule anti-cancer agent within 14 days; * any other investigational or antineoplastic agent other than hydroxyurea or anagrelide within 28 days before starting treatment with BMS-354825. * Subjects currently taking drugs that are generally accepted to have a risk of causing Torsades de Pointes. * Subjects taking medications that irreversibly inhibit platelet function. * Prior therapy with BMS-354825. * Prisoners or subjects who are compulsorily detained (involuntarily incarcerated) for treatment of either a psychiatric or physical (e.g., infectious disease) illness must not be enrolled into this study.