An Extension Study to Determine the Safety and Anti-Leukemic Effects of Imatinib Mesylate in Adult Participants With Ph+ Leukemia

Inclusion Criteria:

Male or female participants, aged ≥18 years, with a histologically confirmed diagnosis of Ph+ leukemia of one of the following types:

Accelerated phase chronic myeloid/myelogenous leukemia (CML).
Acute lymphoid/lymphoblastic leukemia (ALL) or acute myeloid/myelogenous leukemia (AML) in first or subsequent relapse after either standard chemotherapy, autologous or allogeneic bone marrow transplantation, or high-dose treatment with peripheral blood stem cell support, or
ALL or AML refractory to standard chemotherapy (no complete remission achieved after two courses of conventional induction chemotherapy).
Lymphoid blastic phase of CML in first or subsequent relapse or refractory to standard chemotherapy.
With serum serum glutamate oxaloacetate transaminase (aspartate aminotransferase) and serum glutamate pyruvate transaminase (alanine aminotransferase) not more than 3 x upper limit of normal (ULN) (or not more than 5xULN if clinically suspected leukemic involvement of the liver), serum creatinine concentration not more than 2xULN, and total serum bilirubin level not more than 3xULN (bilirubin limit was 1.5xULN before protocol amendment 1)

Exclusion Criteria:

Participants who had an Eastern Cooperative Oncology Group (ECOG) performance status score ≥3.
Participants with known leukemic involvement of the central nervous system (CNS).
Participants who had received treatment with any of the following agents: interferon-alpha within 48 hours, hydroxyurea within 24 hours, homoharringtonine within 14 days, low-dose, moderate dose or high dose cytosine arabinoside within 7, 14 or 28 days respectively, 6-mercaptopurine, vinca alkaloids or steroids within 7 days, anthracyclines, mitoxantrone, etoposide, methotrexate, cyclophosphamide within 21 days, or busulfan within 6 weeks.
Participants who had undergone hematopoietic stem cell transplantation within six weeks of Day 1, or who had not achieved full hematopoietic recovery following the transplant.
Participants with grade 3/4 cardiac disease or any serious, concomitant, medical condition.
Participants with a history of non-compliance to medical regimens or who were considered potentially unreliable.

Other protocol-defined inclusion/exclusion criteria may apply.