Participants who enroll in this study will receive with anti-leukemia drugs called chemotherapy. During study treatment, the study doctors will continue to perform tests on blood, bone marrow and spinal fluid to assess how the disease is responding to the study treatment and to look for possible side effects. Scans (for example, x-ray, CT scan or MRI scan) may also be done after beginning study treatment to look for possible side effects. If the disease was initially diagnosed by a scan, it will also be repeated during the study treatment to assess how it is responding.