Low-Dose or High-Dose Vincristine and Combination Chemotherapy in Treating Young Patients With Relapsed B-Cell Acute Lymphoblastic Leukemia

Combination Chemotherapy in Treating Young Patients With Newly Diagnosed Acute Promyelocytic Leukemia

Cyclophosphamide and Prednisone With or Without Immunoglobulin in Treating Abnormal Muscle Movement in Children With Neuroblastoma

Combination Chemotherapy and Radiation Therapy in Treating Patients With Newly Diagnosed Rhabdomyosarcoma

Collecting and Storing Samples of Bone Marrow and Blood From Patients With Relapsed Acute Lymphoblastic Leukemia or Non-Hodgkin Lymphoma

Collecting and Storing Samples of Blood and Tumor Tissue From Patients With Osteosarcoma

Combination Chemotherapy, Radiation Therapy, and an Autologous Peripheral Blood Stem Cell Transplant in Treating Young Patients With Atypical Teratoid/Rhabdoid Tumor of the Central Nervous System

Collecting and Storing Biological Samples From Young Patients With Hodgkin's Lymphoma

Collecting and Storing Tissue Samples From Patients With Rare or Cutaneous Non-Hodgkin Lymphoma

Study to Assess Compliance With Long-Term Mercaptopurine Treatment in Young Patients With Acute Lymphoblastic Leukemia in Remission

Study of Blood Samples From Newborns With Down Syndrome

Tamoxifen Citrate in Treating Patients With Metastatic or Recurrent Breast Cancer

Combination Chemotherapy and Radiation Therapy in Treating Patients With Acute Lymphoblastic Leukemia That Has Relapsed in the CNS or Testes

Radiation Therapy, Temozolomide, and Lomustine in Treating Young Patients With Newly Diagnosed Gliomas

Surgery in Treating Children With Neuroblastoma

Combination Chemotherapy With or Without Gemtuzumab in Treating Young Patients With Newly Diagnosed Acute Myeloid Leukemia

Radiation Therapy in Treating Young Patients With Gliomas

Comparison of Radiation Therapy Regimens in Combination With Chemotherapy in Treating Young Patients With Newly Diagnosed Standard-Risk Medulloblastoma

Comparison of Different Combination Chemotherapy Regimens in Treating Children With Acute Lymphoblastic Leukemia