Leukemia, Lymphocytic, Chronic, B-CellLeukemia, LymphoidPrecursor Cell Lymphoblastic Leukemia-LymphomaLeukemiaLeukemia, Myeloid, AcuteLeukemia, B-CellLeukemic InfiltrationAsparaginaseLeukemia, T-CellLeukemia, Myelogenous, Chronic, BCR-ABL PositiveVidarabinePrecursor B-Cell Lymphoblastic Leukemia-LymphomaLeukemia, Biphenotypic, AcuteB-LymphocytesMethotrexateRemission, SpontaneousBone MarrowLymphocytes, NullGene Expression Regulation, LeukemicCytarabineVincristine6-MercaptopurineImmunoglobulin Heavy ChainsRemission InductionLeukemia, ExperimentalLeukemia-Lymphoma, Adult T-CellAntineoplastic AgentsReceptors, Antigen, B-CellZAP-70 Protein-Tyrosine KinaseBurkitt LymphomaLymphomaPrognosisChlorambucilLeukemia, Hairy CellAntineoplastic Combined Chemotherapy ProtocolsRosette FormationChromosomes, Human, 6-12 and XAnisocoriaKaryotypingPhiladelphia ChromosomeDNA, NeoplasmCorneal PerforationLymphocytesLeukemia Virus, MurineBlast CrisisAcute DiseaseRecurrenceChromosome AberrationsTranslocation, GeneticCladribineAntigens, NeoplasmTumor Cells, CulturedAntigens, CD5DNA NucleotidylexotransferaseT-LymphocytesTreatment OutcomeCyclophosphamideAntigens, CD38Leukemia, MyeloidFusion Proteins, bcr-ablChild WelfareAntibodies, MonoclonalImmunoglobulin Variable RegionDrug Resistance, NeoplasmChromosomes, Human, Pair 14NeprilysinFlow CytometryNeoplasm ProteinsDaunorubicinBone Marrow TransplantationDisabled ChildrenPrednisoneAntigens, SurfaceMutationChild BehaviorBase SequenceTime FactorsSurvival AnalysisLeukemia, Prolymphocytic, T-CellCyclin-Dependent Kinase Inhibitor p15Drug Administration SchedulePolymerase Chain ReactionMolecular Sequence DataLeukemia, Monocytic, AcuteAntibodies, Monoclonal, Murine-DerivedDexamethasoneSurvival RateImmunophenotypingChromosomes, Human, Pair 9Leukemia, Large Granular LymphocyticSalvage TherapyChromosomes, Human, Pair 13Leukemia L1210Moloney murine leukemia virusAntibodies, NeoplasmRisk FactorsApoptosisHematologic NeoplasmsCell Transformation, NeoplasticGenes, Immunoglobulin Heavy Chain