MethotrexatePolyglutamic AcidAntirheumatic AgentsFolic Acid AntagonistsTetrahydrofolate DehydrogenaseArthritis, RheumatoidAminopterinAntimetabolites, AntineoplasticLeukemia L1210Reduced Folate Carrier ProteinTrimetrexateFolic AcidModels, BiologicalDrug Therapy, Combinationgamma-Glutamyl HydrolaseLeucovorinTetrahydrofolatesTreatment OutcomeDrug ResistanceCyclophosphamideAbortifacient Agents, NonsteroidalImmunosuppressive AgentsAntineoplastic Combined Chemotherapy ProtocolsSulfasalazinePrecursor Cell Lymphoblastic Leukemia-LymphomaDrug Administration ScheduleVincristineDeoxyuridineBiological ProductsDermatologic Agents6-MercaptopurinePregnancy, EctopicFluorouracilDose-Response Relationship, DrugFormyltetrahydrofolatesFolate Receptors, GPI-AnchoredBiological TransportBiological TherapyDoxorubicinOsteosarcomaPhosphoribosylaminoimidazolecarboxamide FormyltransferaseTime FactorsPrednisoneInjections, SpinalCytarabineThymidylate SynthaseLeukemia, LymphoidPsoriasisCentral Nervous System NeoplasmsHydroxychloroquineSarcoma 180Pregnancy, TubalBiological AssayIsoxazolesAntibodies, MonoclonalPteroylpolyglutamic AcidsKineticsCell LineAsparaginaseMolecular Sequence DataRemission InductionGestational Trophoblastic DiseaseHydroxymethyl and Formyl TransferasesBiological MarkersProbenecidAntineoplastic AgentsBreast NeoplasmsMucositisCarcinoma, Ehrlich TumorArthritis, PsoriaticCombined Modality TherapyDouble-Blind MethodArthritis, JuvenileAdministration, OralBiological WarfareAmino Acid SequenceNucleotide DeaminasesVinblastineReceptors, Tumor Necrosis FactorLeukemia L5178Survival AnalysisCell SurvivalTrophoblastic NeoplasmsCisplatinSeverity of Illness IndexBiological ProcessesAlgorithmsCells, CulturedTumor Cells, CulturedStructure-Activity RelationshipAnti-Inflammatory AgentsGene Expression ProfilingCell DivisionHypoxanthinesLymphomaCarrier ProteinsDisease-Free SurvivalNeoplasms