MethotrexatePolyglutamic AcidAntirheumatic AgentsFolic Acid AntagonistsToxicity TestsTetrahydrofolate DehydrogenaseAntimetabolites, AntineoplasticArthritis, RheumatoidAminopterinLeukemia L1210Antineoplastic Combined Chemotherapy ProtocolsReduced Folate Carrier ProteinDrug Administration ScheduleTrimetrexateTreatment OutcomeLeucovorinCyclophosphamideDose-Response Relationship, DrugDrug Therapy, CombinationFolic AcidToxicity Tests, Acutegamma-Glutamyl HydrolaseFluorouracilDrug ResistanceTetrahydrofolatesVincristineAbortifacient Agents, NonsteroidalImmunosuppressive AgentsDoxorubicinPrecursor Cell Lymphoblastic Leukemia-LymphomaSulfasalazineDeoxyuridine6-MercaptopurineAntineoplastic AgentsDermatologic AgentsPregnancy, EctopicCisplatinFormyltetrahydrofolatesPrednisoneCytarabineCombined Modality TherapyAdministration, OralFolate Receptors, GPI-AnchoredTime FactorsRemission InductionThymidylate SynthaseLethal Dose 50OsteosarcomaHydroxychloroquineInfusions, IntravenousInjections, SpinalCentral Nervous System NeoplasmsPhosphoribosylaminoimidazolecarboxamide FormyltransferaseVinblastineLeukemia, LymphoidCell SurvivalSurvival AnalysisMucositisSarcoma 180Antibodies, MonoclonalAsparaginaseIsoxazolesPregnancy, TubalDisease-Free SurvivalBiological TransportPteroylpolyglutamic AcidsPsoriasisDrug EvaluationGestational Trophoblastic DiseaseEtoposideToxicity Tests, ChronicAntidotesBreast NeoplasmsLeukopeniaHydroxymethyl and Formyl TransferasesDrug InteractionsProbenecidNeoplasmsDouble-Blind MethodSurvival RateChemotherapy, AdjuvantCarcinoma, Ehrlich TumorKineticsLiverInfusions, ParenteralNucleotide DeaminasesCell LineBleomycinIfosfamideFollow-Up StudiesDrug-Induced Liver InjuryLymphoma, Non-HodgkinNauseaCyclosporineArthritis, JuvenileInjections, IntravenousArthritis, PsoriaticLymphomaTrophoblastic NeoplasmsFloxuridine